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Kirbus, S. D. Seddon, I. Kiseleva, E. Beyreuther, M. Rüsing, and L. M. Eng, “Probing ferroelectric phase transitions in barium titanate single crystals via in-situ second harmonic generation microscopy,” <i>Journal of Applied Physics</i>, vol. 136, no. 15, Art. no. 154102, 2024, doi: <a href=\"https://doi.org/10.1063/5.0237769\">10.1063/5.0237769</a>.","ama":"Kirbus B, Seddon SD, Kiseleva I, Beyreuther E, Rüsing M, Eng LM. Probing ferroelectric phase transitions in barium titanate single crystals via in-situ second harmonic generation microscopy. <i>Journal of Applied Physics</i>. 2024;136(15). doi:<a href=\"https://doi.org/10.1063/5.0237769\">10.1063/5.0237769</a>","short":"B. Kirbus, S.D. Seddon, I. Kiseleva, E. Beyreuther, M. Rüsing, L.M. Eng, Journal of Applied Physics 136 (2024).","bibtex":"@article{Kirbus_Seddon_Kiseleva_Beyreuther_Rüsing_Eng_2024, title={Probing ferroelectric phase transitions in barium titanate single crystals via in-situ second harmonic generation microscopy}, volume={136}, DOI={<a href=\"https://doi.org/10.1063/5.0237769\">10.1063/5.0237769</a>}, number={15154102}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Kirbus, Benjamin and Seddon, Samuel D. and Kiseleva, Iuliia and Beyreuther, Elke and Rüsing, Michael and Eng, Lukas M.}, year={2024} }","mla":"Kirbus, Benjamin, et al. “Probing Ferroelectric Phase Transitions in Barium Titanate Single Crystals via In-Situ Second Harmonic Generation Microscopy.” <i>Journal of Applied Physics</i>, vol. 136, no. 15, 154102, AIP Publishing, 2024, doi:<a href=\"https://doi.org/10.1063/5.0237769\">10.1063/5.0237769</a>.","apa":"Kirbus, B., Seddon, S. D., Kiseleva, I., Beyreuther, E., Rüsing, M., &#38; Eng, L. M. (2024). Probing ferroelectric phase transitions in barium titanate single crystals via in-situ second harmonic generation microscopy. <i>Journal of Applied Physics</i>, <i>136</i>(15), Article 154102. <a href=\"https://doi.org/10.1063/5.0237769\">https://doi.org/10.1063/5.0237769</a>"},"volume":136,"author":[{"first_name":"Benjamin","full_name":"Kirbus, Benjamin","last_name":"Kirbus"},{"first_name":"Samuel D.","last_name":"Seddon","full_name":"Seddon, Samuel D."},{"first_name":"Iuliia","full_name":"Kiseleva, Iuliia","last_name":"Kiseleva"},{"last_name":"Beyreuther","full_name":"Beyreuther, Elke","first_name":"Elke"},{"first_name":"Michael","id":"22501","full_name":"Rüsing, Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577"},{"last_name":"Eng","full_name":"Eng, Lukas M.","first_name":"Lukas M."}],"date_updated":"2025-04-02T15:59:55Z","oa":"1","doi":"10.1063/5.0237769","main_file_link":[{"url":" https://doi.org/10.1063/5.0237769","open_access":"1"}],"type":"journal_article","status":"public","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"user_id":"22501","_id":"59269","article_number":"154102","article_type":"original","issue":"15","quality_controlled":"1","year":"2024","date_created":"2025-04-02T15:57:11Z","publisher":"AIP Publishing","title":"Probing ferroelectric phase transitions in barium titanate single crystals via in-situ second harmonic generation microscopy","publication":"Journal of Applied Physics","abstract":[{"text":"Ferroelectric materials play a crucial role in a broad range of technologies due to their unique properties that are deeply connected to the pattern and behavior of their ferroelectric (FE) domains. Chief among them, barium titanate (BaTiO3; BTO) sees widespread applications such as in electronics but equally is a ferroelectric model system for fundamental research, e.g., to study the interplay of such FE domains, the domain walls (DWs), and their macroscopic properties, owed to BTO’s multiple and experimentally accessible phase transitions. Here, we employ Second Harmonic Generation Microscopy (SHGM) to in situ investigate the cubic-to-tetragonal (at ∼126°C) and the tetragonal-to-orthorhombic (at ∼5°C) phase transition in single-crystalline BTO via three-dimensional (3D) DW mapping. We demonstrate that SHGM imaging provides the direct visualization of FE domain switching as well as the domain dynamics in 3D, shedding light on the interplay of the domain structure and phase transition. These results allow us to extract the different transition temperatures locally, to unveil the hysteresis behavior, and to determine the type of phase transition at play (first/second order) from the recorded SHGM data. The capabilities of SHGM in uncovering these crucial phenomena can easily be applied to other ferroelectrics to provide new possibilities for in situ engineering of advanced ferroic devices.","lang":"eng"}],"language":[{"iso":"eng"}]},{"publisher":"Wiley","date_created":"2025-04-02T16:04:58Z","title":"Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment","issue":"1","year":"2024","language":[{"iso":"eng"}],"publication":"physica status solidi (a)","abstract":[{"text":"Lithium niobate (LNO) and lithium tantalate (LTO) see widespread use in fundamental research and commercial technologies reaching from electronics over classical optics to integrated quantum communication. The mixed crystal system lithium niobate tantalate (LNT) allows for the dedicate engineering of material properties by combining the advantages of the two parental materials LNO and LTO. Vibrational spectroscopies such as Raman spectroscopy or (Fourier transform) infrared (IR) spectroscopy are vital techniques to provide detailed insight into the material properties, which is central to the analysis and optimization of devices. This work presents a joint experimental–theoretical approach allowing to unambiguously assign the spectral features in the LNT material family through both Raman and IR spectroscopy, as well as providing an in‐depth explanation for the observed scattering efficiencies based on first‐principles calculations. The phononic contribution to the static dielectric tensor is calculated from the experimental and theoretical data using the generalized Lyddane–Sachs–Teller relation and compared with the results of the first‐principles calculations.","lang":"eng"}],"oa":"1","date_updated":"2025-04-02T16:07:19Z","volume":222,"author":[{"last_name":"Bernhardt","full_name":"Bernhardt, Felix","first_name":"Felix"},{"full_name":"Gharat, Soham","last_name":"Gharat","first_name":"Soham"},{"last_name":"Kapp","full_name":"Kapp, Alexander","first_name":"Alexander"},{"first_name":"Florian","last_name":"Pfeiffer","full_name":"Pfeiffer, Florian"},{"first_name":"Robin","last_name":"Buschbeck","full_name":"Buschbeck, Robin"},{"full_name":"Hempel, Franz","last_name":"Hempel","first_name":"Franz"},{"last_name":"Pashkin","full_name":"Pashkin, Oleksiy","first_name":"Oleksiy"},{"full_name":"Kehr, Susanne C.","last_name":"Kehr","first_name":"Susanne C."},{"first_name":"Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","id":"22501","full_name":"Rüsing, Michael"},{"first_name":"Simone","full_name":"Sanna, Simone","last_name":"Sanna"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."}],"doi":"10.1002/pssa.202300968","main_file_link":[{"url":"https://doi.org/10.1002/pssa.202300968","open_access":"1"}],"publication_identifier":{"issn":["1862-6300","1862-6319"]},"publication_status":"published","intvolume":"       222","page":"2300968","citation":{"apa":"Bernhardt, F., Gharat, S., Kapp, A., Pfeiffer, F., Buschbeck, R., Hempel, F., Pashkin, O., Kehr, S. C., Rüsing, M., Sanna, S., &#38; Eng, L. M. (2024). Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment. <i>Physica Status Solidi (a)</i>, <i>222</i>(1), 2300968. <a href=\"https://doi.org/10.1002/pssa.202300968\">https://doi.org/10.1002/pssa.202300968</a>","mla":"Bernhardt, Felix, et al. “Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment.” <i>Physica Status Solidi (a)</i>, vol. 222, no. 1, Wiley, 2024, p. 2300968, doi:<a href=\"https://doi.org/10.1002/pssa.202300968\">10.1002/pssa.202300968</a>.","short":"F. Bernhardt, S. Gharat, A. Kapp, F. Pfeiffer, R. Buschbeck, F. Hempel, O. Pashkin, S.C. Kehr, M. Rüsing, S. Sanna, L.M. Eng, Physica Status Solidi (a) 222 (2024) 2300968.","bibtex":"@article{Bernhardt_Gharat_Kapp_Pfeiffer_Buschbeck_Hempel_Pashkin_Kehr_Rüsing_Sanna_et al._2024, title={Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment}, volume={222}, DOI={<a href=\"https://doi.org/10.1002/pssa.202300968\">10.1002/pssa.202300968</a>}, number={1}, journal={physica status solidi (a)}, publisher={Wiley}, author={Bernhardt, Felix and Gharat, Soham and Kapp, Alexander and Pfeiffer, Florian and Buschbeck, Robin and Hempel, Franz and Pashkin, Oleksiy and Kehr, Susanne C. and Rüsing, Michael and Sanna, Simone and et al.}, year={2024}, pages={2300968} }","ama":"Bernhardt F, Gharat S, Kapp A, et al. Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment. <i>physica status solidi (a)</i>. 2024;222(1):2300968. doi:<a href=\"https://doi.org/10.1002/pssa.202300968\">10.1002/pssa.202300968</a>","chicago":"Bernhardt, Felix, Soham Gharat, Alexander Kapp, Florian Pfeiffer, Robin Buschbeck, Franz Hempel, Oleksiy Pashkin, et al. “Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment.” <i>Physica Status Solidi (a)</i> 222, no. 1 (2024): 2300968. <a href=\"https://doi.org/10.1002/pssa.202300968\">https://doi.org/10.1002/pssa.202300968</a>.","ieee":"F. Bernhardt <i>et al.</i>, “Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment,” <i>physica status solidi (a)</i>, vol. 222, no. 1, p. 2300968, 2024, doi: <a href=\"https://doi.org/10.1002/pssa.202300968\">10.1002/pssa.202300968</a>."},"_id":"59271","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"user_id":"22501","type":"journal_article","status":"public"},{"status":"public","type":"journal_article","article_type":"original","article_number":"176549","department":[{"_id":"15"},{"_id":"288"},{"_id":"623"}],"user_id":"22501","_id":"59270","intvolume":"      1008","citation":{"chicago":"Bashir, Umar, Michael Rüsing, Detlef Klimm, Roberts Blukis, Boris Koppitz, Lukas M. Eng, Matthias Bickermann, and Steffen Ganschow. “Thermal Conductivity in Solid Solutions of Lithium Niobate Tantalate Single Crystals from 300 K up to 1300 K.” <i>Journal of Alloys and Compounds</i> 1008 (2024). <a href=\"https://doi.org/10.1016/j.jallcom.2024.176549\">https://doi.org/10.1016/j.jallcom.2024.176549</a>.","ieee":"U. Bashir <i>et al.</i>, “Thermal conductivity in solid solutions of lithium niobate tantalate single crystals from 300 K up to 1300 K,” <i>Journal of Alloys and Compounds</i>, vol. 1008, Art. no. 176549, 2024, doi: <a href=\"https://doi.org/10.1016/j.jallcom.2024.176549\">10.1016/j.jallcom.2024.176549</a>.","ama":"Bashir U, Rüsing M, Klimm D, et al. Thermal conductivity in solid solutions of lithium niobate tantalate single crystals from 300 K up to 1300 K. <i>Journal of Alloys and Compounds</i>. 2024;1008. doi:<a href=\"https://doi.org/10.1016/j.jallcom.2024.176549\">10.1016/j.jallcom.2024.176549</a>","apa":"Bashir, U., Rüsing, M., Klimm, D., Blukis, R., Koppitz, B., Eng, L. M., Bickermann, M., &#38; Ganschow, S. (2024). Thermal conductivity in solid solutions of lithium niobate tantalate single crystals from 300 K up to 1300 K. <i>Journal of Alloys and Compounds</i>, <i>1008</i>, Article 176549. <a href=\"https://doi.org/10.1016/j.jallcom.2024.176549\">https://doi.org/10.1016/j.jallcom.2024.176549</a>","mla":"Bashir, Umar, et al. “Thermal Conductivity in Solid Solutions of Lithium Niobate Tantalate Single Crystals from 300 K up to 1300 K.” <i>Journal of Alloys and Compounds</i>, vol. 1008, 176549, Elsevier BV, 2024, doi:<a href=\"https://doi.org/10.1016/j.jallcom.2024.176549\">10.1016/j.jallcom.2024.176549</a>.","bibtex":"@article{Bashir_Rüsing_Klimm_Blukis_Koppitz_Eng_Bickermann_Ganschow_2024, title={Thermal conductivity in solid solutions of lithium niobate tantalate single crystals from 300 K up to 1300 K}, volume={1008}, DOI={<a href=\"https://doi.org/10.1016/j.jallcom.2024.176549\">10.1016/j.jallcom.2024.176549</a>}, number={176549}, journal={Journal of Alloys and Compounds}, publisher={Elsevier BV}, author={Bashir, Umar and Rüsing, Michael and Klimm, Detlef and Blukis, Roberts and Koppitz, Boris and Eng, Lukas M. and Bickermann, Matthias and Ganschow, Steffen}, year={2024} }","short":"U. Bashir, M. Rüsing, D. Klimm, R. Blukis, B. Koppitz, L.M. Eng, M. Bickermann, S. Ganschow, Journal of Alloys and Compounds 1008 (2024)."},"publication_identifier":{"issn":["0925-8388"]},"publication_status":"published","doi":"10.1016/j.jallcom.2024.176549","volume":1008,"author":[{"first_name":"Umar","full_name":"Bashir, Umar","last_name":"Bashir"},{"last_name":"Rüsing","orcid":"0000-0003-4682-4577","id":"22501","full_name":"Rüsing, Michael","first_name":"Michael"},{"last_name":"Klimm","full_name":"Klimm, Detlef","first_name":"Detlef"},{"last_name":"Blukis","full_name":"Blukis, Roberts","first_name":"Roberts"},{"full_name":"Koppitz, Boris","last_name":"Koppitz","first_name":"Boris"},{"full_name":"Eng, Lukas M.","last_name":"Eng","first_name":"Lukas M."},{"first_name":"Matthias","last_name":"Bickermann","full_name":"Bickermann, Matthias"},{"last_name":"Ganschow","full_name":"Ganschow, Steffen","first_name":"Steffen"}],"date_updated":"2025-04-02T16:02:26Z","abstract":[{"lang":"eng","text":"Lithium niobate tantalate (LiNb1−xTaxO3, LNT) solid solutions offer exciting new possibilities for applications ranging from optics, piezotronics, and electronics beyond the capabilities of the widely used singular compounds of lithium niobate (LiNbO3, LN) or lithium tantalate (LiTaO3, LT). Crystal growth of homogeneous LNT single crystals by the Czochralski method is still challenging. One key aspect of homogeneous growth is the accurate knowledge of thermal conductivity through the crystal boule during the growth, which is central to control the crystal growth. Therefore, the temperature dependent thermal conductivity of pure LN, LT, and LNT solid solutions, as well as of selected doped LN and LT crystals (Mg, Zn) was investigated across the temperature range from 300 to 1300 K. The results that span across the whole composition range can directly be applied for optimizing growth conditions of both LNT solid solutions as well as doped and undoped LN and LT crystals."}],"publication":"Journal of Alloys and Compounds","language":[{"iso":"eng"}],"year":"2024","quality_controlled":"1","title":"Thermal conductivity in solid solutions of lithium niobate tantalate single crystals from 300 K up to 1300 K","date_created":"2025-04-02T16:00:56Z","publisher":"Elsevier BV"},{"_id":"59272","user_id":"22501","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"article_number":"L042015","language":[{"iso":"eng"}],"type":"journal_article","publication":"Physical Review Research","abstract":[{"text":"Ferroelectrics such as LiNbO3 (LN) are wide-band-gap insulators that may show a high local electric conductivity at the domain walls (DWs). The latter are interfaces separating regions of noncollinear polarization, which can be manipulated to build integrated nanoelectronic elements. In the present work, we model different DW types in LN from first principles. Our models reveal the DW morphology and shed light on their electronic properties: A strong band bending is predicted for charged DWs, leading to local metallicity. Defect trapping at the DW may further enhance the electric conductivity.","lang":"eng"}],"status":"public","publisher":"American Physical Society (APS)","date_updated":"2025-04-02T16:10:59Z","date_created":"2025-04-02T16:08:55Z","author":[{"first_name":"Leonard M.","last_name":"Verhoff","full_name":"Verhoff, Leonard M."