[{"language":[{"iso":"eng"}],"keyword":["Mechanical Engineering","Condensed Matter Physics","General Materials Science","General Chemistry","Bioengineering"],"department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"230"},{"_id":"429"},{"_id":"35"},{"_id":"790"}],"user_id":"16199","_id":"37713","project":[{"name":"TRR 142: TRR 142","_id":"53"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"name":"TRR 142 - A11: TRR 142 - Subproject A11","_id":"166"},{"_id":"168","name":"TRR 142 - B07: TRR 142 - Subproject B07"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"},{"name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"}],"status":"public","publication":"Nano Letters","type":"journal_article","doi":"10.1021/acs.nanolett.1c04610","title":"Electron–Nuclear Coherent Coupling and Nuclear Spin Readout through Optically Polarized V<sub>B</sub><sup>–</sup> Spin States in hBN","volume":22,"author":[{"first_name":"Fadis F.","full_name":"Murzakhanov, Fadis F.","last_name":"Murzakhanov"},{"first_name":"Georgy Vladimirovich","full_name":"Mamin, Georgy Vladimirovich","last_name":"Mamin"},{"last_name":"Orlinskii","full_name":"Orlinskii, Sergei Borisovich","first_name":"Sergei Borisovich"},{"first_name":"Uwe","id":"171","full_name":"Gerstmann, Uwe","last_name":"Gerstmann","orcid":"0000-0002-4476-223X"},{"orcid":"0000-0002-2717-5076","last_name":"Schmidt","full_name":"Schmidt, Wolf Gero","id":"468","first_name":"Wolf Gero"},{"first_name":"Timur","last_name":"Biktagirov","full_name":"Biktagirov, Timur","id":"65612"},{"full_name":"Aharonovich, Igor","last_name":"Aharonovich","first_name":"Igor"},{"full_name":"Gottscholl, Andreas","last_name":"Gottscholl","first_name":"Andreas"},{"full_name":"Sperlich, Andreas","last_name":"Sperlich","first_name":"Andreas"},{"first_name":"Vladimir","full_name":"Dyakonov, Vladimir","last_name":"Dyakonov"},{"first_name":"Victor A.","last_name":"Soltamov","full_name":"Soltamov, Victor A."}],"date_created":"2023-01-20T11:21:22Z","date_updated":"2025-12-05T13:57:24Z","publisher":"American Chemical Society (ACS)","intvolume":"        22","page":"2718-2724","citation":{"mla":"Murzakhanov, Fadis F., et al. “Electron–Nuclear Coherent Coupling and Nuclear Spin Readout through Optically Polarized V<sub>B</sub><sup>–</sup> Spin States in HBN.” <i>Nano Letters</i>, vol. 22, no. 7, American Chemical Society (ACS), 2022, pp. 2718–24, doi:<a href=\"https://doi.org/10.1021/acs.nanolett.1c04610\">10.1021/acs.nanolett.1c04610</a>.","short":"F.F. Murzakhanov, G.V. Mamin, S.B. Orlinskii, U. Gerstmann, W.G. Schmidt, T. Biktagirov, I. Aharonovich, A. Gottscholl, A. Sperlich, V. Dyakonov, V.A. Soltamov, Nano Letters 22 (2022) 2718–2724.","bibtex":"@article{Murzakhanov_Mamin_Orlinskii_Gerstmann_Schmidt_Biktagirov_Aharonovich_Gottscholl_Sperlich_Dyakonov_et al._2022, title={Electron–Nuclear Coherent Coupling and Nuclear Spin Readout through Optically Polarized V<sub>B</sub><sup>–</sup> Spin States in hBN}, volume={22}, DOI={<a href=\"https://doi.org/10.1021/acs.nanolett.1c04610\">10.1021/acs.nanolett.1c04610</a>}, number={7}, journal={Nano Letters}, publisher={American Chemical Society (ACS)}, author={Murzakhanov, Fadis F. and Mamin, Georgy Vladimirovich and Orlinskii, Sergei Borisovich and Gerstmann, Uwe and Schmidt, Wolf Gero and Biktagirov, Timur and Aharonovich, Igor and Gottscholl, Andreas and Sperlich, Andreas and Dyakonov, Vladimir and et al.}, year={2022}, pages={2718–2724} }","apa":"Murzakhanov, F. F., Mamin, G. V., Orlinskii, S. B., Gerstmann, U., Schmidt, W. G., Biktagirov, T., Aharonovich, I., Gottscholl, A., Sperlich, A., Dyakonov, V., &#38; Soltamov, V. A. (2022). Electron–Nuclear Coherent Coupling and Nuclear Spin Readout through Optically Polarized V<sub>B</sub><sup>–</sup> Spin States in hBN. <i>Nano Letters</i>, <i>22</i>(7), 2718–2724. <a href=\"https://doi.org/10.1021/acs.nanolett.1c04610\">https://doi.org/10.1021/acs.nanolett.1c04610</a>","ama":"Murzakhanov FF, Mamin GV, Orlinskii SB, et al. Electron–Nuclear Coherent Coupling and Nuclear Spin Readout through Optically Polarized V<sub>B</sub><sup>–</sup> Spin States in hBN. <i>Nano Letters</i>. 2022;22(7):2718-2724. doi:<a href=\"https://doi.org/10.1021/acs.nanolett.1c04610\">10.1021/acs.nanolett.1c04610</a>","chicago":"Murzakhanov, Fadis F., Georgy Vladimirovich Mamin, Sergei Borisovich Orlinskii, Uwe Gerstmann, Wolf Gero Schmidt, Timur Biktagirov, Igor Aharonovich, et al. “Electron–Nuclear Coherent Coupling and Nuclear Spin Readout through Optically Polarized V<sub>B</sub><sup>–</sup> Spin States in HBN.” <i>Nano Letters</i> 22, no. 7 (2022): 2718–24. <a href=\"https://doi.org/10.1021/acs.nanolett.1c04610\">https://doi.org/10.1021/acs.nanolett.1c04610</a>.","ieee":"F. F. Murzakhanov <i>et al.</i>, “Electron–Nuclear Coherent Coupling and Nuclear Spin Readout through Optically Polarized V<sub>B</sub><sup>–</sup> Spin States in hBN,” <i>Nano Letters</i>, vol. 22, no. 7, pp. 2718–2724, 2022, doi: <a href=\"https://doi.org/10.1021/acs.nanolett.1c04610\">10.1021/acs.nanolett.1c04610</a>."},"year":"2022","issue":"7","publication_identifier":{"issn":["1530-6984","1530-6992"]},"publication_status":"published"},{"publication":"Advanced Science","type":"journal_article","status":"public","department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"705"},{"_id":"230"},{"_id":"429"},{"_id":"35"}],"user_id":"16199","_id":"33080","project":[{"_id":"53","name":"TRR 142: TRR 142"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"_id":"61","name":"TRR 142 - A4: TRR 142 - Subproject A4"},{"name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"}],"language":[{"iso":"eng"}],"keyword":["General Physics and Astronomy","General Engineering","Biochemistry","Genetics and Molecular Biology (miscellaneous)","General Materials Science","General Chemical Engineering","Medicine (miscellaneous)"],"article_number":"2203588","issue":"29","publication_identifier":{"issn":["2198-3844","2198-3844"]},"publication_status":"published","intvolume":"         9","citation":{"mla":"Long, Teng, et al. “Helical Polariton Lasing from Topological Valleys in an Organic Crystalline Microcavity.” <i>Advanced Science</i>, vol. 9, no. 29, 2203588, Wiley, 2022, doi:<a href=\"https://doi.org/10.1002/advs.202203588\">10.1002/advs.202203588</a>.","short":"T. Long, X. Ma, J. Ren, F. Li, Q. Liao, S. Schumacher, G. Malpuech, D. Solnyshkov, H. Fu, Advanced Science 9 (2022).","bibtex":"@article{Long_Ma_Ren_Li_Liao_Schumacher_Malpuech_Solnyshkov_Fu_2022, title={Helical Polariton Lasing from Topological Valleys in an Organic Crystalline Microcavity}, volume={9}, DOI={<a href=\"https://doi.org/10.1002/advs.202203588\">10.1002/advs.202203588</a>}, number={292203588}, journal={Advanced Science}, publisher={Wiley}, author={Long, Teng and Ma, Xuekai and Ren, Jiahuan and Li, Feng and Liao, Qing and Schumacher, Stefan and Malpuech, Guillaume and Solnyshkov, Dmitry and Fu, Hongbing}, year={2022} }","apa":"Long, T., Ma, X., Ren, J., Li, F., Liao, Q., Schumacher, S., Malpuech, G., Solnyshkov, D., &#38; Fu, H. (2022). Helical Polariton Lasing from Topological Valleys in an Organic Crystalline Microcavity. <i>Advanced Science</i>, <i>9</i>(29), Article 2203588. <a href=\"https://doi.org/10.1002/advs.202203588\">https://doi.org/10.1002/advs.202203588</a>","ama":"Long T, Ma X, Ren J, et al. Helical Polariton Lasing from Topological Valleys in an Organic Crystalline Microcavity. <i>Advanced Science</i>. 