[{"oa":"1","quality_controlled":"1","citation":{"ieee":"M. Zahn <i>et al.</i>, “Equivalent-circuit model that quantitatively describes domain-wall conductivity in ferroelectric lithium ,” <i>Physical Review Applied</i>, vol. 21, no. 2, Art. no. 024007, 2024, doi: <a href=\"https://doi.org/10.1103/physrevapplied.21.024007\">10.1103/physrevapplied.21.024007</a>.","mla":"Zahn, Manuel, et al. “Equivalent-Circuit Model That Quantitatively Describes Domain-Wall Conductivity in Ferroelectric Lithium .” <i>Physical Review Applied</i>, vol. 21, no. 2, 024007, American Physical Society (APS), 2024, doi:<a href=\"https://doi.org/10.1103/physrevapplied.21.024007\">10.1103/physrevapplied.21.024007</a>.","apa":"Zahn, M., Beyreuther, E., Kiseleva, I., Lotfy, A. S., McCluskey, C. J., Maguire, J. R., Suna, A., Rüsing, M., Gregg, J. M., &#38; Eng, L. M. (2024). Equivalent-circuit model that quantitatively describes domain-wall conductivity in ferroelectric lithium . <i>Physical Review Applied</i>, <i>21</i>(2), Article 024007. <a href=\"https://doi.org/10.1103/physrevapplied.21.024007\">https://doi.org/10.1103/physrevapplied.21.024007</a>","bibtex":"@article{Zahn_Beyreuther_Kiseleva_Lotfy_McCluskey_Maguire_Suna_Rüsing_Gregg_Eng_2024, title={Equivalent-circuit model that quantitatively describes domain-wall conductivity in ferroelectric lithium }, volume={21}, DOI={<a href=\"https://doi.org/10.1103/physrevapplied.21.024007\">10.1103/physrevapplied.21.024007</a>}, number={2024007}, journal={Physical Review Applied}, publisher={American Physical Society (APS)}, author={Zahn, Manuel and Beyreuther, Elke and Kiseleva, Iuliia and Lotfy, Ahmed Samir and McCluskey, Conor J. and Maguire, Jesi R. and Suna, Ahmet and Rüsing, Michael and Gregg, J. Marty and Eng, Lukas M.}, year={2024} }","chicago":"Zahn, Manuel, Elke Beyreuther, Iuliia Kiseleva, Ahmed Samir Lotfy, Conor J. McCluskey, Jesi R. Maguire, Ahmet Suna, Michael Rüsing, J. Marty Gregg, and Lukas M. Eng. “Equivalent-Circuit Model That Quantitatively Describes Domain-Wall Conductivity in Ferroelectric Lithium .” <i>Physical Review Applied</i> 21, no. 2 (2024). <a href=\"https://doi.org/10.1103/physrevapplied.21.024007\">https://doi.org/10.1103/physrevapplied.21.024007</a>.","ama":"Zahn M, Beyreuther E, Kiseleva I, et al. Equivalent-circuit model that quantitatively describes domain-wall conductivity in ferroelectric lithium . <i>Physical Review Applied</i>. 2024;21(2). doi:<a href=\"https://doi.org/10.1103/physrevapplied.21.024007\">10.1103/physrevapplied.21.024007</a>","short":"M. Zahn, E. Beyreuther, I. Kiseleva, A.S. Lotfy, C.J. McCluskey, J.R. Maguire, A. Suna, M. Rüsing, J.M. Gregg, L.M. Eng, Physical Review Applied 21 (2024)."},"volume":21,"user_id":"22501","publisher":"American Physical Society (APS)","_id":"51156","status":"public","department":[{"_id":"15"},{"_id":"169"},{"_id":"623"},{"_id":"288"}],"keyword":["General Physics and Astronomy"],"type":"journal_article","date_created":"2024-02-06T08:02:15Z","abstract":[{"lang":"eng","text":"Ferroelectric domain wall (DW) conductivity (DWC) can be attributed to two separate mechanisms: (a) the injection/ejection of charge carriers across the Schottky barrier formed at the (metal-)electrode-DW junction and (b) the transport of those charge carriers along the DW. Current-voltage (I-U) characteristics, recorded at variable temperatures from LiNbO3 (LNO) DWs, are clearly able to differentiate between these two contributions. Practically, they allow us to directly quantify the physical parameters relevant to the two mechanisms (a) and (b) mentioned above. These are, for example, the resistance of the DW, the saturation current, the ideality factor, and the Schottky barrier height of the electrode-DW junction. Furthermore, the activation energies needed to initiate the thermally activated electronic transport along the DWs can be extracted. In addition, we show that electronic transport along LNO DWs can be elegantly viewed and interpreted in an adapted semiconductor picture based on a double-diode, double-resistor equivalent-circuit model, the R2D2 model. Finally, our R2D2 model was checked for its universality by successfully fitting the I-U curves of not only z-cut LNO bulk DWs, but equally of z-cut thin-film LNO DWs, and of x-cut thin-film DWs as reported in literature."}],"publication":"Physical Review Applied","issue":"2","doi":"10.1103/physrevapplied.21.024007","language":[{"iso":"eng"}],"article_number":"024007","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2307.10322"}],"article_type":"original","intvolume":"        21","publication_status":"published","date_updated":"2024-02-06T08:08:09Z","author":[{"last_name":"Zahn","first_name":"Manuel","full_name":"Zahn, Manuel"},{"full_name":"Beyreuther, Elke","last_name":"Beyreuther","first_name":"Elke"},{"full_name":"Kiseleva, Iuliia","first_name":"Iuliia","last_name":"Kiseleva"},{"first_name":"Ahmed Samir","last_name":"Lotfy","full_name":"Lotfy, Ahmed Samir"},{"full_name":"McCluskey, Conor J.","first_name":"Conor J.","last_name":"McCluskey"},{"full_name":"Maguire, Jesi R.","last_name":"Maguire","first_name":"Jesi R."},{"full_name":"Suna, Ahmet","first_name":"Ahmet","last_name":"Suna"},{"id":"22501","full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","first_name":"Michael","last_name":"Rüsing"},{"last_name":"Gregg","first_name":"J. Marty","full_name":"Gregg, J. Marty"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."}],"publication_identifier":{"issn":["2331-7019"]},"year":"2024","title":"Equivalent-circuit model that quantitatively describes domain-wall conductivity in ferroelectric lithium "},{"_id":"51339","publisher":"Optica Publishing Group","language":[{"iso":"eng"}],"doi":"10.1364/oe.510319","user_id":"216","publication_identifier":{"issn":["1094-4087"]},"author":[{"full_name":"Babai-Hemati, Jonas","first_name":"Jonas","last_name":"Babai-Hemati"},{"id":"71245","first_name":"Felix","last_name":"vom Bruch","full_name":"vom Bruch, Felix"},{"full_name":"Herrmann, Harald","first_name":"Harald","last_name":"Herrmann","id":"216"},{"id":"26263","first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine"}],"year":"2024","status":"public","title":"Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters","date_updated":"2024-02-13T13:09:51Z","publication_status":"published","date_created":"2024-02-13T13:03:01Z","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"keyword":["Atomic and Molecular Physics","and Optics"],"type":"journal_article","citation":{"bibtex":"@article{Babai-Hemati_vom Bruch_Herrmann_Silberhorn_2024, title={Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters}, DOI={<a href=\"https://doi.org/10.1364/oe.510319\">10.1364/oe.510319</a>}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Babai-Hemati, Jonas and vom Bruch, Felix and Herrmann, Harald and Silberhorn, Christine}, year={2024} }","ama":"Babai-Hemati J, vom Bruch F, Herrmann H, Silberhorn C. Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters. <i>Optics Express</i>. Published online 2024. doi:<a href=\"https://doi.org/10.1364/oe.510319\">10.1364/oe.510319</a>","mla":"Babai-Hemati, Jonas, et al. “Tailored Second Harmonic Generation InTi-Diffused PPLN Waveguides Usingmicro-Heaters.” <i>Optics Express</i>, Optica Publishing Group, 2024, doi:<a href=\"https://doi.org/10.1364/oe.510319\">10.1364/oe.510319</a>.","chicago":"Babai-Hemati, Jonas, Felix vom Bruch, Harald Herrmann, and Christine Silberhorn. “Tailored Second Harmonic Generation InTi-Diffused PPLN Waveguides Usingmicro-Heaters.” <i>Optics Express</i>, 2024. <a href=\"https://doi.org/10.1364/oe.510319\">https://doi.org/10.1364/oe.510319</a>.","short":"J. Babai-Hemati, F. vom Bruch, H. Herrmann, C. Silberhorn, Optics Express (2024).","ieee":"J. Babai-Hemati, F. vom Bruch, H. Herrmann, and C. Silberhorn, “Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters,” <i>Optics Express</i>, 2024, doi: <a href=\"https://doi.org/10.1364/oe.510319\">10.1364/oe.510319</a>.","apa":"Babai-Hemati, J., vom Bruch, F., Herrmann, H., &#38; Silberhorn, C. (2024). Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters. <i>Optics Express</i>. <a href=\"https://doi.org/10.1364/oe.510319\">https://doi.org/10.1364/oe.510319</a>"},"publication":"Optics Express","project":[{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","grant_number":"PROFILNRW-2020-067","_id":"266"}]},{"department":[{"_id":"15"},{"_id":"230"},{"_id":"289"},{"_id":"623"}],"oa":"1","keyword":["Electrical and Electronic Engineering","Atomic and Molecular Physics","and Optics","Electronic","Optical and Magnetic Materials"],"type":"journal_article","date_created":"2024-02-20T06:58:48Z","citation":{"mla":"Cui, Tie Jun, et al. “Roadmap on Electromagnetic Metamaterials and Metasurfaces.” <i>Journal of Physics: Photonics</i>, IOP Publishing, 2024, doi:<a href=\"https://doi.org/10.1088/2515-7647/ad1a3b\">10.1088/2515-7647/ad1a3b</a>.","ama":"Cui TJ, Zhang S, Alu A, et al. Roadmap on electromagnetic metamaterials and metasurfaces. <i>Journal of Physics: Photonics</i>. Published online 2024. doi:<a href=\"https://doi.org/10.1088/2515-7647/ad1a3b\">10.1088/2515-7647/ad1a3b</a>","bibtex":"@article{Cui_Zhang_Alu_Wegener_Pendry_Luo_Lai_Wang_Lin_Chen_et al._2024, title={Roadmap on electromagnetic metamaterials and metasurfaces}, DOI={<a href=\"https://doi.org/10.1088/2515-7647/ad1a3b\">10.1088/2515-7647/ad1a3b</a>}, journal={Journal of Physics: Photonics}, publisher={IOP Publishing}, author={Cui, Tie Jun and Zhang, Shuang and Alu, Andrea and Wegener, Martin and Pendry, John and Luo, Jie and Lai, Yun and Wang, Zuojia and Lin, Xiao and Chen, Hongsheng and et al.}, year={2024} }","apa":"Cui, T. J., Zhang, S., Alu, A., Wegener, M., Pendry, J., Luo, J., Lai, Y., Wang, Z., Lin, X., Chen, H., Chen, P., Wu, R.-X., Yin, Y., Zhao, P., Chen, H., Li, Y., Zhou, Z., Engheta, N., Asadchy, V. S., … Di Renzo, M. (2024). Roadmap on electromagnetic metamaterials and metasurfaces. <i>Journal of Physics: Photonics</i>. <a href=\"https://doi.org/10.1088/2515-7647/ad1a3b\">https://doi.org/10.1088/2515-7647/ad1a3b</a>","ieee":"T. J. Cui <i>et al.</i>, “Roadmap on electromagnetic metamaterials and metasurfaces,” <i>Journal of Physics: Photonics</i>, 2024, doi: <a href=\"https://doi.org/10.1088/2515-7647/ad1a3b\">10.1088/2515-7647/ad1a3b</a>.","short":"T.J. Cui, S. Zhang, A. Alu, M. Wegener, J. Pendry, J. Luo, Y. Lai, Z. Wang, X. Lin, H. Chen, P. Chen, R.-X. Wu, Y. Yin, P. Zhao, H. Chen, Y. Li, Z. Zhou, N. Engheta, V.S. Asadchy, C. Simovski, S.A. Tretyakov, B. Yang, S.D. Campbell, Y. Hao, D.H. Werner, S. Sun, L. Zhou, S. Xu, H.-B. Sun, Z. Zhou, Z. Li, G. Zheng, X. Chen, T. Li, S.-N. Zhu, J. Zhou, J. Zhao, Z. Liu, Y. Zhang, Q. Zhang, M. Gu, S. Xiao, Y. Liu, X. Zhang, Y. Tang, G. Li, T. Zentgraf, K. Koshelev, Y.S. Kivshar, X. Li, T. Badloe, L. Huang, J. Rho, S. Wang, D.P. Tsai, A.Yu. Bykov, A.V. Krasavin, A.V. Zayats, C. McDonnell, T. Ellenbogen, X. Luo, M. Pu, F.J. Garcia-Vidal, L. Liu, Z. Li, W. Tang, H.F. Ma, J. Zhang, Y. Luo, X. Zhang, H.C. Zhang, P.H. He, L.P. Zhang, X. Wan, H. Wu, S. Liu, W.X. Jiang, X.G. Zhang, C. Qiu, Q. Ma, C. Liu, L. Li, J. Han, L. Li, M. Cotrufo, C. Caloz, Z.-L. Deck-Léger, A. Bahrami, O. Céspedes, E. Galiffi, P.A. Huidobro, Q. Cheng, J.Y. Dai, J.C. Ke, L. Zhang, V. Galdi, M. Di Renzo, Journal of Physics: Photonics (2024).","chicago":"Cui, Tie Jun, Shuang Zhang, Andrea Alu, Martin Wegener, John Pendry, Jie Luo, Yun Lai, et al. “Roadmap on Electromagnetic Metamaterials and Metasurfaces.” <i>Journal of Physics: Photonics</i>, 2024. <a href=\"https://doi.org/10.1088/2515-7647/ad1a3b\">https://doi.org/10.1088/2515-7647/ad1a3b</a>."