},{"full_name":"Pionteck, Mike N.","last_name":"Pionteck","first_name":"Mike N."},{"first_name":"Michael","id":"22501","full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing"},{"first_name":"Holger","last_name":"Fritze","full_name":"Fritze, Holger"},{"full_name":"Eng, Lukas M.","last_name":"Eng","first_name":"Lukas M."},{"last_name":"Sanna","full_name":"Sanna, Simone","first_name":"Simone"}],"volume":6,"title":"Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls","main_file_link":[{"url":"https://jlupub.ub.uni-giessen.de/server/api/core/bitstreams/fb2b09e6-c0f8-4209-99a1-79fc81d9b1f9/content"}],"doi":"10.1103/physrevresearch.6.l042015","publication_status":"published","publication_identifier":{"issn":["2643-1564"]},"issue":"4","year":"2024","citation":{"mla":"Verhoff, Leonard M., et al. “Two-Dimensional Electronic Conductivity in Insulating Ferroelectrics: Peculiar Properties of Domain Walls.” <i>Physical Review Research</i>, vol. 6, no. 4, L042015, American Physical Society (APS), 2024, doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.l042015\">10.1103/physrevresearch.6.l042015</a>.","bibtex":"@article{Verhoff_Pionteck_Rüsing_Fritze_Eng_Sanna_2024, title={Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls}, volume={6}, DOI={<a href=\"https://doi.org/10.1103/physrevresearch.6.l042015\">10.1103/physrevresearch.6.l042015</a>}, number={4L042015}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Verhoff, Leonard M. and Pionteck, Mike N. and Rüsing, Michael and Fritze, Holger and Eng, Lukas M. and Sanna, Simone}, year={2024} }","short":"L.M. Verhoff, M.N. Pionteck, M. Rüsing, H. Fritze, L.M. Eng, S. Sanna, Physical Review Research 6 (2024).","apa":"Verhoff, L. M., Pionteck, M. N., Rüsing, M., Fritze, H., Eng, L. M., &#38; Sanna, S. (2024). Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls. <i>Physical Review Research</i>, <i>6</i>(4), Article L042015. <a href=\"https://doi.org/10.1103/physrevresearch.6.l042015\">https://doi.org/10.1103/physrevresearch.6.l042015</a>","ieee":"L. M. Verhoff, M. N. Pionteck, M. Rüsing, H. Fritze, L. M. Eng, and S. Sanna, “Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls,” <i>Physical Review Research</i>, vol. 6, no. 4, Art. no. L042015, 2024, doi: <a href=\"https://doi.org/10.1103/physrevresearch.6.l042015\">10.1103/physrevresearch.6.l042015</a>.","chicago":"Verhoff, Leonard M., Mike N. Pionteck, Michael Rüsing, Holger Fritze, Lukas M. Eng, and Simone Sanna. “Two-Dimensional Electronic Conductivity in Insulating Ferroelectrics: Peculiar Properties of Domain Walls.” <i>Physical Review Research</i> 6, no. 4 (2024). <a href=\"https://doi.org/10.1103/physrevresearch.6.l042015\">https://doi.org/10.1103/physrevresearch.6.l042015</a>.","ama":"Verhoff LM, Pionteck MN, Rüsing M, Fritze H, Eng LM, Sanna S. Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls. <i>Physical Review Research</i>. 2024;6(4). doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.l042015\">10.1103/physrevresearch.6.l042015</a>"},"intvolume":"         6"},{"type":"journal_article","status":"public","_id":"59273","user_id":"22501","department":[{"_id":"288"},{"_id":"15"},{"_id":"623"}],"article_type":"original","publication_status":"published","publication_identifier":{"issn":["0021-8979","1089-7550"]},"citation":{"short":"J. Ratzenberger, I. Kiseleva, B. Koppitz, E. Beyreuther, M. Zahn, J. Gössel, P.A. Hegarty, Z.H. Amber, M. Rüsing, L.M. Eng, Journal of Applied Physics 136 (2024) 104302.","mla":"Ratzenberger, Julius, et al. “Toward the Reproducible Fabrication of Conductive Ferroelectric Domain Walls into Lithium Niobate Bulk Single Crystals.” <i>Journal of Applied Physics</i>, vol. 136, no. 10, AIP Publishing, 2024, p. 104302, doi:<a href=\"https://doi.org/10.1063/5.0219300\">10.1063/5.0219300</a>.","bibtex":"@article{Ratzenberger_Kiseleva_Koppitz_Beyreuther_Zahn_Gössel_Hegarty_Amber_Rüsing_Eng_2024, title={Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals}, volume={136}, DOI={<a href=\"https://doi.org/10.1063/5.0219300\">10.1063/5.0219300</a>}, number={10}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Ratzenberger, Julius and Kiseleva, Iuliia and Koppitz, Boris and Beyreuther, Elke and Zahn, Manuel and Gössel, Joshua and Hegarty, Peter A. and Amber, Zeeshan H. and Rüsing, Michael and Eng, Lukas M.}, year={2024}, pages={104302} }","apa":"Ratzenberger, J., Kiseleva, I., Koppitz, B., Beyreuther, E., Zahn, M., Gössel, J., Hegarty, P. A., Amber, Z. H., Rüsing, M., &#38; Eng, L. M. (2024). Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals. <i>Journal of Applied Physics</i>, <i>136</i>(10), 104302. <a href=\"https://doi.org/10.1063/5.0219300\">https://doi.org/10.1063/5.0219300</a>","ama":"Ratzenberger J, Kiseleva I, Koppitz B, et al. Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals. <i>Journal of Applied Physics</i>. 2024;136(10):104302. doi:<a href=\"https://doi.org/10.1063/5.0219300\">10.1063/5.0219300</a>","ieee":"J. Ratzenberger <i>et al.</i>, “Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals,” <i>Journal of Applied Physics</i>, vol. 136, no. 10, p. 104302, 2024, doi: <a href=\"https://doi.org/10.1063/5.0219300\">10.1063/5.0219300</a>.","chicago":"Ratzenberger, Julius, Iuliia Kiseleva, Boris Koppitz, Elke Beyreuther, Manuel Zahn, Joshua Gössel, Peter A. Hegarty, Zeeshan H. Amber, Michael Rüsing, and Lukas M. Eng. “Toward the Reproducible Fabrication of Conductive Ferroelectric Domain Walls into Lithium Niobate Bulk Single Crystals.” <i>Journal of Applied Physics</i> 136, no. 10 (2024): 104302. <a href=\"https://doi.org/10.1063/5.0219300\">https://doi.org/10.1063/5.0219300</a>."},"intvolume":"       136","page":"104302","date_updated":"2025-04-02T16:14:31Z","oa":"1","author":[{"last_name":"Ratzenberger","full_name":"Ratzenberger, Julius","first_name":"Julius"},{"first_name":"Iuliia","last_name":"Kiseleva","full_name":"Kiseleva, Iuliia"},{"first_name":"Boris","full_name":"Koppitz, Boris","last_name":"Koppitz"},{"first_name":"Elke","last_name":"Beyreuther","full_name":"Beyreuther, Elke"},{"first_name":"Manuel","last_name":"Zahn","full_name":"Zahn, Manuel"},{"last_name":"Gössel","full_name":"Gössel, Joshua","first_name":"Joshua"},{"first_name":"Peter A.","last_name":"Hegarty","full_name":"Hegarty, Peter A."},{"last_name":"Amber","full_name":"Amber, Zeeshan H.","first_name":"Zeeshan H."},{"id":"22501","full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","first_name":"Michael"},{"full_name":"Eng, Lukas M.","last_name":"Eng","first_name":"Lukas M."