2022;9(29). doi:<a href=\"https://doi.org/10.1002/advs.202203588\">10.1002/advs.202203588</a>","chicago":"Long, Teng, Xuekai Ma, Jiahuan Ren, Feng Li, Qing Liao, Stefan Schumacher, Guillaume Malpuech, Dmitry Solnyshkov, and Hongbing Fu. “Helical Polariton Lasing from Topological Valleys in an Organic Crystalline Microcavity.” <i>Advanced Science</i> 9, no. 29 (2022). <a href=\"https://doi.org/10.1002/advs.202203588\">https://doi.org/10.1002/advs.202203588</a>.","ieee":"T. Long <i>et al.</i>, “Helical Polariton Lasing from Topological Valleys in an Organic Crystalline Microcavity,” <i>Advanced Science</i>, vol. 9, no. 29, Art. no. 2203588, 2022, doi: <a href=\"https://doi.org/10.1002/advs.202203588\">10.1002/advs.202203588</a>."},"year":"2022","volume":9,"author":[{"first_name":"Teng","last_name":"Long","full_name":"Long, Teng"},{"first_name":"Xuekai","id":"59416","full_name":"Ma, Xuekai","last_name":"Ma"},{"first_name":"Jiahuan","full_name":"Ren, Jiahuan","last_name":"Ren"},{"full_name":"Li, Feng","last_name":"Li","first_name":"Feng"},{"last_name":"Liao","full_name":"Liao, Qing","first_name":"Qing"},{"orcid":"0000-0003-4042-4951","last_name":"Schumacher","full_name":"Schumacher, Stefan","id":"27271","first_name":"Stefan"},{"first_name":"Guillaume","last_name":"Malpuech","full_name":"Malpuech, Guillaume"},{"first_name":"Dmitry","full_name":"Solnyshkov, Dmitry","last_name":"Solnyshkov"},{"full_name":"Fu, Hongbing","last_name":"Fu","first_name":"Hongbing"}],"date_created":"2022-08-22T19:05:04Z","publisher":"Wiley","date_updated":"2025-12-05T13:56:26Z","doi":"10.1002/advs.202203588","title":"Helical Polariton Lasing from Topological Valleys in an Organic Crystalline Microcavity"},{"project":[{"_id":"53","name":"TRR 142: TRR 142"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"_id":"61","name":"TRR 142 - A4: TRR 142 - Subproject A4"},{"_id":"53","name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"}],"_id":"32310","user_id":"16199","department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"705"},{"_id":"230"},{"_id":"429"},{"_id":"623"},{"_id":"35"}],"article_number":"3785","keyword":["General Physics and Astronomy","General Biochemistry","Genetics and Molecular Biology","General Chemistry","Multidisciplinary"],"language":[{"iso":"eng"}],"type":"journal_article","publication":"Nature Communications","status":"public","date_updated":"2025-12-05T13:54:19Z","publisher":"Springer Science and Business Media LLC","author":[{"last_name":"Li","full_name":"Li, Yao","first_name":"Yao"},{"first_name":"Xuekai","last_name":"Ma","full_name":"Ma, Xuekai","id":"59416"},{"full_name":"Zhai, Xiaokun","last_name":"Zhai","first_name":"Xiaokun"},{"last_name":"Gao","full_name":"Gao, Meini","first_name":"Meini"},{"first_name":"Haitao","last_name":"Dai","full_name":"Dai, Haitao"},{"first_name":"Stefan","orcid":"0000-0003-4042-4951","last_name":"Schumacher","full_name":"Schumacher, Stefan","id":"27271"},{"first_name":"Tingge","last_name":"Gao","full_name":"Gao, Tingge"}],"date_created":"2022-07-01T09:12:53Z","volume":13,"title":"Manipulating polariton condensates by Rashba-Dresselhaus coupling at room temperature","doi":"10.1038/s41467-022-31529-4","publication_status":"published","publication_identifier":{"issn":["2041-1723"]},"issue":"1","year":"2022","citation":{"apa":"Li, Y., Ma, X., Zhai, X., Gao, M., Dai, H., Schumacher, S., &#38; Gao, T. (2022). Manipulating polariton condensates by Rashba-Dresselhaus coupling at room temperature. <i>Nature Communications</i>, <i>13</i>(1), Article 3785. <a href=\"https://doi.org/10.1038/s41467-022-31529-4\">https://doi.org/10.1038/s41467-022-31529-4</a>","bibtex":"@article{Li_Ma_Zhai_Gao_Dai_Schumacher_Gao_2022, title={Manipulating polariton condensates by Rashba-Dresselhaus coupling at room temperature}, volume={13}, DOI={<a href=\"https://doi.org/10.1038/s41467-022-31529-4\">10.1038/s41467-022-31529-4</a>}, number={13785}, journal={Nature Communications}, publisher={Springer Science and Business Media LLC}, author={Li, Yao and Ma, Xuekai and Zhai, Xiaokun and Gao, Meini and Dai, Haitao and Schumacher, Stefan and Gao, Tingge}, year={2022} }","short":"Y. Li, X. Ma, X. Zhai, M. Gao, H. Dai, S. Schumacher, T. Gao, Nature Communications 13 (2022).","mla":"Li, Yao, et al. “Manipulating Polariton Condensates by Rashba-Dresselhaus Coupling at Room Temperature.” <i>Nature Communications</i>, vol. 13, no. 1, 3785, Springer Science and Business Media LLC, 2022, doi:<a href=\"https://doi.org/10.1038/s41467-022-31529-4\">10.1038/s41467-022-31529-4</a>.","chicago":"Li, Yao, Xuekai Ma, Xiaokun Zhai, Meini Gao, Haitao Dai, Stefan Schumacher, and Tingge Gao. “Manipulating Polariton Condensates by Rashba-Dresselhaus Coupling at Room Temperature.” <i>Nature Communications</i> 13, no. 1 (2022). <a href=\"https://doi.org/10.1038/s41467-022-31529-4\">https://doi.org/10.1038/s41467-022-31529-4</a>.","ieee":"Y. Li <i>et al.</i>, “Manipulating polariton condensates by Rashba-Dresselhaus coupling at room temperature,” <i>Nature Communications</i>, vol. 13, no. 1, Art. no. 3785, 2022, doi: <a href=\"https://doi.org/10.1038/s41467-022-31529-4\">10.1038/s41467-022-31529-4</a>.","ama":"Li Y, Ma X, Zhai X, et al. Manipulating polariton condensates by Rashba-Dresselhaus coupling at room temperature. <i>Nature Communications</i>. 2022;13(1). doi:<a href=\"https://doi.org/10.1038/s41467-022-31529-4\">10.1038/s41467-022-31529-4</a>"},"intvolume":"        13"},{"author":[{"last_name":"Gao","full_name":"Gao, Xinghui","first_name":"Xinghui"},{"last_name":"Hu","full_name":"Hu, Wei","first_name":"Wei"},{"first_name":"Stefan","last_name":"Schumacher","orcid":"0000-0003-4042-4951","id":"27271","full_name":"Schumacher, Stefan"},{"first_name":"Xuekai","full_name":"Ma, Xuekai","id":"59416","last_name":"Ma"}],"date_created":"2022-06-24T07:38:11Z","volume":47,"publisher":"Optica Publishing Group","date_updated":"2025-12-05T13:55:22Z","doi":"10.1364/ol.457724","title":"Unidirectional vortex waveguides and multistable vortex pairs in polariton condensates","issue":"13","publication_status":"published","publication_identifier":{"issn":["0146-9592","1539-4794"]},"citation":{"apa":"Gao, X., Hu, W., Schumacher, S., &#38; Ma, X. (2022). Unidirectional vortex waveguides and multistable vortex pairs in polariton condensates. <i>Optics Letters</i>, <i>47</i>(13), 3235–3238. <a href=\"https://doi.org/10.1364/ol.457724\">https://doi.org/10.1364/ol.457724</a>","mla":"Gao, Xinghui, et al. “Unidirectional Vortex Waveguides and Multistable Vortex Pairs in Polariton Condensates.” <i>Optics Letters</i>, vol. 47, no. 13, Optica Publishing Group, 2022, pp. 3235–38, doi:<a href=\"https://doi.org/10.1364/ol.457724\">10.1364/ol.457724</a>.","short":"X. Gao, W. Hu, S. Schumacher, X. Ma, Optics Letters 47 (2022) 3235–3238.","bibtex":"@article{Gao_Hu_Schumacher_Ma_2022, title={Unidirectional vortex waveguides and multistable vortex pairs in polariton condensates}, volume={47}, DOI={<a href=\"https://doi.org/10.1364/ol.457724\">10.1364/ol.457724</a>}, number={13}, journal={Optics Letters}, publisher={Optica Publishing Group}, author={Gao, Xinghui and Hu, Wei and Schumacher, Stefan and Ma, Xuekai}, year={2022}, pages={3235–3238} }","ama":"Gao X, Hu W, Schumacher S, Ma X. Unidirectional vortex waveguides and multistable vortex pairs in polariton condensates. <i>Optics Letters</i>. 