},"publication":"Journal of Physics: Photonics","user_id":"30525","doi":"10.1088/2515-7647/ad1a3b","publisher":"IOP Publishing","_id":"51519","language":[{"iso":"eng"}],"main_file_link":[{"open_access":"1","url":"https://iopscience.iop.org/article/10.1088/2515-7647/ad1a3b"}],"publication_status":"published","date_updated":"2024-02-20T07:03:00Z","author":[{"first_name":"Tie Jun","last_name":"Cui","full_name":"Cui, Tie Jun"},{"last_name":"Zhang","first_name":"Shuang","full_name":"Zhang, Shuang"},{"full_name":"Alu, Andrea","first_name":"Andrea","last_name":"Alu"},{"full_name":"Wegener, Martin","first_name":"Martin","last_name":"Wegener"},{"last_name":"Pendry","first_name":"John","full_name":"Pendry, John"},{"last_name":"Luo","first_name":"Jie","full_name":"Luo, Jie"},{"full_name":"Lai, Yun","last_name":"Lai","first_name":"Yun"},{"last_name":"Wang","first_name":"Zuojia","full_name":"Wang, Zuojia"},{"first_name":"Xiao","last_name":"Lin","full_name":"Lin, Xiao"},{"full_name":"Chen, Hongsheng","last_name":"Chen","first_name":"Hongsheng"},{"full_name":"Chen, Ping","last_name":"Chen","first_name":"Ping"},{"full_name":"Wu, Rui-Xin","last_name":"Wu","first_name":"Rui-Xin"},{"full_name":"Yin, Yuhang","first_name":"Yuhang","last_name":"Yin"},{"first_name":"Pengfei","last_name":"Zhao","full_name":"Zhao, Pengfei"},{"full_name":"Chen, Huanyang","last_name":"Chen","first_name":"Huanyang"},{"first_name":"Yue","last_name":"Li","full_name":"Li, Yue"},{"full_name":"Zhou, Ziheng","first_name":"Ziheng","last_name":"Zhou"},{"full_name":"Engheta, Nader","last_name":"Engheta","first_name":"Nader"},{"full_name":"Asadchy, V. S.","first_name":"V. S.","last_name":"Asadchy"},{"first_name":"Constantin","last_name":"Simovski","full_name":"Simovski, Constantin"},{"full_name":"Tretyakov, Sergei A","first_name":"Sergei A","last_name":"Tretyakov"},{"full_name":"Yang, Biao","first_name":"Biao","last_name":"Yang"},{"last_name":"Campbell","first_name":"Sawyer D.","full_name":"Campbell, Sawyer D."},{"full_name":"Hao, Yang","first_name":"Yang","last_name":"Hao"},{"full_name":"Werner, Douglas H","last_name":"Werner","first_name":"Douglas H"},{"first_name":"Shulin","last_name":"Sun","full_name":"Sun, Shulin"},{"last_name":"Zhou","first_name":"Lei","full_name":"Zhou, Lei"},{"first_name":"Su","last_name":"Xu","full_name":"Xu, Su"},{"first_name":"Hong-Bo","last_name":"Sun","full_name":"Sun, Hong-Bo"},{"last_name":"Zhou","first_name":"Zhou","full_name":"Zhou, Zhou"},{"full_name":"Li, Zile","first_name":"Zile","last_name":"Li"},{"last_name":"Zheng","first_name":"Guoxing","full_name":"Zheng, Guoxing"},{"full_name":"Chen, Xianzhong","first_name":"Xianzhong","last_name":"Chen"},{"full_name":"Li, Tao","last_name":"Li","first_name":"Tao"},{"full_name":"Zhu, Shi-Ning","first_name":"Shi-Ning","last_name":"Zhu"},{"first_name":"Junxiao","last_name":"Zhou","full_name":"Zhou, Junxiao"},{"last_name":"Zhao","first_name":"Junxiang","full_name":"Zhao, Junxiang"},{"full_name":"Liu, Zhaowei","first_name":"Zhaowei","last_name":"Liu"},{"first_name":"Yuchao","last_name":"Zhang","full_name":"Zhang, Yuchao"},{"full_name":"Zhang, Qiming","last_name":"Zhang","first_name":"Qiming"},{"last_name":"Gu","first_name":"Min","full_name":"Gu, Min"},{"full_name":"Xiao, Shumin","last_name":"Xiao","first_name":"Shumin"},{"first_name":"Yongmin","last_name":"Liu","full_name":"Liu, Yongmin"},{"full_name":"Zhang, Xiaoyu","first_name":"Xiaoyu","last_name":"Zhang"},{"full_name":"Tang, Yutao","first_name":"Yutao","last_name":"Tang"},{"first_name":"Guixin","last_name":"Li","full_name":"Li, Guixin"},{"full_name":"Zentgraf, Thomas","first_name":"Thomas","orcid":"0000-0002-8662-1101","last_name":"Zentgraf","id":"30525"},{"full_name":"Koshelev, Kirill","first_name":"Kirill","last_name":"Koshelev"},{"first_name":"Yuri S.","last_name":"Kivshar","full_name":"Kivshar, Yuri S."},{"first_name":"Xin","last_name":"Li","full_name":"Li, Xin"},{"full_name":"Badloe, Trevon","first_name":"Trevon","last_name":"Badloe"},{"full_name":"Huang, Lingling","last_name":"Huang","first_name":"Lingling"},{"last_name":"Rho","first_name":"Junsuk","full_name":"Rho, Junsuk"},{"full_name":"Wang, Shuming","last_name":"Wang","first_name":"Shuming"},{"last_name":"Tsai","first_name":"Din Ping","full_name":"Tsai, Din Ping"},{"full_name":"Bykov, A. Yu.","last_name":"Bykov","first_name":"A. Yu."},{"first_name":"Alexey V","last_name":"Krasavin","full_name":"Krasavin, Alexey V"},{"full_name":"Zayats, Anatoly V","first_name":"Anatoly V","last_name":"Zayats"},{"first_name":"Cormac","last_name":"McDonnell","full_name":"McDonnell, Cormac"},{"last_name":"Ellenbogen","first_name":"Tal","full_name":"Ellenbogen, Tal"},{"full_name":"Luo, Xiangang","last_name":"Luo","first_name":"Xiangang"},{"full_name":"Pu, Mingbo","first_name":"Mingbo","last_name":"Pu"},{"last_name":"Garcia-Vidal","first_name":"Francisco J","full_name":"Garcia-Vidal, Francisco J"},{"full_name":"Liu, Liangliang","first_name":"Liangliang","last_name":"Liu"},{"full_name":"Li, Zhuo","first_name":"Zhuo","last_name":"Li"},{"full_name":"Tang, Wenxuan","first_name":"Wenxuan","last_name":"Tang"},{"first_name":"Hui Feng","last_name":"Ma","full_name":"Ma, Hui Feng"},{"last_name":"Zhang","first_name":"Jingjing","full_name":"Zhang, Jingjing"},{"first_name":"Yu","last_name":"Luo","full_name":"Luo, Yu"},{"last_name":"Zhang","first_name":"Xuanru","full_name":"Zhang, Xuanru"},{"first_name":"Hao Chi","last_name":"Zhang","full_name":"Zhang, Hao Chi"},{"first_name":"Pei Hang","last_name":"He","full_name":"He, Pei Hang"},{"full_name":"Zhang, Le Peng","last_name":"Zhang","first_name":"Le Peng"},{"full_name":"Wan, Xiang","first_name":"Xiang","last_name":"Wan"},{"full_name":"Wu, Haotian","last_name":"Wu","first_name":"Haotian"},{"full_name":"Liu, Shuo","last_name":"Liu","first_name":"Shuo"},{"first_name":"Wei Xiang","last_name":"Jiang","full_name":"Jiang, Wei Xiang"},{"full_name":"Zhang, Xin Ge","last_name":"Zhang","first_name":"Xin Ge"},{"full_name":"Qiu, Chengwei","first_name":"Chengwei","last_name":"Qiu"},{"last_name":"Ma","first_name":"Qian","full_name":"Ma, Qian"},{"full_name":"Liu, Che","last_name":"Liu","first_name":"Che"},{"first_name":"Long","last_name":"Li","full_name":"Li, Long"},{"first_name":"Jiaqi","last_name":"Han","full_name":"Han, Jiaqi"},{"first_name":"Lianlin","last_name":"Li","full_name":"Li, Lianlin"},{"last_name":"Cotrufo","first_name":"Michele","full_name":"Cotrufo, Michele"},{"full_name":"Caloz, Christophe","last_name":"Caloz","first_name":"Christophe"},{"full_name":"Deck-Léger, Z.-L.","first_name":"Z.-L.","last_name":"Deck-Léger"},{"first_name":"A.","last_name":"Bahrami","full_name":"Bahrami, A."},{"full_name":"Céspedes, O.","first_name":"O.","last_name":"Céspedes"},{"last_name":"Galiffi","first_name":"Emanuele","full_name":"Galiffi, Emanuele"},{"full_name":"Huidobro, P. A.","first_name":"P. A.","last_name":"Huidobro"},{"full_name":"Cheng, Qiang","first_name":"Qiang","last_name":"Cheng"},{"first_name":"Jun Yan","last_name":"Dai","full_name":"Dai, Jun Yan"},{"first_name":"Jun Cheng","last_name":"Ke","full_name":"Ke, Jun Cheng"},{"first_name":"Lei","last_name":"Zhang","full_name":"Zhang, Lei"},{"full_name":"Galdi, Vincenzo","last_name":"Galdi","first_name":"Vincenzo"},{"first_name":"Marco","last_name":"Di Renzo","full_name":"Di Renzo, Marco"}],"publication_identifier":{"issn":["2515-7647"]},"year":"2024","title":"Roadmap on electromagnetic metamaterials and metasurfaces","status":"public"},{"_id":"54544","publisher":"American Physical Society (APS)","user_id":"88149","volume":5,"status":"public","citation":{"bibtex":"@article{Roeder_Pollmann_Stefszky_Santandrea_Luo_Quiring_Ricken_Eigner_Brecht_Silberhorn_2024, title={Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer}, volume={5}, DOI={<a href=\"https://doi.org/10.1103/prxquantum.5.020350\">10.1103/prxquantum.5.020350</a>}, number={2020350}, journal={PRX Quantum}, publisher={American Physical Society (APS)}, author={Roeder, Franz and Pollmann, René and Stefszky, Michael and Santandrea, Matteo and Luo, Kai Hong and Quiring, V. and Ricken, Raimund and Eigner, Christof and Brecht, Benjamin and Silberhorn, Christine}, year={2024} }","ama":"Roeder F, Pollmann R, Stefszky M, et al. Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer. <i>PRX Quantum</i>. 2024;5(2). doi:<a href=\"https://doi.org/10.1103/prxquantum.5.020350\">10.1103/prxquantum.5.020350</a>","mla":"Roeder, Franz, et al. “Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer.” <i>PRX Quantum</i>, vol. 5, no. 2, 020350, American Physical Society (APS), 2024, doi:<a href=\"https://doi.org/10.1103/prxquantum.5.020350\">10.1103/prxquantum.5.020350</a>.","chicago":"Roeder, Franz, René Pollmann, Michael Stefszky, Matteo Santandrea, Kai Hong Luo, V. Quiring, Raimund Ricken, Christof Eigner, Benjamin Brecht, and Christine Silberhorn. “Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer.” <i>PRX Quantum</i> 5, no. 2 (2024). <a href=\"https://doi.org/10.1103/prxquantum.5.020350\">https://doi.org/10.1103/prxquantum.5.020350</a>.","short":"F. Roeder, R. Pollmann, M. Stefszky, M. Santandrea, K.H. Luo, V. Quiring, R. Ricken, C. Eigner, B. Brecht, C. Silberhorn, PRX Quantum 5 (2024).","ieee":"F. Roeder <i>et al.</i>, “Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer,” <i>PRX Quantum</i>, vol. 5, no. 2, Art. no. 020350, 2024, doi: <a href=\"https://doi.org/10.1103/prxquantum.5.020350\">10.1103/prxquantum.5.020350</a>.","apa":"Roeder, F., Pollmann, R., Stefszky, M., Santandrea, M., Luo, K. H., Quiring, V., Ricken, R., Eigner, C., Brecht, B., &#38; Silberhorn, C. (2024). Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer. <i>PRX Quantum</i>, <i>5</i>(2), Article 020350. <a href=\"https://doi.org/10.1103/prxquantum.5.020350\">https://doi.org/10.1103/prxquantum.5.020350</a>"},"project":[{"name":"MiLiQuant: Miniaturisierte Lichtquellen für den industriellen Einsatz in Quantensensoren und Quanten-Imaging-Systemen (MiLiQuant) - Teilvorhaben: Technologie und Theorie für MIR Quanten-Imaging Systeme","grant_number":"13N15065","_id":"207"},{"name":"MIRAQLS: MIRAQLS: Mid-infrared Quantum Technology for Sensing","grant_number":"101070700","_id":"571"},{"name":"E2TPA: Exploiting Entangled Two-Photon Absorption","_id":"190"}],"article_number":"020350","language":[{"iso":"eng"}],"doi":"10.1103/prxquantum.5.020350","title":"Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer","year":"2024","publication_identifier":{"issn":["2691-3399"]},"author":[{"full_name":"Roeder, Franz","last_name":"Roeder","first_name":"Franz","id":"88149"},{"id":"78890","full_name":"Pollmann, René","last_name":"Pollmann","first_name":"René"},{"first_name":"Michael","last_name":"Stefszky","full_name":"Stefszky, Michael","id":"42777"},{"orcid":"0000-0001-5718-358X","first_name":"Matteo","last_name":"Santandrea","full_name":"Santandrea, Matteo","id":"55095"},{"id":"36389","last_name":"Luo","orcid":"0000-0003-1008-4976","first_name":"Kai Hong","full_name":"Luo, Kai Hong"},{"full_name":"Quiring, V.","first_name":"V.","last_name":"Quiring"},{"last_name":"Ricken","first_name":"Raimund","full_name":"Ricken, Raimund"},{"id":"13244","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","first_name":"Christof","full_name":"Eigner, Christof"},{"id":"27150","first_name":"Benjamin","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","full_name":"Brecht, Benjamin"},{"id":"26263","last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine"}],"date_updated":"2024-06-01T13:00:53Z","publication_status":"published","intvolume":"         5","date_created":"2024-06-01T12:48:51Z","type":"journal_article","department":[{"_id":"288"},{"_id":"623"}],"publication":"PRX Quantum","issue":"2","abstract":[{"lang":"eng","text":"The biphoton correlation time, a measure for the conditional uncertainty in the temporal arrival of two photons from a photon pair source, is a key performance identifier for many quantum spectroscopy applications, with shorter correlation times typically yielding better performance. Furthermore, it provides fundamental insight into the effects of dispersion on the biphoton state. Here, we show that a characteristic dependence of the width of the temporal interferogram can be exploited to obtain insights into the amount of second-order dispersion inside the interferometer and to retrieve actual and Fourier-limited ultrashort biphoton correlation times of around 100 fs. In the presented scheme, we simultaneously measure spectral and temporal interferograms at the output of an SU(1,1) interferometer based on an integrated broadband parametric down conversion source in a Ti:LiNbO3 waveguide."