}],"volume":136,"main_file_link":[{"open_access":"1","url":" https://doi.org/10.1063/5.0219300"}],"doi":"10.1063/5.0219300","publication":"Journal of Applied Physics","abstract":[{"text":"Ferroelectric domain walls (DWs) are promising structures for assembling future nano-electronic circuit elements on a larger scale since reporting domain wall currents of up to 1 mA per single DW. One key requirement hereto is their reproducible manufacturing by gaining preparative control over domain size and domain wall conductivity (DWC). To date, most works on DWC have focused on exploring the fundamental electrical properties of individual DWs within single-shot experiments, with an emphasis on quantifying the origins of DWC. Very few reports exist when it comes to comparing the DWC properties between two separate DWs, and literally nothing exists where issues of reproducibility in DWC devices have been addressed. To fill this gap while facing the challenge of finding guidelines for achieving predictable DWC performance, we report on a procedure that allows us to reproducibly prepare single hexagonal domains of a predefined diameter into uniaxial ferroelectric lithium niobate single crystals of 200 and 300 μm thickness, respectively. We show that the domain diameter can be controlled with an uncertainty of a few percent. As-grown DWs are then subjected to a standard procedure of current-limited high-voltage DWC enhancement, and they repetitively reach a DWC increase of six orders of magnitude. While all resulting DWs show significantly enhanced DWC values, their individual current–voltage (I–V) characteristics exhibit different shapes, which can be explained by variations in their 3D real structure reflecting local heterogeneities by defects, DW pinning, and surface-near DW inclination.","lang":"eng"}],"language":[{"iso":"eng"}],"quality_controlled":"1","issue":"10","year":"2024","publisher":"AIP Publishing","date_created":"2025-04-02T16:12:29Z","title":"Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals"},{"abstract":[{"lang":"eng","text":"Recently, ion exchange (IE) has been used to periodically modify the coercive field (Ec) of the crystal prior to periodic poling, to fabricate fine-pitch domain structures in Rb-doped KTiOPO4 (RKTP). Here, we use micro-Raman spectroscopy to understand the impact of IE on the vibrational modes related to the Rb/K lattice sites, TiO octahedra, and PO4 tetrahedra, which all form the basis of the RKTP crystal structure. We analyze the Raman spectra of three different RKTP samples: (1) a RKTP sample that shows a poled domain grating only, (2) a RKTP sample that has an Ec grating only, and (3) a RKTP sample that has both an Ec and a domain grating of the nominally same spacing. This allows us to determine the impact of IE on the vibrational modes of RKTP. We characterize the changes in the lower Raman peaks related to the alkali-metal ions, as well as observe lattice modifications induced by the incorporation of Rb+ that extend further into the crystal bulk than the expected IE depth. Moreover, the influence of IE on the domain walls is also manifested in their Raman peak shift. We discuss our results in terms of the deformation of the PO4and TiO groups. Our results highlight the intricate impact of IE on the crystal structure and how it facilitates periodic poling, paving the way for further development of the Ec-engineering technique."}],"publication":"Physical Review B","language":[{"iso":"eng"}],"year":"2024","issue":"21","title":"Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching","date_created":"2025-04-02T16:14:44Z","publisher":"American Physical Society (APS)","status":"public","type":"journal_article","article_number":"214115","article_type":"original","user_id":"22501","department":[{"_id":"288"},{"_id":"15"},{"_id":"623"}],"_id":"59274","citation":{"apa":"Lee, C. S. J., Canalias, C., Buschbeck, R., Koppitz, B., Hempel, F., Amber, Z., Eng, L. M., &#38; Rüsing, M. (2024). Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching. <i>Physical Review B</i>, <i>110</i>(21), Article 214115. <a href=\"https://doi.org/10.1103/physrevb.110.214115\">https://doi.org/10.1103/physrevb.110.214115</a>","short":"C.S.J. Lee, C. Canalias, R. Buschbeck, B. Koppitz, F. Hempel, Z. Amber, L.M. Eng, M. Rüsing, Physical Review B 110 (2024).","bibtex":"@article{Lee_Canalias_Buschbeck_Koppitz_Hempel_Amber_Eng_Rüsing_2024, title={Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching}, volume={110}, DOI={<a href=\"https://doi.org/10.1103/physrevb.110.214115\">10.1103/physrevb.110.214115</a>}, number={21214115}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Lee, Cherrie S. J. and Canalias, Carlota and Buschbeck, Robin and Koppitz, Boris and Hempel, Franz and Amber, Zeeshan and Eng, Lukas M. and Rüsing, Michael}, year={2024} }","mla":"Lee, Cherrie S. J., et al. “Impact of Ion Exchange on Vibrational Modes in Rb-Doped KTiOPO4: A Raman Spectroscopy Study on the Interplay between Ion Exchange and Polarization Switching.” <i>Physical Review B</i>, vol. 110, no. 21, 214115, American Physical Society (APS), 2024, doi:<a href=\"https://doi.org/10.1103/physrevb.110.214115\">10.1103/physrevb.110.214115</a>.","ama":"Lee CSJ, Canalias C, Buschbeck R, et al. Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching. <i>Physical Review B</i>. 2024;110(21). doi:<a href=\"https://doi.org/10.1103/physrevb.110.214115\">10.1103/physrevb.110.214115</a>","chicago":"Lee, Cherrie S. J., Carlota Canalias, Robin Buschbeck, Boris Koppitz, Franz Hempel, Zeeshan Amber, Lukas M. Eng, and Michael Rüsing. “Impact of Ion Exchange on Vibrational Modes in Rb-Doped KTiOPO4: A Raman Spectroscopy Study on the Interplay between Ion Exchange and Polarization Switching.” <i>Physical Review B</i> 110, no. 21 (2024). <a href=\"https://doi.org/10.1103/physrevb.110.214115\">https://doi.org/10.1103/physrevb.110.214115</a>.","ieee":"C. S. J. Lee <i>et al.</i>, “Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching,” <i>Physical Review B</i>, vol. 110, no. 21, Art. no. 214115, 2024, doi: <a href=\"https://doi.org/10.1103/physrevb.110.214115\">10.1103/physrevb.110.214115</a>."},"intvolume":"       110","publication_status":"published","publication_identifier":{"issn":["2469-9950","2469-9969"]},"doi":"10.1103/physrevb.110.214115","author":[{"last_name":"Lee","full_name":"Lee, Cherrie S. J.","first_name":"Cherrie S. J."},{"last_name":"Canalias","full_name":"Canalias, Carlota","first_name":"Carlota"},{"first_name":"Robin","full_name":"Buschbeck, Robin","last_name":"Buschbeck"},{"full_name":"Koppitz, Boris","last_name":"Koppitz","first_name":"Boris"},{"first_name":"Franz","full_name":"Hempel, Franz","last_name":"Hempel"},{"first_name":"Zeeshan","last_name":"Amber","full_name":"Amber, Zeeshan"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."},{"full_name":"Rüsing, Michael","id":"22501","orcid":"0000-0003-4682-4577","last_name":"Rüsing","first_name":"Michael"}],"volume":110,"date_updated":"2025-04-02T16:18:34Z"},{"publisher":"Wiley","date_updated":"2025-04-02T16:20:41Z","author":[{"full_name":"Usachov, D. Yu.","last_name":"Usachov","first_name":"D. Yu."},{"full_name":"Ali, K.","last_name":"Ali","first_name":"K."},{"last_name":"Poelchen","full_name":"Poelchen, G.","first_name":"G."},{"first_name":"M.","full_name":"Mende, M.","last_name":"Mende"},{"full_name":"Schulz, S.","last_name":"Schulz","first_name":"S."},{"first_name":"M.","last_name":"Peters","full_name":"Peters, M."},{"first_name":"K.","full_name":"Bokai, K.","last_name":"Bokai"},{"last_name":"Sklyadneva","full_name":"Sklyadneva, I. Yu.","first_name":"I. Yu."},{"full_name":"Stolyarov, V.","last_name":"Stolyarov","first_name":"V."},{"last_name":"Chulkov","full_name":"Chulkov, E. V.","first_name":"E. V."},{"first_name":"K.","last_name":"Kliemt","full_name":"Kliemt, K."},{"last_name":"Paischer","full_name":"Paischer, S.","first_name":"S."