2022;47(13):3235-3238. doi:<a href=\"https://doi.org/10.1364/ol.457724\">10.1364/ol.457724</a>","ieee":"X. Gao, W. Hu, S. Schumacher, and X. Ma, “Unidirectional vortex waveguides and multistable vortex pairs in polariton condensates,” <i>Optics Letters</i>, vol. 47, no. 13, pp. 3235–3238, 2022, doi: <a href=\"https://doi.org/10.1364/ol.457724\">10.1364/ol.457724</a>.","chicago":"Gao, Xinghui, Wei Hu, Stefan Schumacher, and Xuekai Ma. “Unidirectional Vortex Waveguides and Multistable Vortex Pairs in Polariton Condensates.” <i>Optics Letters</i> 47, no. 13 (2022): 3235–38. <a href=\"https://doi.org/10.1364/ol.457724\">https://doi.org/10.1364/ol.457724</a>."},"intvolume":"        47","page":"3235-3238","year":"2022","user_id":"16199","department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"705"},{"_id":"230"},{"_id":"429"},{"_id":"35"}],"project":[{"_id":"53","name":"TRR 142: TRR 142"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"_id":"61","name":"TRR 142 - A4: TRR 142 - Subproject A4"},{"name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"}],"_id":"32148","language":[{"iso":"eng"}],"keyword":["Atomic and Molecular Physics","and Optics"],"type":"journal_article","publication":"Optics Letters","status":"public"},{"ddc":["530"],"language":[{"iso":"eng"}],"publication":"New Trends in Lithium Niobate: From Bulk to Nanocrystals","abstract":[{"text":"Lithium niobate (LiNbO3), a material frequently used in optical applications, hosts different kinds of polarons that significantly affect many of its physical properties. In this study, a variety of electron polarons, namely free, bound, and bipolarons, are analyzed using first-principles calculations. We perform a full structural optimization based on density-functional theory for selected intrinsic defects with special attention to the role of symmetry-breaking distortions that lower the total energy. The cations hosting the various polarons relax to a different degree, with a larger relaxation corresponding to a larger gap between the defect level and the conduction-band edge. The projected density of states reveals that the polaron states are formerly empty Nb 4d states lowered into the band gap. Optical absorption spectra are derived within the independent-particle approximation, corrected by the GW approximation that yields a wider band gap and by including excitonic effects within the Bethe-Salpeter equation. Comparing the calculated spectra with the density of states, we find that the defect peak observed in the optical absorption stems from transitions between the defect level and a continuum of empty Nb 4d states. Signatures of polarons are further analyzed in the reflectivity and other experimentally measurable optical coefficients.","lang":"eng"}],"publisher":"MDPI","date_created":"2022-03-13T15:28:47Z","title":"Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response","quality_controlled":"1","year":"2022","project":[{"name":"TRR 142: TRR 142","_id":"53"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"_id":"69","name":"TRR 142 - B4: TRR 142 - Subproject B4"},{"_id":"54","name":"TRR 142 - A: TRR 142 - Project Area A"},{"_id":"166","name":"TRR 142 - A11: TRR 142 - Subproject A11"},{"name":"TRR 142 - B07: TRR 142 - Subproject B07","_id":"168"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"_id":"53","name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"}],"_id":"30288","user_id":"16199","department":[{"_id":"296"},{"_id":"230"},{"_id":"429"},{"_id":"295"},{"_id":"15"},{"_id":"170"},{"_id":"35"},{"_id":"790"}],"type":"book_chapter","editor":[{"full_name":"Corradi, Gábor","last_name":"Corradi","first_name":"Gábor"},{"first_name":"László","full_name":"Kovács, László","last_name":"Kovács"}],"status":"public","date_updated":"2025-12-05T14:00:04Z","author":[{"full_name":"Schmidt, Falko","id":"35251","last_name":"Schmidt","orcid":"0000-0002-5071-5528","first_name":"Falko"},{"first_name":"Agnieszka L.","full_name":"Kozub, Agnieszka L.","id":"77566","last_name":"Kozub","orcid":"https://orcid.org/0000-0001-6584-0201"},{"first_name":"Uwe","last_name":"Gerstmann","orcid":"0000-0002-4476-223X","id":"171","full_name":"Gerstmann, Uwe"},{"last_name":"Schmidt","orcid":"0000-0002-2717-5076","id":"468","full_name":"Schmidt, Wolf Gero","first_name":"Wolf Gero"},{"first_name":"Arno","last_name":"Schindlmayr","orcid":"0000-0002-4855-071X","id":"458","full_name":"Schindlmayr, Arno"}],"doi":"10.3390/books978-3-0365-3339-1","publication_status":"published","publication_identifier":{"eisbn":["978-3-0365-3339-1"],"isbn":["978-3-0365-3340-7"]},"place":"Basel","citation":{"ieee":"F. Schmidt, A. L. Kozub, U. Gerstmann, W. G. Schmidt, and A. Schindlmayr, “Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response,” in <i>New Trends in Lithium Niobate: From Bulk to Nanocrystals</i>, G. Corradi and L. Kovács, Eds. Basel: MDPI, 2022, pp. 231–248.","chicago":"Schmidt, Falko, Agnieszka L. Kozub, Uwe Gerstmann, Wolf Gero Schmidt, and Arno Schindlmayr. “Electron Polarons in Lithium Niobate: Charge Localization, Lattice Deformation, and Optical Response.” In <i>New Trends in Lithium Niobate: From Bulk to Nanocrystals</i>, edited by Gábor Corradi and László Kovács, 231–48. Basel: MDPI, 2022. <a href=\"https://doi.org/10.3390/books978-3-0365-3339-1\">https://doi.org/10.3390/books978-3-0365-3339-1</a>.","ama":"Schmidt F, Kozub AL, Gerstmann U, Schmidt WG, Schindlmayr A. Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response. In: Corradi G, Kovács L, eds. <i>New Trends in Lithium Niobate: From Bulk to Nanocrystals</i>. MDPI; 2022:231-248. doi:<a href=\"https://doi.org/10.3390/books978-3-0365-3339-1\">10.3390/books978-3-0365-3339-1</a>","mla":"Schmidt, Falko, et al. “Electron Polarons in Lithium Niobate: Charge Localization, Lattice Deformation, and Optical Response.” <i>New Trends in Lithium Niobate: From Bulk to Nanocrystals</i>, edited by Gábor Corradi and László Kovács, MDPI, 2022, pp. 231–48, doi:<a href=\"https://doi.org/10.3390/books978-3-0365-3339-1\">10.3390/books978-3-0365-3339-1</a>.","bibtex":"@inbook{Schmidt_Kozub_Gerstmann_Schmidt_Schindlmayr_2022, place={Basel}, title={Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response}, DOI={<a href=\"https://doi.org/10.3390/books978-3-0365-3339-1\">10.3390/books978-3-0365-3339-1</a>}, booktitle={New Trends in Lithium Niobate: From Bulk to Nanocrystals}, publisher={MDPI}, author={Schmidt, Falko and Kozub, Agnieszka L. and Gerstmann, Uwe and Schmidt, Wolf Gero and Schindlmayr, Arno}, editor={Corradi, Gábor and Kovács, László}, year={2022}, pages={231–248} }","short":"F. Schmidt, A.L. Kozub, U. Gerstmann, W.G. Schmidt, A. Schindlmayr, in: G. Corradi, L. Kovács (Eds.), New Trends in Lithium Niobate: From Bulk to Nanocrystals, MDPI, Basel, 2022, pp. 231–248.","apa":"Schmidt, F., Kozub, A. L., Gerstmann, U., Schmidt, W. G., &#38; Schindlmayr, A. (2022). Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response. In G. Corradi &#38; L. Kovács (Eds.), <i>New Trends in Lithium Niobate: From Bulk to Nanocrystals</i> (pp. 231–248). MDPI. <a href=\"https://doi.org/10.3390/books978-3-0365-3339-1\">https://doi.org/10.3390/books978-3-0365-3339-1</a>"},"page":"231-248"},{"status":"public","type":"conference","language":[{"iso":"ger"}],"department":[{"_id":"623"},{"_id":"15"},{"_id":"429"},{"_id":"642"}],"user_id":"48188","series_title":"Materials for Quantum Technology","_id":"41800","intvolume":"         2","citation":{"ama":"Sartison M,  Camacho Ibarra O, Jöns KD, Caltzidis I, Reuter D. Scalable integration of quantum emitters into photonic integrated circuits. 2022;2. doi:<a href=\"https://doi.org/10.1088/2633-4356/ac6f3e\">https://doi.org/10.1088/2633-4356/ac6f3e</a>","chicago":"Sartison, M, O  Camacho Ibarra, Klaus D. Jöns, I Caltzidis, and Dirk Reuter. “Scalable integration of quantum emitters into photonic integrated circuits.” Materials for Quantum Technology, 2022. <a href=\"https://doi.org/10.1088/2633-4356/ac6f3e\">https://doi.org/10.1088/2633-4356/ac6f3e</a>.","ieee":"M. Sartison, O.  Camacho Ibarra, K. D. Jöns, I. Caltzidis, and D. Reuter, “Scalable integration of quantum emitters into photonic integrated circuits,” vol. 2. 2022, doi: <a href=\"https://doi.org/10.1088/2633-4356/ac6f3e\">https://doi.org/10.1088/2633-4356/ac6f3e</a>.","short":"M. Sartison, O.  Camacho Ibarra, K.D. Jöns, I. Caltzidis, D. Reuter, 2 (2022).","bibtex":"@article{Sartison_ Camacho Ibarra_Jöns_Caltzidis_Reuter_2022, series={Materials for Quantum Technology}, title={Scalable integration of quantum emitters into photonic integrated circuits}, volume={2}, DOI={<a href=\"https://doi.org/10.1088/2633-4356/ac6f3e\">https://doi.org/10.1088/2633-4356/ac6f3e</a>}, author={Sartison, M and  Camacho Ibarra, O and Jöns, Klaus D. and Caltzidis, I and Reuter, Dirk}, year={2022}, collection={Materials for Quantum Technology} }","mla":"Sartison, M., et al. <i>Scalable integration of quantum emitters into photonic integrated circuits</i>. 2022, doi:<a href=\"https://doi.org/10.1088/2633-4356/ac6f3e\">https://doi.org/10.1088/2633-4356/ac6f3e</a>.","apa":"Sartison, M.,  Camacho Ibarra, O., Jöns, K. D., Caltzidis, I., &#38; Reuter, D. (2022). <i>Scalable integration of quantum emitters into photonic integrated circuits</i> (Vol. 2). <a href=\"https://doi.org/10.1088/2633-4356/ac6f3e\">https://doi.org/10.1088/2633-4356/ac6f3e</a>"},"year":"2022","publication_status":"published","doi":"https://doi.org/10.1088/2633-4356/ac6f3e","title":"Scalable integration of quantum emitters into photonic integrated circuits","volume":2,"date_created":"2023-02-06T02:30:08Z","author":[{"last_name":"Sartison","full_name":"Sartison, M","first_name":"M"},{"first_name":"O","full_name":" Camacho Ibarra, O","last_name":" Camacho Ibarra"},{"first_name":"Klaus D.","last_name":"Jöns","id":"85353","full_name":"Jöns, Klaus D."},{"full_name":"Caltzidis, I","last_name":"Caltzidis","first_name":"I"},{"first_name":"Dirk","full_name":"Reuter, Dirk","id":"37763","last_name":"Reuter"}],"date_updated":"2025-12-11T13:09:55Z"},{"status":"public","abstract":[{"text":"<jats:p>Multimode integrated interferometers have great potential for both spectral engineering and metrological applications. However, the material dispersion of integrated platforms constitutes an obstacle that limits the performance and precision of such interferometers. At the same time, two-colour nonlinear interferometers present an important tool for metrological applications, when measurements in a certain frequency range are difficult. In this manuscript, we theoretically developed and investigated an integrated multimode two-colour SU(1,1) interferometer operating in a supersensitive mode. By ensuring the proper design of the integrated platform, we suppressed the dispersion, thereby significantly increasing the visibility of the interference pattern. The use of a continuous wave pump laser provided the symmetry between the spectral shapes of the signal and idler photons concerning half the pump frequency, despite different photon colours. We demonstrate that such an interferometer overcomes the classical phase sensitivity limit for wide parametric gain ranges, when up to 3×104 photons are generated.</jats:p>","lang":"eng"}],"type":"journal_article","publication":"Symmetry","language":[{"iso":"eng"}],"article_number":"552","keyword":["Physics and Astronomy (miscellaneous)","General Mathematics","Chemistry (miscellaneous)","Computer Science (miscellaneous)"],"user_id":"16199","department":[{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"429"},{"_id":"230"},{"_id":"9"},{"_id":"27"}],"project":[{"name":"TRR 142: TRR 142","_id":"53"},{"_id":"56","name":"TRR 142 - C: TRR 142 - Project Area C"},{"_id":"72","name":"TRR 142 - C2: TRR 142 - Subproject C2"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"_id":"40371","citation":{"chicago":"Ferreri, Alessandro, and Polina R. Sharapova. “Two-Colour Spectrally Multimode Integrated SU(1,1) Interferometer.” <i>Symmetry</i> 14, no. 3 (2022). <a href=\"https://doi.org/10.3390/sym14030552\">https://doi.org/10.3390/sym14030552</a>.","ieee":"A. Ferreri and P. R. Sharapova, “Two-Colour Spectrally Multimode Integrated SU(1,1) Interferometer,” <i>Symmetry</i>, vol. 14, no. 3, Art. no. 552, 2022, doi: <a href=\"https://doi.org/10.3390/sym14030552\">10.3390/sym14030552</a>.","ama":"Ferreri A, Sharapova PR. Two-Colour Spectrally Multimode Integrated SU(1,1) Interferometer. <i>Symmetry</i>. 2022;14(3). doi:<a href=\"https://doi.org/10.3390/sym14030552\">10.3390/sym14030552</a>","bibtex":"@article{Ferreri_Sharapova_2022, title={Two-Colour Spectrally Multimode Integrated SU(1,1) Interferometer}, volume={14}, DOI={<a href=\"https://doi.org/10.3390/sym14030552\">10.3390/sym14030552</a>}, number={3552}, journal={Symmetry}, publisher={MDPI AG}, author={Ferreri, Alessandro and Sharapova, Polina R.}, year={2022} }","mla":"Ferreri, Alessandro, and Polina R. Sharapova. “Two-Colour Spectrally Multimode Integrated SU(1,1) Interferometer.” <i>Symmetry</i>, vol. 14, no. 3, 552, MDPI AG, 2022, doi:<a href=\"https://doi.org/10.3390/sym14030552\">10.3390/sym14030552</a>.","short":"A. Ferreri, P.R. Sharapova, Symmetry 14 (2022).","apa":"Ferreri, A., &#38; Sharapova, P. R. (2022). Two-Colour Spectrally Multimode Integrated SU(1,1) Interferometer. <i>Symmetry</i>, <i>14</i>(3), Article 552. <a href=\"https://doi.org/10.3390/sym14030552\">https://doi.org/10.3390/sym14030552</a>"},"intvolume":"        14","year":"2022","issue":"3","publication_status":"published","publication_identifier":{"issn":["2073-8994"]},"doi":"10.3390/sym14030552","title":"Two-Colour Spectrally Multimode Integrated SU(1,1) Interferometer","author":[{"first_name":"Alessandro","full_name":"Ferreri, Alessandro","last_name":"Ferreri"},{"last_name":"Sharapova","id":"60286","full_name":"Sharapova, Polina R.","first_name":"Polina R."