}]},{"issue":"24","publication":"Physical Review Letters","type":"journal_article","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"date_created":"2024-06-19T06:36:54Z","publication_status":"published","date_updated":"2024-06-19T06:59:45Z","intvolume":"       132","title":"Certifying the Topology of Quantum Networks: Theory and Experiment","year":"2024","publication_identifier":{"issn":["0031-9007","1079-7114"]},"author":[{"full_name":"Weinbrenner, Lisa T.","last_name":"Weinbrenner","first_name":"Lisa T."},{"first_name":"Nidhin","last_name":"Prasannan","full_name":"Prasannan, Nidhin","id":"71403"},{"full_name":"Hansenne, Kiara","last_name":"Hansenne","first_name":"Kiara"},{"full_name":"Denker, Sophia","last_name":"Denker","first_name":"Sophia"},{"full_name":"Sperling, Jan","orcid":"0000-0002-5844-3205","last_name":"Sperling","first_name":"Jan","id":"75127"},{"full_name":"Brecht, Benjamin","first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","id":"27150"},{"full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn","id":"26263"},{"first_name":"Otfried","last_name":"Gühne","full_name":"Gühne, Otfried"}],"doi":"10.1103/physrevlett.132.240802","article_number":"240802","language":[{"iso":"eng"}],"citation":{"ieee":"L. T. Weinbrenner <i>et al.</i>, “Certifying the Topology of Quantum Networks: Theory and Experiment,” <i>Physical Review Letters</i>, vol. 132, no. 24, Art. no. 240802, 2024, doi: <a href=\"https://doi.org/10.1103/physrevlett.132.240802\">10.1103/physrevlett.132.240802</a>.","apa":"Weinbrenner, L. T., Prasannan, N., Hansenne, K., Denker, S., Sperling, J., Brecht, B., Silberhorn, C., &#38; Gühne, O. (2024). Certifying the Topology of Quantum Networks: Theory and Experiment. <i>Physical Review Letters</i>, <i>132</i>(24), Article 240802. <a href=\"https://doi.org/10.1103/physrevlett.132.240802\">https://doi.org/10.1103/physrevlett.132.240802</a>","short":"L.T. Weinbrenner, N. Prasannan, K. Hansenne, S. Denker, J. Sperling, B. Brecht, C. Silberhorn, O. Gühne, Physical Review Letters 132 (2024).","chicago":"Weinbrenner, Lisa T., Nidhin Prasannan, Kiara Hansenne, Sophia Denker, Jan Sperling, Benjamin Brecht, Christine Silberhorn, and Otfried Gühne. “Certifying the Topology of Quantum Networks: Theory and Experiment.” <i>Physical Review Letters</i> 132, no. 24 (2024). <a href=\"https://doi.org/10.1103/physrevlett.132.240802\">https://doi.org/10.1103/physrevlett.132.240802</a>.","mla":"Weinbrenner, Lisa T., et al. “Certifying the Topology of Quantum Networks: Theory and Experiment.” <i>Physical Review Letters</i>, vol. 132, no. 24, 240802, American Physical Society (APS), 2024, doi:<a href=\"https://doi.org/10.1103/physrevlett.132.240802\">10.1103/physrevlett.132.240802</a>.","bibtex":"@article{Weinbrenner_Prasannan_Hansenne_Denker_Sperling_Brecht_Silberhorn_Gühne_2024, title={Certifying the Topology of Quantum Networks: Theory and Experiment}, volume={132}, DOI={<a href=\"https://doi.org/10.1103/physrevlett.132.240802\">10.1103/physrevlett.132.240802</a>}, number={24240802}, journal={Physical Review Letters}, publisher={American Physical Society (APS)}, author={Weinbrenner, Lisa T. and Prasannan, Nidhin and Hansenne, Kiara and Denker, Sophia and Sperling, Jan and Brecht, Benjamin and Silberhorn, Christine and Gühne, Otfried}, year={2024} }","ama":"Weinbrenner LT, Prasannan N, Hansenne K, et al. Certifying the Topology of Quantum Networks: Theory and Experiment. <i>Physical Review Letters</i>. 2024;132(24). doi:<a href=\"https://doi.org/10.1103/physrevlett.132.240802\">10.1103/physrevlett.132.240802</a>"},"status":"public","user_id":"27150","volume":132,"_id":"54812","publisher":"American Physical Society (APS)"},{"abstract":[{"text":"The lithium niobate–lithium tantalate solid solution’s phase diagram was investigated using experimental data from differential thermal analysis (DTA) and crystal growth. We used XRF analysis to determine the elemental composition of the crystals. The Neumann–Kopp rule provided essential data for the end members lithium niobate (LN) and lithium tantalate (LT). The heats of fusion of the end members, given by DTA measurements, are 103 kJ/mol at 1531 K for LN and 289 kJ/mol at 1913 K for LT. These values were used as input parameters to generate the data. This data served as the basis for calculating a phase diagram for LN-LT solid solutions. Finally, based on the experimental data and a thermodynamic solution model, the Calphad Factsage module optimized the phase diagram. We also generated thermodynamic parameters for Gibbs’ excess energy of the solid solution. A plot of the segregation coefficient as a function of Ta concentration was derived from the phase diagram.","lang":"eng"}],"publication":"Journal of Materials Science","type":"journal_article","department":[{"_id":"15"},{"_id":"169"},{"_id":"623"}],"date_created":"2024-07-05T06:47:53Z","date_updated":"2024-07-05T06:49:25Z","publication_status":"published","title":"Evaluation and thermodynamic optimization of phase diagram of lithium niobate tantalate solid solutions","year":"2024","author":[{"full_name":"Bashir, Umar","last_name":"Bashir","first_name":"Umar"},{"full_name":"Klimm, Detlef","first_name":"Detlef","last_name":"Klimm"},{"id":"22501","full_name":"Rüsing, Michael","first_name":"Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing"},{"full_name":"Bickermann, Matthias","last_name":"Bickermann","first_name":"Matthias"},{"last_name":"Ganschow","first_name":"Steffen","full_name":"Ganschow, Steffen"}],"publication_identifier":{"issn":["0022-2461","1573-4803"]},"doi":"10.1007/s10853-024-09932-7","main_file_link":[{"url":"https://doi.org/10.1007/s10853-024-09932-7","open_access":"1"}],"language":[{"iso":"eng"}],"quality_controlled":"1","citation":{"chicago":"Bashir, Umar, Detlef Klimm, Michael Rüsing, Matthias Bickermann, and Steffen Ganschow. “Evaluation and Thermodynamic Optimization of Phase Diagram of Lithium Niobate Tantalate Solid Solutions.” <i>Journal of Materials Science</i>, 2024. <a href=\"https://doi.org/10.1007/s10853-024-09932-7\">https://doi.org/10.1007/s10853-024-09932-7</a>.","short":"U. Bashir, D. Klimm, M. Rüsing, M. Bickermann, S. Ganschow, Journal of Materials Science (2024).","apa":"Bashir, U., Klimm, D., Rüsing, M., Bickermann, M., &#38; Ganschow, S. (2024). Evaluation and thermodynamic optimization of phase diagram of lithium niobate tantalate solid solutions. <i>Journal of Materials Science</i>. <a href=\"https://doi.org/10.1007/s10853-024-09932-7\">https://doi.org/10.1007/s10853-024-09932-7</a>","ieee":"U. Bashir, D. Klimm, M. Rüsing, M. Bickermann, and S. Ganschow, “Evaluation and thermodynamic optimization of phase diagram of lithium niobate tantalate solid solutions,” <i>Journal of Materials Science</i>, 2024, doi: <a href=\"https://doi.org/10.1007/s10853-024-09932-7\">10.1007/s10853-024-09932-7</a>.","ama":"Bashir U, Klimm D, Rüsing M, Bickermann M, Ganschow S. Evaluation and thermodynamic optimization of phase diagram of lithium niobate tantalate solid solutions. <i>Journal of Materials Science</i>. Published online 2024. doi:<a href=\"https://doi.org/10.1007/s10853-024-09932-7\">10.1007/s10853-024-09932-7</a>","bibtex":"@article{Bashir_Klimm_Rüsing_Bickermann_Ganschow_2024, title={Evaluation and thermodynamic optimization of phase diagram of lithium niobate tantalate solid solutions}, DOI={<a href=\"https://doi.org/10.1007/s10853-024-09932-7\">10.1007/s10853-024-09932-7</a>}, journal={Journal of Materials Science}, publisher={Springer Science and Business Media LLC}, author={Bashir, Umar and Klimm, Detlef and Rüsing, Michael and Bickermann, Matthias and Ganschow, Steffen}, year={2024} }","mla":"Bashir, Umar, et al. “Evaluation and Thermodynamic Optimization of Phase Diagram of Lithium Niobate Tantalate Solid Solutions.” <i>Journal of Materials Science</i>, Springer Science and Business Media LLC, 2024, doi:<a href=\"https://doi.org/10.1007/s10853-024-09932-7\">10.1007/s10853-024-09932-7</a>."},"oa":"1","status":"public","user_id":"22501","_id":"55085","publisher":"Springer Science and Business Media LLC"},{"status":"public","has_accepted_license":"1","page":"22878","publisher":"Optica Publishing Group","_id":"54668","ddc":["530"],"user_id":"158","volume":32,"file_date_updated":"2024-06-10T11:25:00Z","citation":{"short":"M. Hammer, S. Babel, H. Farheen, L. Padberg, J.C. Scheytt, C. Silberhorn, J. Förstner, Optics Express 32 (2024) 22878.","chicago":"Hammer, Manfred, Silia Babel, Henna Farheen, Laura Padberg, J. Christoph Scheytt, Christine Silberhorn, and Jens Förstner. “Estimation of Losses Caused by Sidewall Roughness in Thin-Film Lithium Niobate Rib and Strip Waveguides.” <i>Optics Express</i> 32, no. 13 (2024): 22878. <a href=\"https://doi.org/10.1364/oe.521766\">https://doi.org/10.1364/oe.521766</a>.","ieee":"M. Hammer <i>et al.</i>, “Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides,” <i>Optics Express</i>, vol. 32, no. 13, p. 22878, 2024, doi: <a href=\"https://doi.org/10.1364/oe.521766\">10.1364/oe.521766</a>.","apa":"Hammer, M., Babel, S., Farheen, H., Padberg, L., Scheytt, J. C., Silberhorn, C., &#38; Förstner, J. (2024). Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides. <i>Optics Express</i>, <i>32</i>(13), 22878. <a href=\"https://doi.org/10.1364/oe.521766\">https://doi.org/10.1364/oe.521766</a>","bibtex":"@article{Hammer_Babel_Farheen_Padberg_Scheytt_Silberhorn_Förstner_2024, title={Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides}, volume={32}, DOI={<a href=\"https://doi.org/10.1364/oe.521766\">10.1364/oe.521766</a>}, number={13}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Hammer, Manfred and Babel, Silia and Farheen, Henna and Padberg, Laura and Scheytt, J. Christoph and Silberhorn, Christine and Förstner, Jens}, year={2024}, pages={22878} }","ama":"Hammer M, Babel S, Farheen H, et al. Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides. <i>Optics Express</i>. 2024;32(13):22878. doi:<a href=\"https://doi.org/10.1364/oe.521766\">10.1364/oe.521766</a>","mla":"Hammer, Manfred, et al. “Estimation of Losses Caused by Sidewall Roughness in Thin-Film Lithium Niobate Rib and Strip Waveguides.” <i>Optics Express</i>, vol. 32, no. 13, Optica Publishing Group, 2024, p. 22878, doi:<a href=\"https://doi.org/10.1364/oe.521766\">10.1364/oe.521766</a>."