},{"full_name":"Buczek, P. A.","last_name":"Buczek","first_name":"P. A."},{"full_name":"Heid, R.","last_name":"Heid","first_name":"R."},{"full_name":"Hempel, F.","last_name":"Hempel","first_name":"F."},{"first_name":"Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577","id":"22501","full_name":"Rüsing, Michael"},{"first_name":"A.","full_name":"Ernst, A.","last_name":"Ernst"},{"first_name":"C.","full_name":"Krellner, C.","last_name":"Krellner"},{"first_name":"S. V.","full_name":"Eremeev, S. V.","last_name":"Eremeev"},{"first_name":"D. V.","last_name":"Vyalikh","full_name":"Vyalikh, D. V."}],"date_created":"2025-04-02T16:18:56Z","title":"Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2","doi":"10.1002/apxr.202400137","publication_status":"published","publication_identifier":{"issn":["2751-1200","2751-1200"]},"quality_controlled":"1","year":"2024","citation":{"apa":"Usachov, D. Yu., Ali, K., Poelchen, G., Mende, M., Schulz, S., Peters, M., Bokai, K., Sklyadneva, I. Yu., Stolyarov, V., Chulkov, E. V., Kliemt, K., Paischer, S., Buczek, P. A., Heid, R., Hempel, F., Rüsing, M., Ernst, A., Krellner, C., Eremeev, S. V., &#38; Vyalikh, D. V. (2024). Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2. <i>Advanced Physics Research</i>. <a href=\"https://doi.org/10.1002/apxr.202400137\">https://doi.org/10.1002/apxr.202400137</a>","short":"D.Yu. Usachov, K. Ali, G. Poelchen, M. Mende, S. Schulz, M. Peters, K. Bokai, I.Yu. Sklyadneva, V. Stolyarov, E.V. Chulkov, K. Kliemt, S. Paischer, P.A. Buczek, R. Heid, F. Hempel, M. Rüsing, A. Ernst, C. Krellner, S.V. Eremeev, D.V. Vyalikh, Advanced Physics Research (2024).","mla":"Usachov, D. Yu., et al. “Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2.” <i>Advanced Physics Research</i>, Wiley, 2024, doi:<a href=\"https://doi.org/10.1002/apxr.202400137\">10.1002/apxr.202400137</a>.","bibtex":"@article{Usachov_Ali_Poelchen_Mende_Schulz_Peters_Bokai_Sklyadneva_Stolyarov_Chulkov_et al._2024, title={Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2}, DOI={<a href=\"https://doi.org/10.1002/apxr.202400137\">10.1002/apxr.202400137</a>}, journal={Advanced Physics Research}, publisher={Wiley}, author={Usachov, D. Yu. and Ali, K. and Poelchen, G. and Mende, M. and Schulz, S. and Peters, M. and Bokai, K. and Sklyadneva, I. Yu. and Stolyarov, V. and Chulkov, E. V. and et al.}, year={2024} }","ama":"Usachov DYu, Ali K, Poelchen G, et al. Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2. <i>Advanced Physics Research</i>. Published online 2024. doi:<a href=\"https://doi.org/10.1002/apxr.202400137\">10.1002/apxr.202400137</a>","chicago":"Usachov, D. Yu., K. Ali, G. Poelchen, M. Mende, S. Schulz, M. Peters, K. Bokai, et al. “Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2.” <i>Advanced Physics Research</i>, 2024. <a href=\"https://doi.org/10.1002/apxr.202400137\">https://doi.org/10.1002/apxr.202400137</a>.","ieee":"D. Yu. Usachov <i>et al.</i>, “Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2,” <i>Advanced Physics Research</i>, 2024, doi: <a href=\"https://doi.org/10.1002/apxr.202400137\">10.1002/apxr.202400137</a>."},"_id":"59275","user_id":"22501","department":[{"_id":"288"},{"_id":"623"},{"_id":"15"}],"language":[{"iso":"eng"}],"type":"journal_article","publication":"Advanced Physics Research","abstract":[{"lang":"eng","text":"Studying and understanding many‐body interactions, particularly electron‐boson interactions, is essential for a deeper elucidation of fundamental physical phenomena and the development of novel material functionalities. Here, this aspect is explored in the weak itinerant ferromagnet LaCo2P2 by means of momentum‐resolved photoelectron spectroscopy (ARPES) and first‐principles calculations. The detailed ARPES patterns enable to unveil bulk and surface bands, spin splittings due to Rashba and exchange interactions, as well as the evolution of bands with temperature, which altogether creates a solid foundation for theoretical studies. The latter has allowed to establish the impact of electron‐boson interactions on the electronic structure, that are reflected in its strong renormalization driven by electron‐magnon interaction and the emergence of distinctive kinks of surface and bulk electron bands due to significant electron‐phonon coupling. Our results highlight the distinct impact of electron‐boson interactions on the electronic structure, particularly on the itinerant d states. Similar electronic states are observed in the isostructural iron pnictides, where electron‐boson interactions play a crucial role in the emergence of superconductivity. It is believed that further studies of material systems involving both magnetically active d‐ and f‐sublattices will reveal more advanced phenomena in the bulk and at distinct surfaces, driven by a combination of factors including Rashba and Kondo effects, exchange magnetism, and electron‐boson interactions."}],"status":"public"},{"abstract":[{"lang":"eng","text":"<jats:p>Ferroelectric domain wall conductivity (DWC) is an intriguing and promising functional property that can be elegantly controlled and steered through a variety of external stimuli such as electric and mechanical fields. Optical-field control, as a noninvasive and flexible tool, has rarely been applied so far, but it significantly expands the possibility for both tuning and probing DWC. On the one hand, as known from second-harmonic or Raman micro-spectroscopy, the optical approach provides information on DW distribution and inclination, while simultaneously probing the DW vibrational modes; on the other hand, photons might be applied to directly generate charge carriers, thereby acting as a functional and spectrally tunable probe to deduce the local absorption properties and bandgaps of conductive DWs. Here, we report on investigating the photo-induced DWC (PI-DWC) of three lithium niobate crystals, containing a very different number of DWs, namely: (A) none, (B) one, and (C) many conductive DWs. All three samples are inspected for their current–voltage behavior in darkness and for different illumination wavelengths swept from 500 nm down to 310 nm. All samples show their maximum PI-DWC at 310 nm; moreover, sample (C) reaches PI-DWCs of several microampere. Interestingly, a noticeable PI-DWC is also observed for sub-bandgap illumination, hinting toward the existence and decisive role of electronic in-gap states that contribute to the electronic charge transport along DWs. Finally, complementary conductive atomic force microscopy investigations under illumination proved that the PI-DWC indeed is confined to the DW area and does not originate from photo-induced bulk conductivity.</jats:p>"}],"status":"public","publication":"Applied Physics Letters","type":"journal_article","article_type":"original","language":[{"iso":"eng"}],"_id":"54967","department":[{"_id":"15"},{"_id":"169"},{"_id":"623"}],"user_id":"22501","year":"2024","intvolume":"       124","citation":{"ieee":"L. L. Ding <i>et al.</i>, “Comparative study of photo-induced electronic transport along ferroelectric domain walls in lithium niobate single crystals,” <i>Applied Physics Letters</i>, vol. 124, no. 25, 2024, doi: <a href=\"https://doi.org/10.1063/5.0205877\">10.1063/5.0205877</a>.","chicago":"Ding, L. L., E. Beyreuther, B. Koppitz, K. Kempf, J. H. Ren, W. J. Chen, Michael Rüsing, Y. Zheng, and L. M. Eng. “Comparative Study of Photo-Induced Electronic Transport along Ferroelectric Domain Walls in Lithium Niobate Single Crystals.” <i>Applied Physics Letters</i> 124, no. 25 (2024). <a href=\"https://doi.org/10.1063/5.0205877\">https://doi.org/10.1063/5.0205877</a>.","ama":"Ding LL, Beyreuther E, Koppitz B, et al. Comparative study of photo-induced electronic transport along ferroelectric domain walls in lithium niobate single crystals. <i>Applied Physics Letters</i>. 