}],"date_created":"2023-01-26T13:54:00Z","volume":14,"publisher":"MDPI AG","date_updated":"2025-12-16T11:27:11Z"},{"related_material":{"link":[{"relation":"erratum","description":"Corrigendum for table C1","url":"https://doi.org/10.1088/2515-7647/acc70c"}]},"publication_identifier":{"issn":["2515-7647"]},"publication_status":"published","intvolume":"         4","page":"025001","citation":{"ieee":"L. Ebers <i>et al.</i>, “Flexible source of correlated photons based on LNOI rib waveguides,” <i>Journal of Physics: Photonics</i>, vol. 4, p. 025001, 2022, doi: <a href=\"https://doi.org/10.1088/2515-7647/ac5a5b\">10.1088/2515-7647/ac5a5b</a>.","chicago":"Ebers, Lena, Alessandro Ferreri, Manfred Hammer, Maximilian Albert, Cedrik Meier, Jens Förstner, and Polina R. Sharapova. “Flexible Source of Correlated Photons Based on LNOI Rib Waveguides.” <i>Journal of Physics: Photonics</i> 4 (2022): 025001. <a href=\"https://doi.org/10.1088/2515-7647/ac5a5b\">https://doi.org/10.1088/2515-7647/ac5a5b</a>.","ama":"Ebers L, Ferreri A, Hammer M, et al. Flexible source of correlated photons based on LNOI rib waveguides. <i>Journal of Physics: Photonics</i>. 2022;4:025001. doi:<a href=\"https://doi.org/10.1088/2515-7647/ac5a5b\">10.1088/2515-7647/ac5a5b</a>","short":"L. Ebers, A. Ferreri, M. Hammer, M. Albert, C. Meier, J. Förstner, P.R. Sharapova, Journal of Physics: Photonics 4 (2022) 025001.","mla":"Ebers, Lena, et al. “Flexible Source of Correlated Photons Based on LNOI Rib Waveguides.” <i>Journal of Physics: Photonics</i>, vol. 4, IOP Publishing, 2022, p. 025001, doi:<a href=\"https://doi.org/10.1088/2515-7647/ac5a5b\">10.1088/2515-7647/ac5a5b</a>.","bibtex":"@article{Ebers_Ferreri_Hammer_Albert_Meier_Förstner_Sharapova_2022, title={Flexible source of correlated photons based on LNOI rib waveguides}, volume={4}, DOI={<a href=\"https://doi.org/10.1088/2515-7647/ac5a5b\">10.1088/2515-7647/ac5a5b</a>}, journal={Journal of Physics: Photonics}, publisher={IOP Publishing}, author={Ebers, Lena and Ferreri, Alessandro and Hammer, Manfred and Albert, Maximilian and Meier, Cedrik and Förstner, Jens and Sharapova, Polina R.}, year={2022}, pages={025001} }","apa":"Ebers, L., Ferreri, A., Hammer, M., Albert, M., Meier, C., Förstner, J., &#38; Sharapova, P. R. (2022). Flexible source of correlated photons based on LNOI rib waveguides. <i>Journal of Physics: Photonics</i>, <i>4</i>, 025001. <a href=\"https://doi.org/10.1088/2515-7647/ac5a5b\">https://doi.org/10.1088/2515-7647/ac5a5b</a>"},"year":"2022","volume":4,"author":[{"id":"40428","full_name":"Ebers, Lena","last_name":"Ebers","first_name":"Lena"},{"id":"65609","full_name":"Ferreri, Alessandro","last_name":"Ferreri","first_name":"Alessandro"},{"first_name":"Manfred","last_name":"Hammer","orcid":"0000-0002-6331-9348","id":"48077","full_name":"Hammer, Manfred"},{"first_name":"Maximilian","full_name":"Albert, Maximilian","last_name":"Albert"},{"first_name":"Cedrik","orcid":"https://orcid.org/0000-0002-3787-3572","last_name":"Meier","full_name":"Meier, Cedrik","id":"20798"},{"full_name":"Förstner, Jens","id":"158","last_name":"Förstner","orcid":"0000-0001-7059-9862","first_name":"Jens"},{"first_name":"Polina R.","id":"60286","full_name":"Sharapova, Polina R.","last_name":"Sharapova"}],"date_created":"2022-03-07T09:51:50Z","publisher":"IOP Publishing","date_updated":"2025-12-16T11:31:04Z","doi":"10.1088/2515-7647/ac5a5b","title":"Flexible source of correlated photons based on LNOI rib waveguides","publication":"Journal of Physics: Photonics","type":"journal_article","status":"public","abstract":[{"text":"Lithium niobate on insulator (LNOI) has a great potential for photonic integrated circuits, providing substantial versatility in design of various integrated components. To properly use these components in the implementation of different quantum protocols, photons with different properties are required. In this paper, we theoretically demonstrate a flexible source of correlated photons built on the LNOI waveguide of a special geometry. This source is based on the parametric down-conversion (PDC) process, in which the signal and idler photons are generated at the telecom wavelength and have different spatial profiles and polarizations, but the same group velocities. Distinguishability in polarizations and spatial profiles facilitates the routing and manipulating individual photons, while the equality of their group velocities leads to the absence of temporal walk-off between photons. We show how the spectral properties of the generated photons and the number of their frequency modes can be controlled depending on the pump characteristics and the waveguide length. Finally, we discuss special regimes, in which narrowband light with strong frequency correlations and polarization-entangled Bell states are generated at the telecom wavelength.","lang":"eng"}],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"287"},{"_id":"35"},{"_id":"34"}],"user_id":"16199","_id":"30210","project":[{"name":"TRR 142 - C: TRR 142 - Project Area C","_id":"56"},{"_id":"75","name":"TRR 142 - C5: TRR 142 - Subproject C5"},{"_id":"72","name":"TRR 142 - C2: TRR 142 - Subproject C2"},{"name":"TRR 142: TRR 142","_id":"53"},{"_id":"53","name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"}],"language":[{"iso":"eng"}],"keyword":["tet_topic_waveguide"]},{"publisher":"American Physical Society (APS)","date_created":"2022-04-20T06:38:07Z","title":"Driven Gaussian quantum walks","issue":"4","year":"2022","language":[{"iso":"eng"}],"publication":"Physical Review A","abstract":[{"text":"Quantum walks function as essential means to implement quantum simulators, allowing one to study complex and often directly inaccessible quantum processes in controllable systems. In this contribution, the notion of a driven Gaussian quantum walk is introduced. In contrast to typically considered quantum walks in optical settings, we describe the operation of the walk in terms of a nonlinear map rather than a unitary operation, e.g., by replacing a beam-splitter-type coin with a two-mode squeezer, being a process that is controlled and driven by a pump field. This opens previously unattainable possibilities for quantum walks that include nonlinear elements as core components of their operation, vastly extending their range of applications. A full framework for driven Gaussian quantum walks is developed, including methods to dynamically characterize nonlinear, quantum, and quantum-nonlinear effects. Moreover, driven Gaussian quantum walks are compared with their classically interfering and linear counterparts, which are based on classical coherence of light rather than quantum superpositions. In particular, the generation and boost of highly multimode entanglement, squeezing, and other quantum effects are studied over the duration of the nonlinear walk. Importantly, we prove the