},"project":[{"_id":"53","grant_number":"231447078","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"},{"grant_number":"231447078","_id":"175","name":"TRR 142 - C11: TRR 142 - Kompakte Photonenpaar-Quelle mit ultraschnellen Modulatoren auf Basis von CMOS und LNOI (C11*)"},{"name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)","grant_number":"231447078","_id":"167"},{"grant_number":"PROFILNRW-2020-067","_id":"266","name":"PhoQC: PhoQC: Photonisches Quantencomputing"}],"oa":"1","year":"2024","title":"Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides","author":[{"id":"48077","orcid":"0000-0002-6331-9348","last_name":"Hammer","first_name":"Manfred","full_name":"Hammer, Manfred"},{"id":"63231","first_name":"Silia","last_name":"Babel","orcid":"https://orcid.org/0000-0002-1568-2580","full_name":"Babel, Silia"},{"id":"53444","last_name":"Farheen","orcid":"0000-0001-7730-3489","first_name":"Henna","full_name":"Farheen, Henna"},{"id":"40300","first_name":"Laura","last_name":"Padberg","full_name":"Padberg, Laura"},{"id":"37144","orcid":"0000-0002-5950-6618 ","first_name":"J. Christoph","last_name":"Scheytt","full_name":"Scheytt, J. Christoph"},{"first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263"},{"orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens","full_name":"Förstner, Jens","id":"158"}],"publication_identifier":{"issn":["1094-4087"]},"date_updated":"2024-07-22T07:43:02Z","publication_status":"published","intvolume":"        32","language":[{"iso":"eng"}],"doi":"10.1364/oe.521766","issue":"13","publication":"Optics Express","abstract":[{"text":"Samples of dielectric optical waveguides of rib or strip type in thin-film lithium niobate (TFLN) technology are characterized with respect to their optical loss using the Fabry-Pérot method. Attributing the losses mainly to sidewall roughness, we employ a simple perturbational procedure, based on rigorously computed mode profiles of idealized channels, to estimate the attenuation for waveguides with different cross sections. A single fit parameter suffices for an adequate modelling of the effect of the waveguide geometry on the loss levels.","lang":"eng"}],"file":[{"content_type":"application/pdf","file_id":"54669","access_level":"open_access","file_size":4004782,"file_name":"2024-06 Hammer - Optics Express - Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides.pdf","date_updated":"2024-06-10T11:25:00Z","relation":"main_file","date_created":"2024-06-10T11:25:00Z","creator":"fossie"}],"date_created":"2024-06-10T11:18:06Z","type":"journal_article","keyword":["tet_topic_waveguide"],"department":[{"_id":"61"},{"_id":"429"},{"_id":"623"},{"_id":"263"},{"_id":"288"}]},{"date_created":"2024-05-10T08:45:43Z","type":"journal_article","department":[{"_id":"286"},{"_id":"15"}],"publication":"Small","citation":{"short":"M. Groll, J. Bürger, I. Caltzidis, K.D. Jöns, W.G. Schmidt, U. Gerstmann, J.K.N. Lindner, Small (2024).","chicago":"Groll, Maja, Julius Bürger, Ioannis Caltzidis, Klaus D. Jöns, Wolf Gero Schmidt, Uwe Gerstmann, and Jörg K. N. Lindner. “DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging.” <i>Small</i>, 2024. <a href=\"https://doi.org/10.1002/smll.202311635\">https://doi.org/10.1002/smll.202311635</a>.","ieee":"M. Groll <i>et al.</i>, “DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging,” <i>Small</i>, 2024, doi: <a href=\"https://doi.org/10.1002/smll.202311635\">10.1002/smll.202311635</a>.","apa":"Groll, M., Bürger, J., Caltzidis, I., Jöns, K. D., Schmidt, W. G., Gerstmann, U., &#38; Lindner, J. K. N. (2024). DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging. <i>Small</i>. <a href=\"https://doi.org/10.1002/smll.202311635\">https://doi.org/10.1002/smll.202311635</a>","bibtex":"@article{Groll_Bürger_Caltzidis_Jöns_Schmidt_Gerstmann_Lindner_2024, title={DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging}, DOI={<a href=\"https://doi.org/10.1002/smll.202311635\">10.1002/smll.202311635</a>}, journal={Small}, publisher={Wiley}, author={Groll, Maja and Bürger, Julius and Caltzidis, Ioannis and Jöns, Klaus D. and Schmidt, Wolf Gero and Gerstmann, Uwe and Lindner, Jörg K. N.}, year={2024} }","ama":"Groll M, Bürger J, Caltzidis I, et al. DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging. <i>Small</i>. Published online 2024. doi:<a href=\"https://doi.org/10.1002/smll.202311635\">10.1002/smll.202311635</a>","mla":"Groll, Maja, et al. “DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging.” <i>Small</i>, Wiley, 2024, doi:<a href=\"https://doi.org/10.1002/smll.202311635\">10.1002/smll.202311635</a>."},"abstract":[{"text":"<jats:title>Abstract</jats:title><jats:p>Most properties of solid materials are defined by their internal electric field and charge density distributions which so far are difficult to measure with high spatial resolution. Especially for 2D materials, the atomic electric fields influence the optoelectronic properties. In this study, the atomic‐scale electric field and charge density distribution of WSe<jats:sub>2</jats:sub> bi‐ and trilayers are revealed using an emerging microscopy technique, differential phase contrast (DPC) imaging in scanning transmission electron microscopy (STEM). For pristine material, a higher positive charge density located at the selenium atomic columns compared to the tungsten atomic columns is obtained and tentatively explained by a coherent scattering effect. Furthermore, the change in the electric field distribution induced by a missing selenium atomic column is investigated. A characteristic electric field distribution in the vicinity of the defect with locally reduced magnitudes compared to the pristine lattice is observed. This effect is accompanied by a considerable inward relaxation of the surrounding lattice, which according to first principles DFT calculation is fully compatible with a missing column of Se atoms. This shows that DPC imaging, as an electric field sensitive technique, provides additional and remarkable information to the otherwise only structural analysis obtained with conventional STEM imaging.</jats:p>","lang":"eng"}],"language":[{"iso":"eng"}],"_id":"54147","publisher":"Wiley","user_id":"77496","doi":"10.1002/smll.202311635","title":"DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging","status":"public","year":"2024","publication_identifier":{"issn":["1613-6810","1613-6829"]},"author":[{"first_name":"Maja","last_name":"Groll","full_name":"Groll, Maja"},{"first_name":"Julius","last_name":"Bürger","full_name":"Bürger, Julius"},{"first_name":"Ioannis","last_name":"Caltzidis","full_name":"Caltzidis, Ioannis"},{"full_name":"Jöns, Klaus D.","first_name":"Klaus D.","last_name":"Jöns"},{"first_name":"Wolf Gero","last_name":"Schmidt","full_name":"Schmidt, Wolf Gero"},{"full_name":"Gerstmann, Uwe","first_name":"Uwe","last_name":"Gerstmann"},{"first_name":"Jörg K. N.","last_name":"Lindner","full_name":"Lindner, Jörg K. N."}],"publication_status":"published","date_updated":"2025-01-22T09:06:46Z"},{"_id":"57954","publisher":"Elsevier BV","language":[{"iso":"eng"}],"article_number":"120326","volume":284,"doi":"10.1016/j.actamat.2024.120326","user_id":"77496","author":[{"full_name":"Hengsbach, Florian","last_name":"Hengsbach","first_name":"Florian"},{"last_name":"Bürger","first_name":"Julius","full_name":"Bürger, Julius"},{"full_name":"Andreiev, Anatolii","last_name":"Andreiev","first_name":"Anatolii"},{"full_name":"Biggs, Krista","first_name":"Krista","last_name":"Biggs"},{"last_name":"Fischer-Bühner","first_name":"Jörg","full_name":"Fischer-Bühner, Jörg"},{"last_name":"Lindner","first_name":"Jörg K.N","full_name":"Lindner, Jörg K.N"},{"last_name":"Hoyer","first_name":"Kay-Peter","full_name":"Hoyer, Kay-Peter"},{"full_name":"Olson, Gregory B.","first_name":"Gregory B.","last_name":"Olson"},{"last_name":"Schaper","first_name":"Mirko","full_name":"Schaper, Mirko"}],"publication_identifier":{"issn":["1359-6454"]},"status":"public","title":"Die steel design for additive manufacturing","year":"2024","intvolume":"       284","date_updated":"2025-01-22T09:06:37Z","publication_status":"published","date_created":"2025-01-06T11:31:51Z","department":[{"_id":"286"},{"_id":"15"}],"type":"journal_article","citation":{"apa":"Hengsbach, F., Bürger, J., Andreiev, A., Biggs, K., Fischer-Bühner, J., Lindner, J. K. N., Hoyer, K.-P., Olson, G. B., &#38; Schaper, M. (2024). Die steel design for additive manufacturing. <i>Acta Materialia</i>, <i>284</i>, Article 120326. <a href=\"https://doi.org/10.1016/j.actamat.2024.120326\">https://doi.org/10.1016/j.actamat.2024.120326</a>","ieee":"F. Hengsbach <i>et al.</i>, “Die steel design for additive manufacturing,” <i>Acta Materialia</i>, vol. 284, Art. no. 120326, 2024, doi: <a href=\"https://doi.org/10.1016/j.actamat.2024.120326\">10.1016/j.actamat.2024.120326</a>.","chicago":"Hengsbach, Florian, Julius Bürger, Anatolii Andreiev, Krista Biggs, Jörg Fischer-Bühner, Jörg K.N Lindner, Kay-Peter Hoyer, Gregory B. Olson, and Mirko Schaper. “Die Steel Design for Additive Manufacturing.” <i>Acta Materialia</i> 284 (2024). <a href=\"https://doi.org/10.1016/j.actamat.2024.120326\">https://doi.org/10.1016/j.actamat.2024.120326</a>.","short":"F. Hengsbach, J. Bürger, A. Andreiev, K. Biggs, J. Fischer-Bühner, J.K.N. Lindner, K.-P. Hoyer, G.B. Olson, M. Schaper, Acta Materialia 284 (2024).","mla":"Hengsbach, Florian, et al. “Die Steel Design for Additive Manufacturing.” <i>Acta Materialia</i>, vol. 284, 120326, Elsevier BV, 2024, doi:<a href=\"https://doi.org/10.1016/j.actamat.2024.120326\">10.1016/j.actamat.2024.120326</a>.","ama":"Hengsbach F, Bürger J, Andreiev A, et al. Die steel design for additive manufacturing. <i>Acta Materialia</i>. 2024;284. doi:<a href=\"https://doi.org/10.1016/j.actamat.2024.120326\">10.1016/j.actamat.2024.120326</a>","bibtex":"@article{Hengsbach_Bürger_Andreiev_Biggs_Fischer-Bühner_Lindner_Hoyer_Olson_Schaper_2024, title={Die steel design for additive manufacturing}, volume={284}, DOI={<a href=\"https://doi.org/10.1016/j.actamat.2024.120326\">10.1016/j.actamat.2024.120326</a>}, number={120326}, journal={Acta Materialia}, publisher={Elsevier BV}, author={Hengsbach, Florian and Bürger, Julius and Andreiev, Anatolii and Biggs, Krista and Fischer-Bühner, Jörg and Lindner, Jörg K.N and Hoyer, Kay-Peter and Olson, Gregory B. and Schaper, Mirko}, year={2024} }"},"publication":"Acta Materialia"},{"publication_status":"published","date_updated":"2025-01-22T09:06:50Z","year":"2024","title":"ADMM-TGV image restoration for scientific applications with unbiased parameter choice","status":"public","publication_identifier":{"issn":["1017-1398","1572-9265"]},"author":[{"first_name":"Christian","last_name":"Zietlow","full_name":"Zietlow, Christian"},{"last_name":"Lindner","first_name":"Jörg K. N.","full_name":"Lindner, Jörg K. N."