2024;124(25). doi:<a href=\"https://doi.org/10.1063/5.0205877\">10.1063/5.0205877</a>","short":"L.L. Ding, E. Beyreuther, B. Koppitz, K. Kempf, J.H. Ren, W.J. Chen, M. Rüsing, Y. Zheng, L.M. Eng, Applied Physics Letters 124 (2024).","mla":"Ding, L. L., et al. “Comparative Study of Photo-Induced Electronic Transport along Ferroelectric Domain Walls in Lithium Niobate Single Crystals.” <i>Applied Physics Letters</i>, vol. 124, no. 25, AIP Publishing, 2024, doi:<a href=\"https://doi.org/10.1063/5.0205877\">10.1063/5.0205877</a>.","bibtex":"@article{Ding_Beyreuther_Koppitz_Kempf_Ren_Chen_Rüsing_Zheng_Eng_2024, title={Comparative study of photo-induced electronic transport along ferroelectric domain walls in lithium niobate single crystals}, volume={124}, DOI={<a href=\"https://doi.org/10.1063/5.0205877\">10.1063/5.0205877</a>}, number={25}, journal={Applied Physics Letters}, publisher={AIP Publishing}, author={Ding, L. L. and Beyreuther, E. and Koppitz, B. and Kempf, K. and Ren, J. H. and Chen, W. J. and Rüsing, Michael and Zheng, Y. and Eng, L. M.}, year={2024} }","apa":"Ding, L. L., Beyreuther, E., Koppitz, B., Kempf, K., Ren, J. H., Chen, W. J., Rüsing, M., Zheng, Y., &#38; Eng, L. M. (2024). Comparative study of photo-induced electronic transport along ferroelectric domain walls in lithium niobate single crystals. <i>Applied Physics Letters</i>, <i>124</i>(25). <a href=\"https://doi.org/10.1063/5.0205877\">https://doi.org/10.1063/5.0205877</a>"},"publication_identifier":{"issn":["0003-6951","1077-3118"]},"quality_controlled":"1","publication_status":"published","issue":"25","title":"Comparative study of photo-induced electronic transport along ferroelectric domain walls in lithium niobate single crystals","doi":"10.1063/5.0205877","main_file_link":[{"url":"https://doi.org/10.1063/5.0205877"}],"date_updated":"2025-04-03T12:35:17Z","publisher":"AIP Publishing","volume":124,"date_created":"2024-07-01T21:03:23Z","author":[{"first_name":"L. L.","last_name":"Ding","full_name":"Ding, L. L."},{"full_name":"Beyreuther, E.","last_name":"Beyreuther","first_name":"E."},{"first_name":"B.","full_name":"Koppitz, B.","last_name":"Koppitz"},{"first_name":"K.","last_name":"Kempf","full_name":"Kempf, K."},{"full_name":"Ren, J. H.","last_name":"Ren","first_name":"J. H."},{"first_name":"W. J.","last_name":"Chen","full_name":"Chen, W. J."},{"first_name":"Michael","id":"22501","full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing"},{"full_name":"Zheng, Y.","last_name":"Zheng","first_name":"Y."},{"full_name":"Eng, L. M.","last_name":"Eng","first_name":"L. M."}]},{"publication":"Journal of Applied Physics","abstract":[{"lang":"eng","text":"Piezoresponse force microscopy (PFM) is one of the most widespread methods for investigating and visualizing ferroelectric domain structures down to the nanometer length scale. PFM makes use of the direct coupling of the piezoelectric response to the crystal lattice, and hence, it is most often applied to spatially map the three-dimensional (3D) near-surface domain distribution of any polar or ferroic sample. Nonetheless, since most samples investigated by PFM are at least semiconducting or fully insulating, the electric ac field emerging from the conductive scanning force microscopy (SFM) tip penetrates the sample and, hence, may also couple to polar features that are deeply buried into the bulk of the sample under investigation. Thus, in the work presented here, we experimentally and theoretically explore the contrast and depth resolution capabilities of PFM, by analyzing the dependence of several key parameters. These key parameters include the depth of the buried feature, i.e., here a domain wall (DW), as well as PFM-relevant technical parameters such as the tip radius, the PFM drive voltage and frequency, and the signal-to-noise ratio. The theoretical predictions are experimentally verified using x-cut periodically poled lithium niobate single crystals that are specially prepared into wedge-shaped samples, in order to allow the buried feature, here the DW, to be “positioned” at any depth into the bulk. This inspection essentially contributes to the fundamental understanding in PFM contrast analysis and to the reconstruction of 3D domain structures down to a 1 μm-penetration depth into the sample."}],"language":[{"iso":"eng"}],"keyword":["Ferroelectrics","lithium niobate","piezoresponse force microscopy"],"issue":"22","quality_controlled":"1","year":"2024","date_created":"2024-07-01T21:00:43Z","publisher":"AIP Publishing","title":"Depth resolution in piezoresponse force microscopy","type":"journal_article","status":"public","department":[{"_id":"15"},{"_id":"169"},{"_id":"288"},{"_id":"623"}],"user_id":"22501","_id":"54966","article_type":"original","publication_identifier":{"issn":["0021-8979","1089-7550"]},"publication_status":"published","intvolume":"       135","citation":{"short":"M. Roeper, S.D. Seddon, Z.H. Amber, M. Rüsing, L.M. Eng, Journal of Applied Physics 135 (2024).","mla":"Roeper, Matthias, et al. “Depth Resolution in Piezoresponse Force Microscopy.” <i>Journal of Applied Physics</i>, vol. 135, no. 22, AIP Publishing, 2024, doi:<a href=\"https://doi.org/10.1063/5.0206784\">10.1063/5.0206784</a>.","bibtex":"@article{Roeper_Seddon_Amber_Rüsing_Eng_2024, title={Depth resolution in piezoresponse force microscopy}, volume={135}, DOI={<a href=\"https://doi.org/10.1063/5.0206784\">10.1063/5.0206784</a>}, number={22}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Roeper, Matthias and Seddon, Samuel D. and Amber, Zeeshan H. and Rüsing, Michael and Eng, Lukas M.}, year={2024} }","apa":"Roeper, M., Seddon, S. D., Amber, Z. H., Rüsing, M., &#38; Eng, L. M. (2024). Depth resolution in piezoresponse force microscopy. <i>Journal of Applied Physics</i>, <i>135</i>(22). <a href=\"https://doi.org/10.1063/5.0206784\">https://doi.org/10.1063/5.0206784</a>","ieee":"M. Roeper, S. D. Seddon, Z. H. Amber, M. Rüsing, and L. M. Eng, “Depth resolution in piezoresponse force microscopy,” <i>Journal of Applied Physics</i>, vol. 135, no. 22, 2024, doi: <a href=\"https://doi.org/10.1063/5.0206784\">10.1063/5.0206784</a>.","chicago":"Roeper, Matthias, Samuel D. Seddon, Zeeshan H. Amber, Michael Rüsing, and Lukas M. Eng. “Depth Resolution in Piezoresponse Force Microscopy.” <i>Journal of Applied Physics</i> 135, no. 22 (2024). <a href=\"https://doi.org/10.1063/5.0206784\">https://doi.org/10.1063/5.0206784</a>.","ama":"Roeper M, Seddon SD, Amber ZH, Rüsing M, Eng LM. Depth resolution in piezoresponse force microscopy. <i>Journal of Applied Physics</i>. 2024;135(22). doi:<a href=\"https://doi.org/10.1063/5.0206784\">10.1063/5.0206784</a>"},"volume":135,"author":[{"first_name":"Matthias","last_name":"Roeper","full_name":"Roeper, Matthias"},{"first_name":"Samuel D.","last_name":"Seddon","full_name":"Seddon, Samuel D."},{"first_name":"Zeeshan H.","full_name":"Amber, Zeeshan H.","last_name":"Amber"},{"first_name":"Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577","full_name":"Rüsing, Michael","id":"22501"},{"full_name":"Eng, Lukas M.","last_name":"Eng","first_name":"Lukas M."