quantumness of the evolution itself, regardless of the input state. A scheme for an experimental realization is proposed. Furthermore, nonlinear properties of driven Gaussian quantum walks are explored, such as amplification that leads to an ever increasing number of correlated quantum particles, constituting a source of new walkers during the walk. Therefore, a concept for quantum walks is proposed that leads to—and even produces—directly accessible quantum phenomena, and that renders the quantum simulation of nonlinear processes possible.","lang":"eng"}],"date_updated":"2026-01-09T09:50:22Z","author":[{"first_name":"Philip","id":"68236","full_name":"Held, Philip","last_name":"Held"},{"full_name":"Engelkemeier, Melanie","last_name":"Engelkemeier","first_name":"Melanie"},{"first_name":"Syamsundar","full_name":"De, Syamsundar","last_name":"De"},{"last_name":"Barkhofen","id":"48188","full_name":"Barkhofen, Sonja","first_name":"Sonja"},{"last_name":"Sperling","orcid":"0000-0002-5844-3205","id":"75127","full_name":"Sperling, Jan","first_name":"Jan"},{"id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine"}],"volume":105,"main_file_link":[{"url":"https://journals.aps.org/pra/abstract/10.1103/PhysRevA.105.042210"}],"doi":"10.1103/physreva.105.042210","publication_status":"published","publication_identifier":{"issn":["2469-9926","2469-9934"]},"citation":{"chicago":"Held, Philip, Melanie Engelkemeier, Syamsundar De, Sonja Barkhofen, Jan Sperling, and Christine Silberhorn. “Driven Gaussian Quantum Walks.” <i>Physical Review A</i> 105, no. 4 (2022). <a href=\"https://doi.org/10.1103/physreva.105.042210\">https://doi.org/10.1103/physreva.105.042210</a>.","ieee":"P. Held, M. Engelkemeier, S. De, S. Barkhofen, J. Sperling, and C. Silberhorn, “Driven Gaussian quantum walks,” <i>Physical Review A</i>, vol. 105, no. 4, Art. no. 042210, 2022, doi: <a href=\"https://doi.org/10.1103/physreva.105.042210\">10.1103/physreva.105.042210</a>.","ama":"Held P, Engelkemeier M, De S, Barkhofen S, Sperling J, Silberhorn C. Driven Gaussian quantum walks. <i>Physical Review A</i>. 2022;105(4). doi:<a href=\"https://doi.org/10.1103/physreva.105.042210\">10.1103/physreva.105.042210</a>","bibtex":"@article{Held_Engelkemeier_De_Barkhofen_Sperling_Silberhorn_2022, title={Driven Gaussian quantum walks}, volume={105}, DOI={<a href=\"https://doi.org/10.1103/physreva.105.042210\">10.1103/physreva.105.042210</a>}, number={4042210}, journal={Physical Review A}, publisher={American Physical Society (APS)}, author={Held, Philip and Engelkemeier, Melanie and De, Syamsundar and Barkhofen, Sonja and Sperling, Jan and Silberhorn, Christine}, year={2022} }","short":"P. Held, M. Engelkemeier, S. De, S. Barkhofen, J. Sperling, C. Silberhorn, Physical Review A 105 (2022).","mla":"Held, Philip, et al. “Driven Gaussian Quantum Walks.” <i>Physical Review A</i>, vol. 105, no. 4, 042210, American Physical Society (APS), 2022, doi:<a href=\"https://doi.org/10.1103/physreva.105.042210\">10.1103/physreva.105.042210</a>.","apa":"Held, P., Engelkemeier, M., De, S., Barkhofen, S., Sperling, J., &#38; Silberhorn, C. (2022). Driven Gaussian quantum walks. <i>Physical Review A</i>, <i>105</i>(4), Article 042210. <a href=\"https://doi.org/10.1103/physreva.105.042210\">https://doi.org/10.1103/physreva.105.042210</a>"},"intvolume":"       105","project":[{"_id":"56","name":"TRR 142 - C: TRR 142 - Project Area C"},{"name":"TRR 142: TRR 142","_id":"53"}],"_id":"30921","user_id":"68236","department":[{"_id":"623"},{"_id":"15"},{"_id":"170"},{"_id":"706"},{"_id":"288"},{"_id":"230"},{"_id":"429"},{"_id":"35"}],"article_type":"original","article_number":"042210","type":"journal_article","status":"public"},{"title":"Influence of Plasmon Resonances and Symmetry Effects on Second Harmonic Generation in WS2–Plasmonic Hybrid Metasurfaces","date_created":"2021-10-07T07:39:27Z","year":"2021","quality_controlled":"1","issue":"10","language":[{"iso":"eng"}],"abstract":[{"text":"The nonlinear process of second harmonic generation (SHG) in monolayer (1L) transition metal dichalcogenides (TMD), like WS2, strongly depends on the polarization state of the excitation light. By combination of plasmonic nanostructures with 1L-WS2 by transferring it onto a plasmonic nanoantenna array, a hybrid metasurface is realized impacting the polarization dependency of its SHG. Here, we investigate how plasmonic dipole resonances affect the process of SHG in plasmonic–TMD hybrid metasurfaces by nonlinear spectroscopy. We show that the polarization dependency is affected by the lattice structure of plasmonic nanoantenna arrays as well as by the relative orientation between the 1L-WS2 and the individual plasmonic nanoantennas. In addition, such hybrid metasurfaces show SHG in polarization states, where SHG is usually forbidden for either 1L-WS2 or plasmonic nanoantennas. By comparing the SHG in these channels with the SHG generated by the hybrid metasurface components, we detect an enhancement of the SHG signal by a factor of more than 40. Meanwhile, an attenuation of the SHG signal in usually allowed polarization states is observed. Our study provides valuable insight into hybrid systems where symmetries strongly affect the SHG and enable tailored SHG in 1L-WS2 for future applications.","lang":"eng"}],"publication":"ACS Nano","doi":"10.1021/acsnano.1c06693","main_file_link":[{"url":"https://pubs.acs.org/doi/10.1021/acsnano.1c06693","open_access":"1"}],"date_updated":"2022-01-06T06:57:07Z","oa":"1","volume":15,"author":[{"full_name":"Spreyer, Florian","last_name":"Spreyer","first_name":"Florian"},{"first_name":"Claudia","full_name":"Ruppert, Claudia","last_name":"Ruppert"},{"full_name":"Georgi, Philip","last_name":"Georgi","first_name":"Philip"},{"first_name":"Thomas","last_name":"Zentgraf","orcid":"0000-0002-8662-1101","id":"30525","full_name":"Zentgraf, Thomas"}],"intvolume":"        15","page":"16719-16728","citation":{"short":"F. Spreyer, C. Ruppert, P. Georgi, T. Zentgraf, ACS Nano 15 (2021) 16719–16728.","bibtex":"@article{Spreyer_Ruppert_Georgi_Zentgraf_2021, title={Influence of Plasmon Resonances and Symmetry Effects on Second Harmonic Generation in WS2–Plasmonic Hybrid Metasurfaces}, volume={15}, DOI={<a href=\"https://doi.org/10.1021/acsnano.1c06693\">10.1021/acsnano.1c06693</a>}, number={10}, journal={ACS Nano}, author={Spreyer, Florian and Ruppert, Claudia and Georgi, Philip and Zentgraf, Thomas}, year={2021}, pages={16719–16728} }","mla":"Spreyer, Florian, et al. “Influence of Plasmon Resonances and Symmetry Effects on Second Harmonic Generation in WS2–Plasmonic Hybrid Metasurfaces.” <i>ACS Nano</i>, vol. 15, no. 10, 2021, pp. 16719–28, doi:<a href=\"https://doi.org/10.1021/acsnano.1c06693\">10.1021/acsnano.1c06693</a>.","apa":"Spreyer, F., Ruppert, C., Georgi, P., &#38; Zentgraf, T. (2021). Influence of Plasmon Resonances and Symmetry Effects on Second Harmonic Generation in WS2–Plasmonic Hybrid Metasurfaces. <i>ACS Nano</i>, <i>15</i>(10), 16719–16728. <a href=\"https://doi.org/10.1021/acsnano.1c06693\">https://doi.org/10.1021/acsnano.1c06693</a>","ieee":"F. Spreyer, C. Ruppert, P. Georgi, and T. Zentgraf, “Influence of Plasmon Resonances and Symmetry Effects on Second Harmonic Generation in WS2–Plasmonic Hybrid Metasurfaces,” <i>ACS Nano</i>, vol. 15, no. 10, pp. 16719–16728, 2021, doi: <a href=\"https://doi.org/10.1021/acsnano.1c06693\">10.1021/acsnano.1c06693</a>.","chicago":"Spreyer, Florian, Claudia Ruppert, Philip Georgi, and Thomas Zentgraf. “Influence of Plasmon Resonances and Symmetry Effects on Second Harmonic Generation in WS2–Plasmonic Hybrid Metasurfaces.” <i>ACS Nano</i> 15, no. 10 (2021): 16719–28. <a href=\"https://doi.org/10.1021/acsnano.1c06693\">https://doi.org/10.1021/acsnano.1c06693</a>.","ama":"Spreyer F, Ruppert C, Georgi P, Zentgraf T. Influence of Plasmon Resonances and Symmetry Effects on Second Harmonic Generation in WS2–Plasmonic Hybrid Metasurfaces. <i>ACS Nano</i>. 