}],"user_id":"77496","doi":"10.1007/s11075-024-01759-2","_id":"52089","language":[{"iso":"eng"}],"publisher":"Springer Science and Business Media LLC","abstract":[{"lang":"eng","text":"<jats:title>Abstract</jats:title><jats:p>Image restoration via alternating direction method of multipliers (ADMM) has gained large interest within the last decade. Solving standard problems of Gaussian and Poisson noise, the set of “Total Variation” (TV)-based regularizers proved to be efficient and versatile. In the last few years, the “Total Generalized Variation” (TGV) approach combined TV regularizers of different orders adaptively to better suit local regions in the image. This improved the technique significantly. The approach solved the staircase problem inherent of the first-order TV while keeping the beneficial edge preservation. The iterative minimization for the augmented Lagrangian of TGV problems requires four important parameters: two penalty parameters <jats:inline-formula><jats:alternatives><jats:tex-math>$${\\rho }$$</jats:tex-math><mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\n                <mml:mi>ρ</mml:mi>\n              </mml:math></jats:alternatives></jats:inline-formula> and <jats:inline-formula><jats:alternatives><jats:tex-math>$${\\eta }$$</jats:tex-math><mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\n                <mml:mi>η</mml:mi>\n              </mml:math></jats:alternatives></jats:inline-formula> and two regularization parameters <jats:inline-formula><jats:alternatives><jats:tex-math>$${\\lambda _{0}}$$</jats:tex-math><mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\n                <mml:msub>\n                  <mml:mi>λ</mml:mi>\n                  <mml:mn>0</mml:mn>\n                </mml:msub>\n              </mml:math></jats:alternatives></jats:inline-formula> and <jats:inline-formula><jats:alternatives><jats:tex-math>$${\\lambda _{1}}$$</jats:tex-math><mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\n                <mml:msub>\n                  <mml:mi>λ</mml:mi>\n                  <mml:mn>1</mml:mn>\n                </mml:msub>\n              </mml:math></jats:alternatives></jats:inline-formula>. The choice of penalty parameters decides on the convergence speed, and the regularization parameters decide on the impact of the respective regularizer and are determined by the noise level in the image. For scientific applications of such algorithms, an automated and thus objective method to determine these parameters is essential to receive unbiased results independent of the user. Obviously, both sets of parameters are to be well chosen to achieve optimal results, too. In this paper, a method is proposed to adaptively choose optimal <jats:inline-formula><jats:alternatives><jats:tex-math>$${\\rho }$$</jats:tex-math><mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\n                <mml:mi>ρ</mml:mi>\n              </mml:math></jats:alternatives></jats:inline-formula> and <jats:inline-formula><jats:alternatives><jats:tex-math>$${\\eta }$$</jats:tex-math><mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\n                <mml:mi>η</mml:mi>\n              </mml:math></jats:alternatives></jats:inline-formula> values for the iteration to converge faster, based on the primal and dual residuals arising from the optimality conditions of the augmented Lagrangian. Further, we show how to choose <jats:inline-formula><jats:alternatives><jats:tex-math>$${\\lambda _{0}}$$</jats:tex-math><mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\n                <mml:msub>\n                  <mml:mi>λ</mml:mi>\n                  <mml:mn>0</mml:mn>\n                </mml:msub>\n              </mml:math></jats:alternatives></jats:inline-formula> and <jats:inline-formula><jats:alternatives><jats:tex-math>$${\\lambda _{1}}$$</jats:tex-math><mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\n                <mml:msub>\n                  <mml:mi>λ</mml:mi>\n                  <mml:mn>1</mml:mn>\n                </mml:msub>\n              </mml:math></jats:alternatives></jats:inline-formula> based on the inherent noise in the image.</jats:p>"}],"publication":"Numerical Algorithms","citation":{"mla":"Zietlow, Christian, and Jörg K. N. Lindner. “ADMM-TGV Image Restoration for Scientific Applications with Unbiased Parameter Choice.” <i>Numerical Algorithms</i>, Springer Science and Business Media LLC, 2024, doi:<a href=\"https://doi.org/10.1007/s11075-024-01759-2\">10.1007/s11075-024-01759-2</a>.","bibtex":"@article{Zietlow_Lindner_2024, title={ADMM-TGV image restoration for scientific applications with unbiased parameter choice}, DOI={<a href=\"https://doi.org/10.1007/s11075-024-01759-2\">10.1007/s11075-024-01759-2</a>}, journal={Numerical Algorithms}, publisher={Springer Science and Business Media LLC}, author={Zietlow, Christian and Lindner, Jörg K. N.}, year={2024} }","ama":"Zietlow C, Lindner JKN. ADMM-TGV image restoration for scientific applications with unbiased parameter choice. <i>Numerical Algorithms</i>. Published online 2024. doi:<a href=\"https://doi.org/10.1007/s11075-024-01759-2\">10.1007/s11075-024-01759-2</a>","ieee":"C. Zietlow and J. K. N. Lindner, “ADMM-TGV image restoration for scientific applications with unbiased parameter choice,” <i>Numerical Algorithms</i>, 2024, doi: <a href=\"https://doi.org/10.1007/s11075-024-01759-2\">10.1007/s11075-024-01759-2</a>.","apa":"Zietlow, C., &#38; Lindner, J. K. N. (2024). ADMM-TGV image restoration for scientific applications with unbiased parameter choice. <i>Numerical Algorithms</i>. <a href=\"https://doi.org/10.1007/s11075-024-01759-2\">https://doi.org/10.1007/s11075-024-01759-2</a>","short":"C. Zietlow, J.K.N. Lindner, Numerical Algorithms (2024).","chicago":"Zietlow, Christian, and Jörg K. N. Lindner. “ADMM-TGV Image Restoration for Scientific Applications with Unbiased Parameter Choice.” <i>Numerical Algorithms</i>, 2024. <a href=\"https://doi.org/10.1007/s11075-024-01759-2\">https://doi.org/10.1007/s11075-024-01759-2</a>."},"type":"journal_article","keyword":["Applied Mathematics"],"department":[{"_id":"286"},{"_id":"15"}],"date_created":"2024-02-27T07:35:36Z"},{"oa":"1","citation":{"ama":"Hempel F, Vernuccio F, König L, et al. Comparing transmission- and epi-BCARS: a round robin on solid-state materials. <i>Applied Optics</i>. 2024;63(1). doi:<a href=\"https://doi.org/10.1364/ao.505374\">10.1364/ao.505374</a>","bibtex":"@article{Hempel_Vernuccio_König_Buschbeck_Rüsing_Cerullo_Polli_Eng_2024, title={Comparing transmission- and epi-BCARS: a round robin on solid-state materials}, volume={63}, DOI={<a href=\"https://doi.org/10.1364/ao.505374\">10.1364/ao.505374</a>}, number={1112}, journal={Applied Optics}, publisher={Optica Publishing Group}, author={Hempel, Franz and Vernuccio, Federico and König, Lukas and Buschbeck, Robin and Rüsing, Michael and Cerullo, Giulio and Polli, Dario and Eng, Lukas M.}, year={2024} }","mla":"Hempel, Franz, et al. “Comparing Transmission- and Epi-BCARS: A Round Robin on Solid-State Materials.” <i>Applied Optics</i>, vol. 63, no. 1, 112, Optica Publishing Group, 2024, doi:<a href=\"https://doi.org/10.1364/ao.505374\">10.1364/ao.505374</a>.","short":"F. Hempel, F. Vernuccio, L. König, R. Buschbeck, M. Rüsing, G. Cerullo, D. Polli, L.M. Eng, Applied Optics 63 (2024).","chicago":"Hempel, Franz, Federico Vernuccio, Lukas König, Robin Buschbeck, Michael Rüsing, Giulio Cerullo, Dario Polli, and Lukas M. Eng. “Comparing Transmission- and Epi-BCARS: A Round Robin on Solid-State Materials.” <i>Applied Optics</i> 63, no. 1 (2024). <a href=\"https://doi.org/10.1364/ao.505374\">https://doi.org/10.1364/ao.505374</a>.","apa":"Hempel, F., Vernuccio, F., König, L., Buschbeck, R., Rüsing, M., Cerullo, G., Polli, D., &#38; Eng, L. M. (2024). Comparing transmission- and epi-BCARS: a round robin on solid-state materials. <i>Applied Optics</i>, <i>63</i>(1), Article 112. <a href=\"https://doi.org/10.1364/ao.505374\">https://doi.org/10.1364/ao.505374</a>","ieee":"F. Hempel <i>et al.</i>, “Comparing transmission- and epi-BCARS: a round robin on solid-state materials,” <i>Applied Optics</i>, vol. 63, no. 1, Art. no. 112, 2024, doi: <a href=\"https://doi.org/10.1364/ao.505374\">10.1364/ao.505374</a>."},"quality_controlled":"1","publisher":"Optica Publishing Group","_id":"49652","user_id":"22501","volume":63,"status":"public","date_created":"2023-12-15T07:32:38Z","type":"journal_article","keyword":["Atomic and Molecular Physics","and Optics","Engineering (miscellaneous)","Electrical and Electronic Engineering"],"department":[{"_id":"15"},{"_id":"288"},{"_id":"623"}],"publication":"Applied Optics","issue":"1","abstract":[{"lang":"eng","text":"Broadband coherent anti-Stokes Raman scattering (BCARS) is a powerful spectroscopy method combining high signal intensity with spectral sensitivity, enabling rapid imaging of heterogeneous samples in biomedical research and, more recently, in crystalline materials. However, BCARS encounters spectral distortion due to a setup-dependent non-resonant background (NRB). This study assesses BCARS reproducibility through a round robin experiment using two distinct BCARS setups and crystalline materials with varying structural complexity, including diamond, 6H-SiC, KDP, and KTP. The analysis compares setup-specific NRB correction procedures, detected and NRB-removed spectra, and mode assignment. We determine the influence of BCARS setup parameters like pump wavelength, pulse width, and detection geometry and provide a practical guide for optimizing BCARS setups for solid-state applications."}],"related_material":{"link":[{"url":"https://arxiv.org/abs/2306.09701","relation":"confirmation"}]},"article_number":"112","main_file_link":[{"open_access":"1","url":"https://arxiv.org/pdf/2306.09701.pdf"}],"language":[{"iso":"eng"}],"doi":"10.1364/ao.505374","title":"Comparing transmission- and epi-BCARS: a round robin on solid-state materials","year":"2024","publication_identifier":{"issn":["1559-128X","2155-3165"]},"author":[{"first_name":"Franz","last_name":"Hempel","full_name":"Hempel, Franz"},{"last_name":"Vernuccio","first_name":"Federico","full_name":"Vernuccio, Federico"},{"full_name":"König, Lukas","first_name":"Lukas","last_name":"König"},{"last_name":"Buschbeck","first_name":"Robin","full_name":"Buschbeck, Robin"},{"full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","first_name":"Michael","id":"22501"},{"full_name":"Cerullo, Giulio","first_name":"Giulio","last_name":"Cerullo"},{"full_name":"Polli, Dario","first_name":"Dario","last_name":"Polli"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."}],"publication_status":"published","date_updated":"2025-04-03T12:36:01Z","article_type":"original","intvolume":"        63"},{"publication":"Proceedings of The 14th International Conference on Metamaterials, Photonic Crystals and Plasmonics","citation":{"short":"H. Wetter, W. Gao, F. Rehberg, J. Wingenbach, S. Schumacher, T. Zentgraf, in: Proceedings of The 14th International Conference on Metamaterials, Photonic Crystals and Plasmonics, 2024.","chicago":"Wetter, Helene, Wenlong Gao, Falk Rehberg, Jan Wingenbach, Stefan Schumacher, and Thomas Zentgraf. “Dielectric Metasurface for Wave-Vector Variant and Circular Polarization Dependent Transmission.” In <i>Proceedings of The 14th International Conference on Metamaterials, Photonic Crystals and Plasmonics</i>, 2024.","ieee":"H. Wetter, W. Gao, F. Rehberg, J. Wingenbach, S. Schumacher, and T. Zentgraf, “Dielectric metasurface for wave-vector variant and circular polarization dependent transmission,” presented at the META 2024 - The 14th International Conference on Metamaterials, Photonic Crystals and Plasmonics, Toyama, Japan, 2024.","apa":"Wetter, H., Gao, W., Rehberg, F., Wingenbach, J., Schumacher, S., &#38; Zentgraf, T. (2024). Dielectric metasurface for wave-vector variant and circular polarization dependent transmission. <i>Proceedings of The 14th International Conference on Metamaterials, Photonic Crystals and Plasmonics</i>. META 2024 - The 14th International Conference on Metamaterials, Photonic Crystals and Plasmonics, Toyama, Japan.","bibtex":"@inproceedings{Wetter_Gao_Rehberg_Wingenbach_Schumacher_Zentgraf_2024, title={Dielectric metasurface for wave-vector variant and circular polarization dependent transmission}, booktitle={Proceedings of The 14th International Conference on Metamaterials, Photonic Crystals and Plasmonics}, author={Wetter, Helene and Gao, Wenlong and Rehberg, Falk and Wingenbach, Jan and Schumacher, Stefan and Zentgraf, Thomas}, year={2024} }","ama":"Wetter H, Gao W, Rehberg F, Wingenbach J, Schumacher S, Zentgraf T. Dielectric metasurface for wave-vector variant and circular polarization dependent transmission. In: <i>Proceedings of The 14th International Conference on Metamaterials, Photonic Crystals and Plasmonics</i>. ; 2024.","mla":"Wetter, Helene, et al. “Dielectric Metasurface for Wave-Vector Variant and Circular Polarization Dependent Transmission.” <i>Proceedings of The 14th International Conference on Metamaterials, Photonic Crystals and Plasmonics</i>, 2024."