}],"date_updated":"2025-04-03T12:35:34Z","oa":"1","doi":"10.1063/5.0206784","main_file_link":[{"url":"https://doi.org/10.1063/5.0206784","open_access":"1"}]},{"author":[{"full_name":"Schwabe, Tobias","id":"39217","last_name":"Schwabe","first_name":"Tobias"},{"first_name":"Michael","id":"22501","full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing"},{"full_name":"Staal, Niels","last_name":"Staal","first_name":"Niels"},{"first_name":"Max","last_name":"Schwengelbeck","full_name":"Schwengelbeck, Max"},{"first_name":"Laura","full_name":"Bollmers, Laura","id":"61375","last_name":"Bollmers"},{"first_name":"Laura","last_name":"Padberg","full_name":"Padberg, Laura","id":"40300"},{"first_name":"Christof","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","full_name":"Eigner, Christof","id":"13244"},{"last_name":"Silberhorn","id":"26263","full_name":"Silberhorn, Christine","first_name":"Christine"},{"first_name":"J. Christoph","id":"37144","full_name":"Scheytt, J. Christoph","last_name":"Scheytt","orcid":"0000-0002-5950-6618 "}],"date_created":"2025-04-02T11:24:23Z","publisher":"Zenodo","date_updated":"2025-04-03T12:34:56Z","doi":"10.5281/zenodo.15124929","title":"Quantum photonic systems in CMOS compatible silicon nitride technology ","citation":{"ieee":"T. Schwabe <i>et al.</i>, <i>Quantum photonic systems in CMOS compatible silicon nitride technology </i>. Zenodo, 2024.","chicago":"Schwabe, Tobias, Michael Rüsing, Niels Staal, Max Schwengelbeck, Laura Bollmers, Laura Padberg, Christof Eigner, Christine Silberhorn, and J. Christoph Scheytt. <i>Quantum Photonic Systems in CMOS Compatible Silicon Nitride Technology </i>. Zenodo, 2024. <a href=\"https://doi.org/10.5281/zenodo.15124929\">https://doi.org/10.5281/zenodo.15124929</a>.","ama":"Schwabe T, Rüsing M, Staal N, et al. <i>Quantum Photonic Systems in CMOS Compatible Silicon Nitride Technology </i>. Zenodo; 2024. doi:<a href=\"https://doi.org/10.5281/zenodo.15124929\">10.5281/zenodo.15124929</a>","apa":"Schwabe, T., Rüsing, M., Staal, N., Schwengelbeck, M., Bollmers, L., Padberg, L., Eigner, C., Silberhorn, C., &#38; Scheytt, J. C. (2024). <i>Quantum photonic systems in CMOS compatible silicon nitride technology </i>. Zenodo. <a href=\"https://doi.org/10.5281/zenodo.15124929\">https://doi.org/10.5281/zenodo.15124929</a>","mla":"Schwabe, Tobias, et al. <i>Quantum Photonic Systems in CMOS Compatible Silicon Nitride Technology </i>. Zenodo, 2024, doi:<a href=\"https://doi.org/10.5281/zenodo.15124929\">10.5281/zenodo.15124929</a>.","short":"T. Schwabe, M. Rüsing, N. Staal, M. Schwengelbeck, L. Bollmers, L. Padberg, C. Eigner, C. Silberhorn, J.C. Scheytt, Quantum Photonic Systems in CMOS Compatible Silicon Nitride Technology , Zenodo, 2024.","bibtex":"@book{Schwabe_Rüsing_Staal_Schwengelbeck_Bollmers_Padberg_Eigner_Silberhorn_Scheytt_2024, title={Quantum photonic systems in CMOS compatible silicon nitride technology }, DOI={<a href=\"https://doi.org/10.5281/zenodo.15124929\">10.5281/zenodo.15124929</a>}, publisher={Zenodo}, author={Schwabe, Tobias and Rüsing, Michael and Staal, Niels and Schwengelbeck, Max and Bollmers, Laura and Padberg, Laura and Eigner, Christof and Silberhorn, Christine and Scheytt, J. Christoph}, year={2024} }"},"year":"2024","department":[{"_id":"288"},{"_id":"15"},{"_id":"623"}],"user_id":"22501","_id":"59259","language":[{"iso":"eng"}],"type":"misc","status":"public"},{"language":[{"iso":"eng"}],"publication":"APL Quantum","abstract":[{"lang":"eng","text":"<jats:p>We theoretically investigate strategies for the deterministic creation of trains of time-bin entangled photons using an individual quantum emitter described by a Λ-type electronic system. We explicitly demonstrate the theoretical generation of linear cluster states with substantial numbers of entangled photonic qubits in full microscopic numerical simulations. The underlying scheme is based on the manipulation of ground state coherences through precise optical driving. One important finding is that the most easily accessible quality metrics, the achievable rotation fidelities, fall short in assessing the actual quantum correlations of the emitted photons in the face of losses. To address this, we explicitly calculate stabilizer generator expectation values as a superior gauge for the quantum properties of the generated many-photon state. With widespread applicability in other emitter and excitation–emission schemes also, our work lays the conceptual foundations for an in-depth practical analysis of time-bin entanglement based on full numerical simulations with predictive capabilities for realistic systems and setups, including losses and imperfections. The specific results shown in the present work illustrate that with controlled minimization of losses and realistic system parameters for quantum-dot type systems, useful linear cluster states of significant lengths can be generated in the calculations, discussing the possibility of scalability for quantum information processing endeavors.</jats:p>"}],"publisher":"AIP Publishing","date_created":"2025-09-12T11:08:59Z","title":"Time-bin entanglement in the deterministic generation of linear photonic cluster states","issue":"3","year":"2024","_id":"61251","project":[{"name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"_id":"56","name":"TRR 142 - Project Area C"},{"name":"TRR 142; TP C09: Ideale Erzeugung von Photonenpaaren für Verschränkungsaustausch bei Telekom Wellenlängen","_id":"173"},{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"name":"PhoQC: Photonisches Quantencomputing","_id":"266"}],"department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"35"},{"_id":"230"},{"_id":"27"},{"_id":"429"},{"_id":"623"}],"user_id":"16199","article_number":"036110","type":"journal_article","status":"public","date_updated":"2025-09-12T11:11:32Z","volume":1,"author":[{"first_name":"David","last_name":"Bauch","full_name":"Bauch, David"},{"full_name":"Köcher, Nikolas","id":"79191","last_name":"Köcher","first_name":"Nikolas"},{"first_name":"Nils","last_name":"Heinisch","orcid":"0009-0006-0984-2097","id":"90283","full_name":"Heinisch, Nils"},{"full_name":"Schumacher, Stefan","id":"27271","last_name":"Schumacher","orcid":"0000-0003-4042-4951","first_name":"Stefan"}],"doi":"10.1063/5.0214197","publication_identifier":{"issn":["2835-0103"]},"publication_status":"published","intvolume":"         1","citation":{"apa":"Bauch, D., Köcher, N., Heinisch, N., &#38; Schumacher, S. (2024). Time-bin entanglement in the deterministic generation of linear photonic cluster states. <i>APL Quantum</i>, <i>1</i>(3), Article 036110. <a href=\"https://doi.org/10.1063/5.0214197\">https://doi.org/10.1063/5.0214197</a>","mla":"Bauch, David, et al. “Time-Bin Entanglement in the Deterministic Generation of Linear Photonic Cluster States.” <i>APL Quantum</i>, vol. 1, no. 3, 036110, AIP Publishing, 2024, doi:<a href=\"https://doi.org/10.1063/5.0214197\">10.1063/5.0214197</a>.","bibtex":"@article{Bauch_Köcher_Heinisch_Schumacher_2024, title={Time-bin entanglement in the deterministic generation of linear photonic cluster states}, volume={1}, DOI={<a href=\"https://doi.org/10.1063/5.0214197\">10.1063/5.0214197</a>}, number={3036110}, journal={APL Quantum}, publisher={AIP Publishing}, author={Bauch, David and Köcher, Nikolas and Heinisch, Nils and Schumacher, Stefan}, year={2024} }","short":"D. Bauch, N. Köcher, N. Heinisch, S. Schumacher, APL Quantum 1 (2024).","ama":"Bauch D, Köcher N, Heinisch N, Schumacher S. Time-bin entanglement in the deterministic generation of linear photonic cluster states. <i>APL Quantum</i>. 