2021;15(10):16719-16728. doi:<a href=\"https://doi.org/10.1021/acsnano.1c06693\">10.1021/acsnano.1c06693</a>"},"publication_identifier":{"issn":["1936-0851","1936-086X"]},"publication_status":"published","article_type":"original","funded_apc":"1","_id":"25605","project":[{"name":"TRR 142","_id":"53"},{"name":"TRR 142 - Project Area A","_id":"54"},{"_id":"64","name":"TRR 142 - Subproject A7"},{"name":"TRR 142 - Subproject A8","_id":"65"}],"department":[{"_id":"15"},{"_id":"230"},{"_id":"289"}],"user_id":"30525","status":"public","type":"journal_article"},{"status":"public","abstract":[{"lang":"eng","text":"In this paper, silicon oxynitride films (SiON) grown by plasma-enhanced chemical vapor deposition are investigated. As precursor gases silane (SiH4), nitrous oxide (N2O), nitrogen (N2) and ammonia (NH3) are used with different compositions. We find that for achieving high nitrogen content adding ammonia to the precursor mix is most efficient. Moreover, we investigate the balance between adsorption and desorption processes during film growth by investigating the film growth rate as a function of the substrate temperature. From these data we are able to determine an effective activation energy for the film growth, corresponding to the difference between adsorption and desorption energy. Finally, we have thoroughly investigated the optical properties of the films using spectroscopic ellipsometry. From these measurements, we suggest a parametrized model for the refractive index and extinction coefficient in a wide range of compositions based on a Cauchy- and a Lorentz-fit."}],"publication":"Thin Solid Films","type":"journal_article","language":[{"iso":"eng"}],"article_number":"138887","article_type":"original","department":[{"_id":"15"}],"user_id":"20798","_id":"23815","project":[{"name":"TRR 142","_id":"53"},{"_id":"55","name":"TRR 142 - Project Area B"},{"_id":"66","name":"TRR 142 - Subproject B1"}],"intvolume":"       736","citation":{"ama":"Aschwanden R, Köthemann R, Albert M, Golla C, Meier C. Optical properties of silicon oxynitride films grown by plasma-enhanced chemical vapor deposition. <i>Thin Solid Films</i>. 2021;736. doi:<a href=\"https://doi.org/10.1016/j.tsf.2021.138887\">10.1016/j.tsf.2021.138887</a>","ieee":"R. Aschwanden, R. Köthemann, M. Albert, C. Golla, and C. Meier, “Optical properties of silicon oxynitride films grown by plasma-enhanced chemical vapor deposition,” <i>Thin Solid Films</i>, vol. 736, 2021.","chicago":"Aschwanden, R., R. Köthemann, M. Albert, C. Golla, and Cedrik Meier. “Optical Properties of Silicon Oxynitride Films Grown by Plasma-Enhanced Chemical Vapor Deposition.” <i>Thin Solid Films</i> 736 (2021). <a href=\"https://doi.org/10.1016/j.tsf.2021.138887\">https://doi.org/10.1016/j.tsf.2021.138887</a>.","apa":"Aschwanden, R., Köthemann, R., Albert, M., Golla, C., &#38; Meier, C. (2021). Optical properties of silicon oxynitride films grown by plasma-enhanced chemical vapor deposition. <i>Thin Solid Films</i>, <i>736</i>. <a href=\"https://doi.org/10.1016/j.tsf.2021.138887\">https://doi.org/10.1016/j.tsf.2021.138887</a>","mla":"Aschwanden, R., et al. “Optical Properties of Silicon Oxynitride Films Grown by Plasma-Enhanced Chemical Vapor Deposition.” <i>Thin Solid Films</i>, vol. 736, 138887, 2021, doi:<a href=\"https://doi.org/10.1016/j.tsf.2021.138887\">10.1016/j.tsf.2021.138887</a>.","short":"R. Aschwanden, R. Köthemann, M. Albert, C. Golla, C. Meier, Thin Solid Films 736 (2021).","bibtex":"@article{Aschwanden_Köthemann_Albert_Golla_Meier_2021, title={Optical properties of silicon oxynitride films grown by plasma-enhanced chemical vapor deposition}, volume={736}, DOI={<a href=\"https://doi.org/10.1016/j.tsf.2021.138887\">10.1016/j.tsf.2021.138887</a>}, number={138887}, journal={Thin Solid Films}, author={Aschwanden, R. and Köthemann, R. and Albert, M. and Golla, C. and Meier, Cedrik}, year={2021} }"},"year":"2021","publication_identifier":{"issn":["0040-6090"]},"publication_status":"published","doi":"10.1016/j.tsf.2021.138887","title":"Optical properties of silicon oxynitride films grown by plasma-enhanced chemical vapor deposition","volume":736,"author":[{"first_name":"R.","full_name":"Aschwanden, R.","last_name":"Aschwanden"},{"last_name":"Köthemann","full_name":"Köthemann, R.","first_name":"R."},{"last_name":"Albert","full_name":"Albert, M.","first_name":"M."},{"first_name":"C.","full_name":"Golla, C.","last_name":"Golla"},{"full_name":"Meier, Cedrik","id":"20798","last_name":"Meier","orcid":"https://orcid.org/0000-0002-3787-3572","first_name":"Cedrik"}],"date_created":"2021-09-06T15:11:54Z","date_updated":"2022-01-06T06:56:00Z"},{"publication_identifier":{"issn":["0022-3727","1361-6463"]},"publication_status":"published","citation":{"ama":"Baron E, Feneberg M, Goldhahn R, Deppe M, Tacken F, As DJ. Optical evidence of many-body effects in the zincblende Al$_\\mathrm{x}$Ga$_\\mathrm{1-x}$N alloy system. <i>Journal of Physics D: Applied Physics</i>. 2021. doi:<a href=\"https://doi.org/10.1088/1361-6463/abb97a\">10.1088/1361-6463/abb97a</a>","chicago":"Baron, Elias, Martin Feneberg, Rüdiger Goldhahn, Michael Deppe, Fabian Tacken, and Donat Josef As. “Optical Evidence of Many-Body Effects in the Zincblende Al$_\\mathrm{x}$Ga$_\\mathrm{1-X}$N Alloy System.” <i>Journal of Physics D: Applied Physics</i>, 2021. <a href=\"https://doi.org/10.1088/1361-6463/abb97a\">https://doi.org/10.1088/1361-6463/abb97a</a>.","ieee":"E. Baron, M. Feneberg, R. Goldhahn, M. Deppe, F. Tacken, and D. J. As, “Optical evidence of many-body effects in the zincblende Al$_\\mathrm{x}$Ga$_\\mathrm{1-x}$N alloy system,” <i>Journal of Physics D: Applied Physics</i>, 2021.","bibtex":"@article{Baron_Feneberg_Goldhahn_Deppe_Tacken_As_2021, title={Optical evidence of many-body effects in the zincblende Al$_\\mathrm{x}$Ga$_\\mathrm{1-x}$N alloy system}, DOI={<a href=\"https://doi.org/10.1088/1361-6463/abb97a\">10.1088/1361-6463/abb97a</a>}, number={025101}, journal={Journal of Physics D: Applied Physics}, author={Baron, Elias and Feneberg, Martin and Goldhahn, Rüdiger and Deppe, Michael and Tacken, Fabian and As, Donat Josef}, year={2021} }","mla":"Baron, Elias, et al. “Optical Evidence of Many-Body Effects in the Zincblende Al$_\\mathrm{x}$Ga$_\\mathrm{1-X}$N Alloy