},"project":[{"name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","grant_number":"231447078","_id":"53"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"name":"TRR 142 - A09: TRR 142 - Erzeugung von Drei-Photonen-Zuständen mit On-Chip Pumplichtunterdrückung in topologischen Wellenleitern (A09*)","_id":"164","grant_number":"231447078"}],"date_created":"2025-05-23T06:30:36Z","type":"conference","department":[{"_id":"15"},{"_id":"230"},{"_id":"289"},{"_id":"623"}],"year":"2024","title":"Dielectric metasurface for wave-vector variant and circular polarization dependent transmission","status":"public","publication_identifier":{"issn":["2429-1390"]},"author":[{"first_name":"Helene","last_name":"Wetter","full_name":"Wetter, Helene"},{"first_name":"Wenlong","last_name":"Gao","full_name":"Gao, Wenlong"},{"first_name":"Falk","last_name":"Rehberg","full_name":"Rehberg, Falk"},{"id":"69187","first_name":"Jan","last_name":"Wingenbach","full_name":"Wingenbach, Jan"},{"id":"27271","full_name":"Schumacher, Stefan","orcid":"0000-0003-4042-4951","first_name":"Stefan","last_name":"Schumacher"},{"id":"30525","last_name":"Zentgraf","orcid":"0000-0002-8662-1101","first_name":"Thomas","full_name":"Zentgraf, Thomas"}],"conference":{"location":"Toyama, Japan","name":"META 2024 - The 14th International Conference on Metamaterials, Photonic Crystals and Plasmonics","start_date":"2024-07-16","end_date":"2024-07-19"},"date_updated":"2025-05-23T06:34:16Z","language":[{"iso":"eng"}],"_id":"60023","user_id":"30525"},{"type":"journal_article","department":[{"_id":"288"},{"_id":"623"},{"_id":"288"}],"date_created":"2024-09-27T11:46:59Z","project":[{"_id":"211","name":"QuICHE: Quanteninformation und Quantenkommunikation mit hochdimensionaler Informationskodierung (QuICHE)"}],"publication":"Optica Quantum","citation":{"mla":"Serino, Laura, et al. “Orchestrating Time and Color: A Programmable Source of High-Dimensional Entanglement.” <i>Optica Quantum</i>, Optica Publishing Group, 2024, doi:<a href=\"https://doi.org/10.1364/opticaq.532334\">10.1364/opticaq.532334</a>.","bibtex":"@article{Serino_Ridder_Bhattacharjee_Gil López_Brecht_Silberhorn_2024, title={Orchestrating time and color: a programmable source of high-dimensional entanglement}, DOI={<a href=\"https://doi.org/10.1364/opticaq.532334\">10.1364/opticaq.532334</a>}, journal={Optica Quantum}, publisher={Optica Publishing Group}, author={Serino, Laura and Ridder, Werner and Bhattacharjee, Abhinandan and Gil López, Jano and Brecht, Benjamin and Silberhorn, Christine}, year={2024} }","ama":"Serino L, Ridder W, Bhattacharjee A, Gil López J, Brecht B, Silberhorn C. Orchestrating time and color: a programmable source of high-dimensional entanglement. <i>Optica Quantum</i>. Published online 2024. doi:<a href=\"https://doi.org/10.1364/opticaq.532334\">10.1364/opticaq.532334</a>","ieee":"L. Serino, W. Ridder, A. Bhattacharjee, J. Gil López, B. Brecht, and C. Silberhorn, “Orchestrating time and color: a programmable source of high-dimensional entanglement,” <i>Optica Quantum</i>, 2024, doi: <a href=\"https://doi.org/10.1364/opticaq.532334\">10.1364/opticaq.532334</a>.","apa":"Serino, L., Ridder, W., Bhattacharjee, A., Gil López, J., Brecht, B., &#38; Silberhorn, C. (2024). Orchestrating time and color: a programmable source of high-dimensional entanglement. <i>Optica Quantum</i>. <a href=\"https://doi.org/10.1364/opticaq.532334\">https://doi.org/10.1364/opticaq.532334</a>","chicago":"Serino, Laura, Werner Ridder, Abhinandan Bhattacharjee, Jano Gil López, Benjamin Brecht, and Christine Silberhorn. “Orchestrating Time and Color: A Programmable Source of High-Dimensional Entanglement.” <i>Optica Quantum</i>, 2024. <a href=\"https://doi.org/10.1364/opticaq.532334\">https://doi.org/10.1364/opticaq.532334</a>.","short":"L. Serino, W. Ridder, A. Bhattacharjee, J. Gil López, B. Brecht, C. Silberhorn, Optica Quantum (2024)."},"doi":"10.1364/opticaq.532334","user_id":"63574","language":[{"iso":"eng"}],"_id":"56267","publisher":"Optica Publishing Group","date_updated":"2025-12-01T08:49:46Z","publication_status":"published","title":"Orchestrating time and color: a programmable source of high-dimensional entanglement","status":"public","year":"2024","publication_identifier":{"issn":["2837-6714"]},"author":[{"full_name":"Serino, Laura","first_name":"Laura","last_name":"Serino","id":"88242"},{"id":"63574","full_name":"Ridder, Werner","first_name":"Werner","last_name":"Ridder"},{"full_name":"Bhattacharjee, Abhinandan","last_name":"Bhattacharjee","first_name":"Abhinandan","id":"95902"},{"id":"51223","first_name":"Jano","last_name":"Gil López","full_name":"Gil López, Jano"},{"full_name":"Brecht, Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","first_name":"Benjamin","id":"27150"},{"full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine","id":"26263"}]},{"department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"790"},{"_id":"642"},{"_id":"286"},{"_id":"429"},{"_id":"230"},{"_id":"27"},{"_id":"35"},{"_id":"169"}],"type":"journal_article","date_created":"2024-06-24T09:46:25Z","project":[{"_id":"53","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"_id":"166","name":"TRR 142 - A11: TRR 142 - Subproject A11"},{"_id":"168","name":"TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"abstract":[{"text":"<jats:title>Abstract</jats:title><jats:p>Most properties of solid materials are defined by their internal electric field and charge density distributions which so far are difficult to measure with high spatial resolution. Especially for 2D materials, the atomic electric fields influence the optoelectronic properties. In this study, the atomic‐scale electric field and charge density distribution of WSe<jats:sub>2</jats:sub> bi‐ and trilayers are revealed using an emerging microscopy technique, differential phase contrast (DPC) imaging in scanning transmission electron microscopy (STEM). For pristine material, a higher positive charge density located at the selenium atomic columns compared to the tungsten atomic columns is obtained and tentatively explained by a coherent scattering effect. Furthermore, the change in the electric field distribution induced by a missing selenium atomic column is investigated. A characteristic electric field distribution in the vicinity of the defect with locally reduced magnitudes compared to the pristine lattice is observed. This effect is accompanied by a considerable inward relaxation of the surrounding lattice, which according to first principles DFT calculation is fully compatible with a missing column of Se atoms. This shows that DPC imaging, as an electric field sensitive technique, provides additional and remarkable information to the otherwise only structural analysis obtained with conventional STEM imaging.</jats:p>","lang":"eng"}],"citation":{"chicago":"Groll, Maja, Julius Bürger, Ioannis Caltzidis, Klaus D. Jöns, Wolf Gero Schmidt, Uwe Gerstmann, and Jörg K. N. Lindner. “DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging.” <i>Small</i>, 2024. <a href=\"https://doi.org/10.1002/smll.202311635\">https://doi.org/10.1002/smll.202311635</a>.","short":"M. Groll, J. Bürger, I. Caltzidis, K.D. Jöns, W.G. Schmidt, U. Gerstmann, J.K.N. Lindner, Small (2024).","ieee":"M. Groll <i>et al.</i>, “DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging,” <i>Small</i>, 2024, doi: <a href=\"https://doi.org/10.1002/smll.202311635\">10.1002/smll.202311635</a>.","apa":"Groll, M., Bürger, J., Caltzidis, I., Jöns, K. D., Schmidt, W. G., Gerstmann, U., &#38; Lindner, J. K. N. (2024). DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging. <i>Small</i>. <a href=\"https://doi.org/10.1002/smll.202311635\">https://doi.org/10.1002/smll.202311635</a>","bibtex":"@article{Groll_Bürger_Caltzidis_Jöns_Schmidt_Gerstmann_Lindner_2024, title={DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging}, DOI={<a href=\"https://doi.org/10.1002/smll.202311635\">10.1002/smll.202311635</a>}, journal={Small}, publisher={Wiley}, author={Groll, Maja and Bürger, Julius and Caltzidis, Ioannis and Jöns, Klaus D. and Schmidt, Wolf Gero and Gerstmann, Uwe and Lindner, Jörg K. N.}, year={2024} }","ama":"Groll M, Bürger J, Caltzidis I, et al. DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging. <i>Small</i>. Published online 2024. doi:<a href=\"https://doi.org/10.1002/smll.202311635\">10.1002/smll.202311635</a>","mla":"Groll, Maja, et al. “DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging.” <i>Small</i>, Wiley, 2024, doi:<a href=\"https://doi.org/10.1002/smll.202311635\">10.1002/smll.202311635</a>."},"publication":"Small","user_id":"16199","doi":"10.1002/smll.202311635","publisher":"Wiley","_id":"54868","language":[{"iso":"eng"}],"article_type":"original","publication_status":"published","date_updated":"2025-12-05T13:39:01Z","author":[{"last_name":"Groll","first_name":"Maja","full_name":"Groll, Maja"},{"first_name":"Julius","last_name":"Bürger","full_name":"Bürger, Julius","id":"46952"},{"id":"87911","first_name":"Ioannis","last_name":"Caltzidis","full_name":"Caltzidis, Ioannis"},{"full_name":"Jöns, Klaus D.","last_name":"Jöns","first_name":"Klaus D.","id":"85353"},{"id":"468","full_name":"Schmidt, Wolf Gero","last_name":"Schmidt","first_name":"Wolf Gero","orcid":"0000-0002-2717-5076"},{"id":"171","orcid":"0000-0002-4476-223X","last_name":"Gerstmann","first_name":"Uwe","full_name":"Gerstmann, Uwe"},{"id":"20797","full_name":"Lindner, Jörg K. N.","first_name":"Jörg K. N.","last_name":"Lindner"}],"publication_identifier":{"issn":["1613-6810","1613-6829"]},"title":"DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe<sub>2</sub> by Differential Phase Contrast Imaging","year":"2024","status":"public"},{"doi":"10.1002/qute.202300359","article_number":"2300359","language":[{"iso":"eng"}],"date_updated":"2025-12-11T13:00:06Z","publication_status":"published","intvolume":"         7","year":"2024","title":"Coherent Swing‐Up Excitation for Semiconductor Quantum Dots","author":[{"full_name":"Boos, Katarina","last_name":"Boos","first_name":"Katarina"},{"full_name":"Sbresny, Friedrich","last_name":"Sbresny","first_name":"Friedrich"},{"full_name":"Kim, Sang Kyu","last_name":"Kim","first_name":"Sang Kyu"},{"last_name":"Kremser","first_name":"Malte","full_name":"Kremser, Malte"},{"last_name":"Riedl","first_name":"Hubert","full_name":"Riedl, Hubert"},{"full_name":"Bopp, Frederik W.","last_name":"Bopp","first_name":"Frederik W."},{"full_name":"Rauhaus, William","first_name":"William","last_name":"Rauhaus"},{"last_name":"Scaparra","first_name":"Bianca","full_name":"Scaparra, Bianca"},{"full_name":"Jöns, Klaus","last_name":"Jöns","first_name":"Klaus","id":"85353"},{"full_name":"Finley, Jonathan J.","last_name":"Finley","first_name":"Jonathan J."},{"full_name":"Müller, Kai","last_name":"Müller","first_name":"Kai"},{"last_name":"Hanschke","first_name":"Lukas","full_name":"Hanschke, Lukas"}],"publication_identifier":{"issn":["2511-9044","2511-9044"]},"type":"journal_article","department":[{"_id":"623"},{"_id":"15"},{"_id":"429"},{"_id":"642"}],"date_created":"2025-12-04T12:08:46Z","abstract":[{"text":"<jats:title>Abstract</jats:title>\r\n                  <jats:p>Developing coherent excitation methods for quantum emitters ensuring high brightness, optimal single‐photon purity and indistinguishability of the emitted photons has been a key challenge in the past years. While various methods have been proposed and explored, they all have specific advantages and disadvantages. This study investigates the dynamics of the recent swing‐up scheme as an excitation method for a two‐level system and its performance in single‐photon generation. By applying two far red‐detuned laser pulses, the two‐level system can be prepared in the excited state with near‐unity fidelity. The successful operation and coherent character of this technique are demonstrated using a semiconductor quantum dot (QD). Moreover, the multi‐dimensional parameter space of the two laser pulses is explored to analyze its impact on excitation fidelity. Finally, the performance of the scheme as an excitation method for generating high‐quality single photons is analyzed. The swing‐up scheme itself proves effective, exhibiting nearly perfect single‐photon purity, while the observed indistinguishability in the studied sample is limited by the influence of the inevitable high excitation powers on the semiconductor environment of the quantum dot.