2024;1(3). doi:<a href=\"https://doi.org/10.1063/5.0214197\">10.1063/5.0214197</a>","ieee":"D. Bauch, N. Köcher, N. Heinisch, and S. Schumacher, “Time-bin entanglement in the deterministic generation of linear photonic cluster states,” <i>APL Quantum</i>, vol. 1, no. 3, Art. no. 036110, 2024, doi: <a href=\"https://doi.org/10.1063/5.0214197\">10.1063/5.0214197</a>.","chicago":"Bauch, David, Nikolas Köcher, Nils Heinisch, and Stefan Schumacher. “Time-Bin Entanglement in the Deterministic Generation of Linear Photonic Cluster States.” <i>APL Quantum</i> 1, no. 3 (2024). <a href=\"https://doi.org/10.1063/5.0214197\">https://doi.org/10.1063/5.0214197</a>."}},{"year":"2024","citation":{"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>.","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>.","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>","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} }","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>.","short":"L. Serino, W. Ridder, A. Bhattacharjee, J. Gil López, B. Brecht, C. Silberhorn, Optica Quantum (2024).","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>"},"publication_status":"published","publication_identifier":{"issn":["2837-6714"]},"title":"Orchestrating time and color: a programmable source of high-dimensional entanglement","doi":"10.1364/opticaq.532334","publisher":"Optica Publishing Group","date_updated":"2025-12-01T08:49:46Z","author":[{"last_name":"Serino","id":"88242","full_name":"Serino, Laura","first_name":"Laura"},{"id":"63574","full_name":"Ridder, Werner","last_name":"Ridder","first_name":"Werner"},{"last_name":"Bhattacharjee","full_name":"Bhattacharjee, Abhinandan","id":"95902","first_name":"Abhinandan"},{"first_name":"Jano","full_name":"Gil López, Jano","id":"51223","last_name":"Gil López"},{"id":"27150","full_name":"Brecht, Benjamin","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","first_name":"Benjamin"},{"id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine"}],"date_created":"2024-09-27T11:46:59Z","status":"public","type":"journal_article","publication":"Optica Quantum","language":[{"iso":"eng"}],"project":[{"_id":"211","name":"QuICHE: Quanteninformation und Quantenkommunikation mit hochdimensionaler Informationskodierung (QuICHE)"}],"_id":"56267","user_id":"63574","department":[{"_id":"288"},{"_id":"623"},{"_id":"288"}]},{"publication":"Communications Physics","type":"journal_article","abstract":[{"text":"<jats:title>Abstract</jats:title><jats:p>An on-demand source of bright entangled photon pairs is desirable for quantum key distribution (QKD) and quantum repeaters. The leading candidate to generate such pairs is based on spontaneous parametric down-conversion (SPDC) in non-linear crystals. However, its pair extraction efficiency is limited to 0.1% when operating at near-unity fidelity due to multiphoton emission at high brightness. Quantum dots in photonic nanostructures can in principle overcome this limit, but the devices with high entanglement fidelity (99%) have low pair extraction efficiency (0.01%). Here, we show a measured peak entanglement fidelity of 97.5% ± 0.8% and pair extraction efficiency of 0.65% from an InAsP quantum dot in an InP photonic nanowire waveguide. We show that the generated oscillating two-photon Bell state can establish a secure key for peer-to-peer QKD. Using our time-resolved QKD scheme alleviates the need to remove the quantum dot energy splitting of the intermediate exciton states in the biexciton-exciton cascade.</jats:p>","lang":"eng"}],"status":"public","_id":"62849","department":[{"_id":"623"}],"user_id":"48188","article_number":"62","language":[{"iso":"eng"}],"publication_identifier":{"issn":["2399-3650"]},"publication_status":"published","issue":"1","year":"2024","intvolume":"         7","citation":{"apa":"Pennacchietti, M., Cunard, B., Nahar, S., Zeeshan, M., Gangopadhyay, S., Poole, P. J., Dalacu, D., Fognini, A., Jöns, K., Zwiller, V., Jennewein, T., Lütkenhaus, N., &#38; Reimer, M. E. (2024). Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution. <i>Communications Physics</i>, <i>7</i>(1), Article 62. <a href=\"https://doi.org/10.1038/s42005-024-01547-3\">https://doi.org/10.1038/s42005-024-01547-3</a>","mla":"Pennacchietti, Matteo, et al. “Oscillating Photonic Bell State from a Semiconductor Quantum Dot for Quantum Key Distribution.” <i>Communications Physics</i>, vol. 7, no. 1, 62, Springer Science and Business Media LLC, 2024, doi:<a href=\"https://doi.org/10.1038/s42005-024-01547-3\">10.1038/s42005-024-01547-3</a>.","short":"M. Pennacchietti, B. Cunard, S. Nahar, M. Zeeshan, S. Gangopadhyay, P.J. Poole, D. Dalacu, A. Fognini, K. Jöns, V. Zwiller, T. Jennewein, N. Lütkenhaus, M.E. Reimer, Communications Physics 7 (2024).","bibtex":"@article{Pennacchietti_Cunard_Nahar_Zeeshan_Gangopadhyay_Poole_Dalacu_Fognini_Jöns_Zwiller_et al._2024, title={Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution}, volume={7}, DOI={<a href=\"https://doi.org/10.1038/s42005-024-01547-3\">10.1038/s42005-024-01547-3</a>}, number={162}, journal={Communications Physics}, publisher={Springer Science and Business Media LLC}, author={Pennacchietti, Matteo and Cunard, Brady and Nahar, Shlok and Zeeshan, Mohd and Gangopadhyay, Sayan and Poole, Philip J. and Dalacu, Dan and Fognini, Andreas and Jöns, Klaus and Zwiller, Val and et al.}, year={2024} }","ama":"Pennacchietti M, Cunard B, Nahar S, et al. Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution. <i>Communications Physics</i>. 2024;7(1). doi:<a href=\"https://doi.org/10.1038/s42005-024-01547-3\">10.1038/s42005-024-01547-3</a>","chicago":"Pennacchietti, Matteo, Brady Cunard, Shlok Nahar, Mohd Zeeshan, Sayan Gangopadhyay, Philip J. Poole, Dan Dalacu, et al. “Oscillating Photonic Bell State from a Semiconductor Quantum Dot for Quantum Key Distribution.” <i>Communications Physics</i> 7, no. 1 (2024). <a href=\"https://doi.org/10.1038/s42005-024-01547-3\">https://doi.org/10.1038/s42005-024-01547-3</a>.","ieee":"M. Pennacchietti <i>et al.</i>, “Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution,” <i>Communications Physics</i>, vol. 7, no. 1, Art. no. 62, 2024, doi: <a href=\"https://doi.org/10.1038/s42005-024-01547-3\">10.1038/s42005-024-01547-3</a>."},"date_updated":"2025-12-04T12:23:54Z","publisher":"Springer Science and Business Media LLC","volume":7,"author":[{"first_name":"Matteo","last_name":"Pennacchietti","full_name":"Pennacchietti, Matteo"},{"last_name":"Cunard","full_name":"Cunard, Brady","first_name":"Brady"},{"first_name":"Shlok","full_name":"Nahar, Shlok","last_name":"Nahar"},{"full_name":"Zeeshan, Mohd","last_name":"Zeeshan","first_name":"Mohd"},{"full_name":"Gangopadhyay, Sayan","last_name":"Gangopadhyay","first_name":"Sayan"},{"full_name":"Poole, Philip J.","last_name":"Poole","first_name":"Philip J."},{"first_name":"Dan","last_name":"Dalacu","full_name":"Dalacu, Dan"},{"last_name":"Fognini","full_name":"Fognini, Andreas","first_name":"Andreas"},{"first_name":"Klaus","id":"85353","full_name":"Jöns, Klaus","last_name":"Jöns"},{"last_name":"Zwiller","full_name":"Zwiller, Val","first_name":"Val"},{"first_name":"Thomas","full_name":"Jennewein, Thomas","last_name":"Jennewein"},{"first_name":"Norbert","last_name":"Lütkenhaus","full_name":"Lütkenhaus, Norbert"},{"full_name":"Reimer, Michael E.","last_name":"Reimer","first_name":"Michael E."}],"date_created":"2025-12-04T12:03:50Z","title":"Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution","doi":"10.1038/s42005-024-01547-3"}]