</jats:p>","lang":"eng"}],"publication":"Advanced Quantum Technologies","issue":"4","user_id":"48188","volume":7,"_id":"62853","publisher":"Wiley","status":"public","citation":{"bibtex":"@article{Boos_Sbresny_Kim_Kremser_Riedl_Bopp_Rauhaus_Scaparra_Jöns_Finley_et al._2024, title={Coherent Swing‐Up Excitation for Semiconductor Quantum Dots}, volume={7}, DOI={<a href=\"https://doi.org/10.1002/qute.202300359\">10.1002/qute.202300359</a>}, number={42300359}, journal={Advanced Quantum Technologies}, publisher={Wiley}, author={Boos, Katarina and Sbresny, Friedrich and Kim, Sang Kyu and Kremser, Malte and Riedl, Hubert and Bopp, Frederik W. and Rauhaus, William and Scaparra, Bianca and Jöns, Klaus and Finley, Jonathan J. and et al.}, year={2024} }","ama":"Boos K, Sbresny F, Kim SK, et al. Coherent Swing‐Up Excitation for Semiconductor Quantum Dots. <i>Advanced Quantum Technologies</i>. 2024;7(4). doi:<a href=\"https://doi.org/10.1002/qute.202300359\">10.1002/qute.202300359</a>","short":"K. Boos, F. Sbresny, S.K. Kim, M. Kremser, H. Riedl, F.W. Bopp, W. Rauhaus, B. Scaparra, K. Jöns, J.J. Finley, K. Müller, L. Hanschke, Advanced Quantum Technologies 7 (2024).","chicago":"Boos, Katarina, Friedrich Sbresny, Sang Kyu Kim, Malte Kremser, Hubert Riedl, Frederik W. Bopp, William Rauhaus, et al. “Coherent Swing‐Up Excitation for Semiconductor Quantum Dots.” <i>Advanced Quantum Technologies</i> 7, no. 4 (2024). <a href=\"https://doi.org/10.1002/qute.202300359\">https://doi.org/10.1002/qute.202300359</a>.","ieee":"K. Boos <i>et al.</i>, “Coherent Swing‐Up Excitation for Semiconductor Quantum Dots,” <i>Advanced Quantum Technologies</i>, vol. 7, no. 4, Art. no. 2300359, 2024, doi: <a href=\"https://doi.org/10.1002/qute.202300359\">10.1002/qute.202300359</a>.","apa":"Boos, K., Sbresny, F., Kim, S. K., Kremser, M., Riedl, H., Bopp, F. W., Rauhaus, W., Scaparra, B., Jöns, K., Finley, J. J., Müller, K., &#38; Hanschke, L. (2024). Coherent Swing‐Up Excitation for Semiconductor Quantum Dots. <i>Advanced Quantum Technologies</i>, <i>7</i>(4), Article 2300359. <a href=\"https://doi.org/10.1002/qute.202300359\">https://doi.org/10.1002/qute.202300359</a>","mla":"Boos, Katarina, et al. “Coherent Swing‐Up Excitation for Semiconductor Quantum Dots.” <i>Advanced Quantum Technologies</i>, vol. 7, no. 4, 2300359, Wiley, 2024, doi:<a href=\"https://doi.org/10.1002/qute.202300359\">10.1002/qute.202300359</a>."}},{"title":"Experimental measurement of the reappearance of Rabi rotations in semiconductor quantum dots","status":"public","year":"2024","author":[{"first_name":"L.","last_name":"Hanschke","full_name":"Hanschke, L."},{"full_name":"Bracht, T. K.","first_name":"T. K.","last_name":"Bracht"},{"full_name":"Schöll, E.","first_name":"E.","last_name":"Schöll"},{"full_name":"Bauch, David","first_name":"David","last_name":"Bauch","id":"44172"},{"full_name":"Berger, Eva","first_name":"Eva","last_name":"Berger"},{"last_name":"Kallert","first_name":"Patricia","full_name":"Kallert, Patricia"},{"last_name":"Peter","first_name":"M.","full_name":"Peter, M."},{"first_name":"A. J.","last_name":"Garcia","full_name":"Garcia, A. J."},{"first_name":"S. F. Covre da","last_name":"Silva","full_name":"Silva, S. F. Covre da"},{"full_name":"Manna, S.","last_name":"Manna","first_name":"S."},{"full_name":"Rastelli, A.","first_name":"A.","last_name":"Rastelli"},{"id":"27271","last_name":"Schumacher","first_name":"Stefan","orcid":"0000-0003-4042-4951","full_name":"Schumacher, Stefan"},{"first_name":"D. E.","last_name":"Reiter","full_name":"Reiter, D. E."},{"id":"85353","full_name":"Jöns, Klaus","last_name":"Jöns","first_name":"Klaus"}],"date_updated":"2025-12-11T12:54:41Z","_id":"62858","language":[{"iso":"eng"}],"user_id":"48188","publication":"arXiv:2409.19167","citation":{"chicago":"Hanschke, L., T. K. Bracht, E. Schöll, David Bauch, Eva Berger, Patricia Kallert, M. Peter, et al. “Experimental Measurement of the Reappearance of Rabi Rotations in Semiconductor Quantum Dots.” <i>ArXiv:2409.19167</i>, 2024.","short":"L. Hanschke, T.K. Bracht, E. Schöll, D. Bauch, E. Berger, P. Kallert, M. Peter, A.J. Garcia, S.F.C. da Silva, S. Manna, A. Rastelli, S. Schumacher, D.E. Reiter, K. Jöns, ArXiv:2409.19167 (2024).","apa":"Hanschke, L., Bracht, T. K., Schöll, E., Bauch, D., Berger, E., Kallert, P., Peter, M., Garcia, A. J., Silva, S. F. C. da, Manna, S., Rastelli, A., Schumacher, S., Reiter, D. E., &#38; Jöns, K. (2024). Experimental measurement of the reappearance of Rabi rotations in semiconductor quantum dots. In <i>arXiv:2409.19167</i>.","ieee":"L. Hanschke <i>et al.</i>, “Experimental measurement of the reappearance of Rabi rotations in semiconductor quantum dots,” <i>arXiv:2409.19167</i>. 2024.","ama":"Hanschke L, Bracht TK, Schöll E, et al. Experimental measurement of the reappearance of Rabi rotations in semiconductor quantum dots. <i>arXiv:240919167</i>. Published online 2024.","bibtex":"@article{Hanschke_Bracht_Schöll_Bauch_Berger_Kallert_Peter_Garcia_Silva_Manna_et al._2024, title={Experimental measurement of the reappearance of Rabi rotations in semiconductor quantum dots}, journal={arXiv:2409.19167}, author={Hanschke, L. and Bracht, T. K. and Schöll, E. and Bauch, David and Berger, Eva and Kallert, Patricia and Peter, M. and Garcia, A. J. and Silva, S. F. Covre da and Manna, S. and et al.}, year={2024} }","mla":"Hanschke, L., et al. “Experimental Measurement of the Reappearance of Rabi Rotations in Semiconductor Quantum Dots.” <i>ArXiv:2409.19167</i>, 2024."},"abstract":[{"text":"Phonons in solid-state quantum emitters play a crucial role in their performance as photon sources in quantum technology. For resonant driving, phonons dampen the Rabi oscillations resulting in reduced preparation fidelities. The phonon spectral density, which quantifies the strength of the carrier-phonon interaction, is non-monotonous as a function of energy. As one of the most prominent consequences, this leads to the reappearance of Rabi rotations for increasing pulse power, which was theoretically predicted in Phys. Rev. Lett. 98, 227403 (2007). In this paper we present the experimental demonstration of the reappearance of Rabi rotations.","lang":"eng"}],"external_id":{"arxiv":["2409.19167"]},"date_created":"2025-12-04T12:16:58Z","type":"preprint","department":[{"_id":"623"},{"_id":"15"},{"_id":"429"},{"_id":"642"}]},{"_id":"62856","language":[{"iso":"eng"}],"user_id":"48188","status":"public","title":"Purcell-enhanced single-photon emission from InAs/GaAs quantum dots coupled to broadband cylindrical nanocavities","year":"2024","author":[{"id":"85353","first_name":"Klaus","last_name":"Jöns","full_name":"Jöns, Klaus"}],"date_updated":"2025-12-11T12:58:57Z","date_created":"2025-12-04T12:13:39Z","type":"preprint","department":[{"_id":"623"},{"_id":"15"},{"_id":"429"},{"_id":"642"}],"citation":{"mla":"Jöns, Klaus. <i>Purcell-Enhanced Single-Photon Emission from InAs/GaAs Quantum Dots Coupled to Broadband Cylindrical Nanocavities</i>. 2024.","bibtex":"@article{Jöns_2024, title={Purcell-enhanced single-photon emission from InAs/GaAs quantum dots coupled to broadband cylindrical nanocavities}, author={Jöns, Klaus}, year={2024} }","ama":"Jöns K. Purcell-enhanced single-photon emission from InAs/GaAs quantum dots coupled to broadband cylindrical nanocavities. Published online 2024.","ieee":"K. Jöns, “Purcell-enhanced single-photon emission from InAs/GaAs quantum dots coupled to broadband cylindrical nanocavities.” 2024.","apa":"Jöns, K. (2024). <i>Purcell-enhanced single-photon emission from InAs/GaAs quantum dots coupled to broadband cylindrical nanocavities</i>.","short":"K. Jöns, (2024).","chicago":"Jöns, Klaus. “Purcell-Enhanced Single-Photon Emission from InAs/GaAs Quantum Dots Coupled to Broadband Cylindrical Nanocavities,” 2024."},"abstract":[{"text":"On-chip emitters that can generate single and entangled photons are essential building blocks for developing photonic quantum information processing technologies in a scalable fashion. Semiconductor quantum dots (QDs) are attractive candidates that emit high-quality quantum states of light on demand, however at a rate limited by their spontaneous radiative lifetime. In this study, we utilize the Purcell effect to demonstrate up to a 38-fold enhancement in the emission rate of InAs QDs by coupling them to metal-clad GaAs nanopillars. These cavities, featuring a sub-wavelength mode volume of 4.5x10-4 (λ/n)3 and low quality factor of 62, enable Purcell-enhanced single-photon emission across a large bandwidth of 15 nm. The broadband nature of the cavity eliminates the need for implementing tuning mechanisms typically required to achieve QD-cavity resonance, thus relaxing fabrication constraints. Ultimately, this QD-cavity architecture represents a significant stride towards developing solid-state quantum emitters generating near-ideal single-photon states at GHz-level repetition rates.","lang":"eng"}]},{"abstract":[{"text":"<jats:p>The ability to apply user-chosen large-scale unitary operations with high fidelity to a quantum state is key to realizing future photonic quantum technologies. Here, we realize the implementation of programmable unitary operations on up to 64 frequency-bin modes. To benchmark the performance of our system, we probe different quantum walk unitary operations, in particular, Grover walks on four-dimensional hypercubes with similarities exceeding 95% and quantum walks with 400 steps on circles and finite lines with similarities of 98%. Our results open a path toward implementing high-quality unitary operations, which can form the basis for applications in complex tasks, such as Gaussian boson sampling.</jats:p>\r\n          <jats:sec>\r\n            <jats:title/>\r\n            <jats:supplementary-material>\r\n              <jats:permissions>\r\n                <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>\r\n                <jats:copyright-year>2024</jats:copyright-year>\r\n              </jats:permissions>\r\n            </jats:supplementary-material>\r\n          </jats:sec>","lang":"eng"}],"publication":"Physical Review Research","issue":"2","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"type":"journal_article","date_created":"2024-05-14T12:40:48Z","intvolume":"         6","publication_status":"published","date_updated":"2025-12-18T16:14:39Z","publication_identifier":{"issn":["2643-1564"]},"author":[{"full_name":"De, Syamsundar","first_name":"Syamsundar","last_name":"De"},{"full_name":"Ansari, Vahid","last_name":"Ansari","first_name":"Vahid"},{"id":"75127","first_name":"Jan","last_name":"Sperling","orcid":"0000-0002-5844-3205","full_name":"Sperling, Jan"},{"full_name":"Barkhofen, Sonja","first_name":"Sonja","last_name":"Barkhofen","id":"48188"},{"id":"27150","full_name":"Brecht, Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","first_name":"Benjamin"},{"full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine","id":"26263"}],"title":"Realization of high-fidelity unitary operations on up to 64 frequency bins","year":"2024","doi":"10.1103/physrevresearch.6.l022040","language":[{"iso":"eng"}],"article_number":"L022040","project":[{"_id":"216","name":"QuPoPCoRN: QUPOPCORN: Quantum Particles on Programmable Complex Reconfigurable Networks"}],"citation":{"apa":"De, S., Ansari, V., Sperling, J., Barkhofen, S., Brecht, B., &#38; Silberhorn, C. (2024). Realization of high-fidelity unitary operations on up to 64 frequency bins. <i>Physical Review Research</i>, <i>6</i>(2), Article L022040. <a href=\"https://doi.org/10.1103/physrevresearch.6.l022040\">https://doi.org/10.1103/physrevresearch.6.l022040</a>","ieee":"S. De, V. Ansari, J. Sperling, S. Barkhofen, B. Brecht, and C. Silberhorn, “Realization of high-fidelity unitary operations on up to 64 frequency bins,” <i>Physical Review Research</i>, vol. 6, no. 2, Art. no. L022040, 2024, doi: <a href=\"https://doi.org/10.1103/physrevresearch.6.l022040\">10.1103/physrevresearch.6.l022040</a>.","chicago":"De, Syamsundar, Vahid Ansari, Jan Sperling, Sonja Barkhofen, Benjamin Brecht, and Christine Silberhorn. “Realization of High-Fidelity Unitary Operations on up to 64 Frequency Bins.” <i>Physical Review Research</i> 6, no. 2 (2024). <a href=\"https://doi.org/10.1103/physrevresearch.6.l022040\">https://doi.org/10.1103/physrevresearch.6.l022040</a>.","short":"S. De, V. Ansari, J. Sperling, S. Barkhofen, B. Brecht, C. Silberhorn, Physical Review Research 6 (2024).","mla":"De, Syamsundar, et al. “Realization of High-Fidelity Unitary Operations on up to 64 Frequency Bins.” <i>Physical Review Research</i>, vol. 6, no. 2, L022040, American Physical Society (APS), 2024, doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.l022040\">10.1103/physrevresearch.6.l022040</a>.","ama":"De S, Ansari V, Sperling J, Barkhofen S, Brecht B, Silberhorn C. Realization of high-fidelity unitary operations on up to 64 frequency bins. <i>Physical Review Research</i>. 2024;6(2). doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.l022040\">10.1103/physrevresearch.6.l022040</a>","bibtex":"@article{De_Ansari_Sperling_Barkhofen_Brecht_Silberhorn_2024, title={Realization of high-fidelity unitary operations on up to 64 frequency bins}, volume={6}, DOI={<a href=\"https://doi.org/10.1103/physrevresearch.6.l022040\">10.1103/physrevresearch.6.l022040</a>}, number={2L022040}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={De, Syamsundar and Ansari, Vahid and Sperling, Jan and Barkhofen, Sonja and Brecht, Benjamin and Silberhorn, Christine}, year={2024} }"},"status":"public","volume":6,"user_id":"27150","publisher":"American Physical Society (APS)","_id":"54288"},{"citation":{"short":"R. Pollmann, F. Roeder, V. Quiring, R. Ricken, C. Eigner, B. Brecht, C. Silberhorn, Optics Express 32 (2024).","chicago":"Pollmann, René, Franz Roeder, Victor Quiring, Raimund Ricken, Christof Eigner, Benjamin Brecht, and Christine Silberhorn. “Integrated, Bright Broadband, Two-Colour Parametric down-Conversion Source.” <i>Optics Express</i> 32, no. 14 (2024). <a href=\"https://doi.org/10.1364/oe.522549\">https://doi.org/10.1364/oe.522549</a>.","apa":"Pollmann, R., Roeder, F., Quiring, V., Ricken, R., Eigner, C., Brecht, B., &#38; Silberhorn, C. (2024). Integrated, bright broadband, two-colour parametric down-conversion source. <i>Optics Express</i>, <i>32</i>(14), Article 23945. <a href=\"https://doi.org/10.1364/oe.522549\">https://doi.org/10.1364/oe.522549</a>","ieee":"R. Pollmann <i>et al.</i>, “Integrated, bright broadband, two-colour parametric down-conversion source,” <i>Optics Express</i>, vol. 32, no. 14, Art. no. 23945, 2024, doi: <a href=\"https://doi.org/10.1364/oe.522549\">10.1364/oe.522549</a>.","ama":"Pollmann R, Roeder F, Quiring V, et al. Integrated, bright broadband, two-colour parametric down-conversion source. <i>Optics Express</i>. 2024;32(14). doi:<a href=\"https://doi.org/10.1364/oe.522549\">10.1364/oe.522549</a>","bibtex":"@article{Pollmann_Roeder_Quiring_Ricken_Eigner_Brecht_Silberhorn_2024, title={Integrated, bright broadband, two-colour parametric down-conversion source}, volume={32}, DOI={<a href=\"https://doi.org/10.1364/oe.522549\">10.1364/oe.522549</a>}, number={1423945}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Pollmann, René and Roeder, Franz and Quiring, Victor and Ricken, Raimund and Eigner, Christof and Brecht, Benjamin and Silberhorn, Christine}, year={2024} }","mla":"Pollmann, René, et al. “Integrated, Bright Broadband, Two-Colour Parametric down-Conversion Source.” <i>Optics Express</i>, vol. 32, no. 14, 23945, Optica Publishing Group, 2024, doi:<a href=\"https://doi.org/10.1364/oe.522549\">10.1364/oe.522549</a>."},"volume":32,"user_id":"78890","_id":"54815","publisher":"Optica Publishing Group","status":"public","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"type":"journal_article","date_created":"2024-06-19T06:58:17Z","abstract":[{"text":"<jats:p>Broadband quantum light is a vital resource for quantum metrology and spectroscopy applications such as quantum optical coherence tomography or entangled two photon absorption. For entangled two photon absorption in particular, very high photon flux combined with high time-frequency entanglement is crucial for observing a signal. So far these conditions could be met by using high power lasers driving degenerate, type 0 bulk-crystal spontaneous parametric down conversion (SPDC) sources. This naturally limits the available wavelength ranges and precludes deterministic splitting of the generated output photons. In this work we demonstrate an integrated two-colour SPDC source utilising a group-velocity matched lithium niobate waveguide, reaching both exceptional brightness 1.52⋅10<jats:sup>6</jats:sup>pairssmWGHz and large bandwidth (7.8 THz FWHM) while pumped with a few mW of continuous wave (CW) laser light. By converting a narrow band pump to broadband pulses the created photon pairs show correlation times of Δ<jats:italic>τ</jats:italic> ≈ 120 fs while maintaining the narrow bandwidth Δ<jats:italic>ω</jats:italic><jats:sub>\r\n      <jats:italic>p</jats:italic>\r\n    </jats:sub> ≪ 1 MHz of the CW pump light, yielding strong time-frequency entanglement. Furthermore our process can be adapted to a wide range of central wavelengths.</jats:p>","lang":"eng"}],"issue":"14","publication":"Optics Express","doi":"10.1364/oe.522549","language":[{"iso":"eng"}],"article_number":"23945","intvolume":"        32","article_type":"original","date_updated":"2025-12-19T11:37:41Z","publication_status":"published","author":[{"last_name":"Pollmann","first_name":"René","full_name":"Pollmann, René","id":"78890"},{"last_name":"Roeder","first_name":"Franz","full_name":"Roeder, Franz","id":"88149"},{"last_name":"Quiring","first_name":"Victor","full_name":"Quiring, Victor"},{"full_name":"Ricken, Raimund","first_name":"Raimund","last_name":"Ricken"},{"id":"13244","orcid":"https://orcid.org/0000-0002-5693-3083","first_name":"Christof","last_name":"Eigner","full_name":"Eigner, Christof"},{"id":"27150","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","first_name":"Benjamin","full_name":"Brecht, Benjamin"},{"id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine"}],"publication_identifier":{"issn":["1094-4087"]},"title":"Integrated, bright broadband, two-colour parametric down-conversion source","year":"2024"},{"type":"journal_article","department":[{"_id":"288"},{"_id":"623"},{"_id":"15"}],"date_created":"2024-12-27T19:01:14Z","abstract":[{"text":"The latest applications in ultrafast quantum metrology require bright, broadband bi-photon sources with one of the photons in the mid-infrared and the other in the visible to near infrared. However, existing sources based on bulk crystals are limited in brightness due to the short interaction length and only allow for limited dispersion engineering. Here, we present an integrated PDC source based on a Ti:LiNbO3 waveguide that generates broadband bi-photons with central wavelengths at 860 nm and 2800 nm. Their spectral bandwidth exceeds 25 THz and is achieved by simultaneous matching of the group velocities (GVs) and cancellation of GV dispersion for the signal and idler field. We provide an intuitive understanding of the process by studying our source’s behavior at different temperatures and pump wavelengths, which agrees well with simulations.","lang":"eng"}],"issue":"12","publication":"New Journal of Physics","doi":"10.1088/1367-2630/ad9f98","article_number":"123025","language":[{"iso":"eng"}],"date_updated":"2025-12-19T11:36:36Z","publication_status":"published","intvolume":"        26","article_type":"original","year":"2024","title":"Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared","author":[{"first_name":"Franz","last_name":"Roeder","full_name":"Roeder, Franz","id":"88149"},{"first_name":"Abira","last_name":"Gnanavel","full_name":"Gnanavel, Abira"},{"full_name":"Pollmann, René","last_name":"Pollmann","first_name":"René","id":"78890"},{"first_name":"Olga","last_name":"Brecht","full_name":"Brecht, Olga"},{"id":"42777","full_name":"Stefszky, Michael","first_name":"Michael","last_name":"Stefszky"},{"full_name":"Padberg, Laura","last_name":"Padberg","first_name":"Laura","id":"40300"},{"last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","first_name":"Christof","full_name":"Eigner, Christof","id":"13244"},{"id":"26263","full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn"},{"id":"27150","full_name":"Brecht, Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","first_name":"Benjamin"}],"publication_identifier":{"issn":["1367-2630"]},"project":[{"name":"MIRAQLS: MIRAQLS: Mid-infrared Quantum Technology for Sensing","_id":"571"},{"name":"E2TPA: Exploiting Entangled Two-Photon Absorption","_id":"190"}],"citation":{"bibtex":"@article{Roeder_Gnanavel_Pollmann_Brecht_Stefszky_Padberg_Eigner_Silberhorn_Brecht_2024, title={Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared}, volume={26}, DOI={<a href=\"https://doi.org/10.1088/1367-2630/ad9f98\">10.1088/1367-2630/ad9f98</a>}, number={12123025}, journal={New Journal of Physics}, publisher={IOP Publishing}, author={Roeder, Franz and Gnanavel, Abira and Pollmann, René and Brecht, Olga and Stefszky, Michael and Padberg, Laura and Eigner, Christof and Silberhorn, Christine and Brecht, Benjamin}, year={2024} }","ama":"Roeder F, Gnanavel A, Pollmann R, et al. Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared. <i>New Journal of Physics</i>. 2024;26(12). doi:<a href=\"https://doi.org/10.1088/1367-2630/ad9f98\">10.1088/1367-2630/ad9f98</a>","mla":"Roeder, Franz, et al. “Ultra-Broadband Non-Degenerate Guided-Wave Bi-Photon Source in the near and Mid-Infrared.” <i>New Journal of Physics</i>, vol. 26, no. 12, 123025, IOP Publishing, 2024, doi:<a href=\"https://doi.org/10.1088/1367-2630/ad9f98\">10.1088/1367-2630/ad9f98</a>.","chicago":"Roeder, Franz, Abira Gnanavel, René Pollmann, Olga Brecht, Michael Stefszky, Laura Padberg, Christof Eigner, Christine Silberhorn, and Benjamin Brecht. “Ultra-Broadband Non-Degenerate Guided-Wave Bi-Photon Source in the near and Mid-Infrared.” <i>New Journal of Physics</i> 26, no. 12 (2024). <a href=\"https://doi.org/10.1088/1367-2630/ad9f98\">https://doi.org/10.1088/1367-2630/ad9f98</a>.","short":"F. Roeder, A. Gnanavel, R. Pollmann, O. Brecht, M. Stefszky, L. Padberg, C. Eigner, C. Silberhorn, B. Brecht, New Journal of Physics 26 (2024).","ieee":"F. Roeder <i>et al.</i>, “Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared,” <i>New Journal of Physics</i>, vol. 26, no. 12, Art. no. 123025, 2024, doi: <a href=\"https://doi.org/10.1088/1367-2630/ad9f98\">10.1088/1367-2630/ad9f98</a>.","apa":"Roeder, F., Gnanavel, A., Pollmann, R., Brecht, O., Stefszky, M., Padberg, L., Eigner, C., Silberhorn, C., &#38; Brecht, B. (2024). Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared. <i>New Journal of Physics</i>, <i>26</i>(12), Article 123025. <a href=\"https://doi.org/10.1088/1367-2630/ad9f98\">https://doi.org/10.1088/1367-2630/ad9f98</a>"},"user_id":"78890","volume":26,"publisher":"IOP Publishing","_id":"57862","status":"public"}]