System.” <i>Journal of Physics D: Applied Physics</i>, 025101, 2021, doi:<a href=\"https://doi.org/10.1088/1361-6463/abb97a\">10.1088/1361-6463/abb97a</a>.","short":"E. Baron, M. Feneberg, R. Goldhahn, M. Deppe, F. Tacken, D.J. As, Journal of Physics D: Applied Physics (2021).","apa":"Baron, E., Feneberg, M., Goldhahn, R., Deppe, M., Tacken, F., &#38; As, D. J. (2021). Optical evidence of many-body effects in the zincblende Al$_\\mathrm{x}$Ga$_\\mathrm{1-x}$N alloy system. <i>Journal of Physics D: Applied Physics</i>. <a href=\"https://doi.org/10.1088/1361-6463/abb97a\">https://doi.org/10.1088/1361-6463/abb97a</a>"},"year":"2021","author":[{"first_name":"Elias","last_name":"Baron","full_name":"Baron, Elias"},{"full_name":"Feneberg, Martin","last_name":"Feneberg","first_name":"Martin"},{"first_name":"Rüdiger","full_name":"Goldhahn, Rüdiger","last_name":"Goldhahn"},{"last_name":"Deppe","full_name":"Deppe, Michael","first_name":"Michael"},{"first_name":"Fabian","full_name":"Tacken, Fabian","last_name":"Tacken"},{"orcid":"0000-0003-1121-3565","last_name":"As","id":"14","full_name":"As, Donat Josef","first_name":"Donat Josef"}],"date_created":"2021-09-07T09:19:46Z","date_updated":"2022-01-06T06:56:01Z","doi":"10.1088/1361-6463/abb97a","title":"Optical evidence of many-body effects in the zincblende Al$_\\mathrm{x}$Ga$_\\mathrm{1-x}$N alloy system","publication":"Journal of Physics D: Applied Physics","type":"journal_article","status":"public","department":[{"_id":"230"},{"_id":"429"}],"user_id":"14","_id":"23842","language":[{"iso":"eng"}],"article_number":"025101"},{"project":[{"_id":"53","name":"TRR 142"},{"_id":"54","name":"TRR 142 - Project Area A"},{"name":"TRR 142 - Subproject A6","_id":"63"},{"_id":"56","name":"TRR 142 - Project Area C"},{"_id":"75","name":"TRR 142 - Subproject C5"}],"_id":"20592","user_id":"30525","department":[{"_id":"230"},{"_id":"429"}],"article_type":"original","keyword":["epitaxial lift-off","GaAs/AlxGa1−xAs heterostructures","selective etching"],"language":[{"iso":"eng"}],"type":"journal_article","publication":"physica status solidi (a)","abstract":[{"lang":"eng","text":"GaAs-(111)-nanostructures exhibiting second harmonic generation are new building blocks in nonlinear optics. Such structures can be fabricated through epitaxial lift-off using selective etching of Al-containing layers and subsequent transfer to glass substrates. Herein, the selective etching of (111)B-oriented AlxGa1−xAs sacrificial layers (10–50 nm thick) with different aluminum concentrations (x = 0.5–1.0) in 10\\% hydrofluoric acid is investigated and compared with standard (100)-oriented structures. The thinner the sacrificial layer and the lower the aluminum content, the lower the lateral etch rate. For both orientations, the lateral etch rates are in the same order of magnitude, but some quantitative differences exist. Furthermore, the epitaxial lift-off, the transfer, and the nanopatterning of thin (111)B-oriented GaAs membranes are demonstrated. Atomic force microscopy and high-resolution X-ray diffraction measurements reveal the high structural quality of the transferred GaAs-(111) films."}],"status":"public","oa":"1","date_updated":"2022-01-06T06:54:30Z","author":[{"first_name":"Tobias","full_name":"Henksmeier, Tobias","last_name":"Henksmeier"},{"first_name":"Martin","full_name":"Eppinger, Martin","last_name":"Eppinger"},{"first_name":"Bernhard","last_name":"Reineke","full_name":"Reineke, Bernhard"},{"first_name":"Thomas","last_name":"Zentgraf","orcid":"0000-0002-8662-1101","id":"30525","full_name":"Zentgraf, Thomas"},{"last_name":"Meier","orcid":"https://orcid.org/0000-0002-3787-3572","full_name":"Meier, Cedrik","id":"20798","first_name":"Cedrik"},{"last_name":"Reuter","id":"37763","full_name":"Reuter, Dirk","first_name":"Dirk"}],"date_created":"2020-12-02T09:50:10Z","volume":218,"title":"Selective Etching of (111)B-Oriented AlxGa1−xAs-Layers for Epitaxial Lift-Off","main_file_link":[{"open_access":"1","url":"https://onlinelibrary.wiley.com/doi/full/10.1002/pssa.202000408"}],"doi":"https://doi.org/10.1002/pssa.202000408","publication_status":"published","issue":"3","year":"2021","citation":{"ama":"Henksmeier T, Eppinger M, Reineke B, Zentgraf T, Meier C, Reuter D. Selective Etching of (111)B-Oriented AlxGa1−xAs-Layers for Epitaxial Lift-Off. <i>physica status solidi (a)</i>. 2021;218(3):2000408. doi:<a href=\"https://doi.org/10.1002/pssa.202000408\">https://doi.org/10.1002/pssa.202000408</a>","chicago":"Henksmeier, Tobias, Martin Eppinger, Bernhard Reineke, Thomas Zentgraf, Cedrik Meier, and Dirk Reuter. “Selective Etching of (111)B-Oriented AlxGa1−xAs-Layers for Epitaxial Lift-Off.” <i>Physica Status Solidi (A)</i> 218, no. 3 (2021): 2000408. <a href=\"https://doi.org/10.1002/pssa.202000408\">https://doi.org/10.1002/pssa.202000408</a>.","ieee":"T. Henksmeier, M. Eppinger, B. Reineke, T. Zentgraf, C. Meier, and D. Reuter, “Selective Etching of (111)B-Oriented AlxGa1−xAs-Layers for Epitaxial Lift-Off,” <i>physica status solidi (a)</i>, vol. 218, no. 3, p. 2000408, 2021.","apa":"Henksmeier, T., Eppinger, M., Reineke, B., Zentgraf, T., Meier, C., &#38; Reuter, D. (2021). Selective Etching of (111)B-Oriented AlxGa1−xAs-Layers for Epitaxial Lift-Off. <i>Physica Status Solidi (A)</i>, <i>218</i>(3), 2000408. <a href=\"https://doi.org/10.1002/pssa.202000408\">https://doi.org/10.1002/pssa.202000408</a>","mla":"Henksmeier, Tobias, et al. “Selective Etching of (111)B-Oriented AlxGa1−xAs-Layers for Epitaxial Lift-Off.” <i>Physica Status Solidi (A)</i>, vol. 218, no. 3, 2021, p. 2000408, doi:<a href=\"https://doi.org/10.1002/pssa.202000408\">https://doi.org/10.1002/pssa.202000408</a>.","bibtex":"@article{Henksmeier_Eppinger_Reineke_Zentgraf_Meier_Reuter_2021, title={Selective Etching of (111)B-Oriented AlxGa1−xAs-Layers for Epitaxial Lift-Off}, volume={218}, DOI={<a href=\"https://doi.org/10.1002/pssa.202000408\">https://doi.org/10.1002/pssa.202000408</a>}, number={3}, journal={physica status solidi (a)}, author={Henksmeier, Tobias and Eppinger, Martin and Reineke, Bernhard and Zentgraf, Thomas and Meier, Cedrik and Reuter, Dirk}, year={2021}, pages={2000408} }","short":"T. Henksmeier, M. Eppinger, B. Reineke, T. Zentgraf, C. Meier, D. Reuter, Physica Status Solidi (A) 218 (2021) 2000408."},"page":"2000408","intvolume":"       218"},{"department":[{"_id":"15"},{"_id":"230"},{"_id":"429"}],"user_id":"20798","_id":"20900","project":[{"name":"TRR 142","_id":"53"},{"name":"TRR 142 - Project Area B","_id":"55"},{"_id":"66","name":"TRR 142 - Subproject B1"}],"language":[{"iso":"eng"}],"article_number":"126009","publication":"Journal of Crystal Growth","type":"journal_article","status":"public","volume":557,"date_created":"2021-01-12T13:52:31Z","author":[{"first_name":"M.","full_name":"Albert, M.","last_name":"Albert"},{"first_name":"C.","full_name":"Golla, C.","last_name":"Golla"},{"first_name":"Cedrik","last_name":"Meier","orcid":"https://orcid.org/0000-0002-3787-3572","full_name":"Meier, Cedrik","id":"20798"}],"date_updated":"2022-01-06T06:54:41Z","doi":"10.1016/j.jcrysgro.2020.126009","title":"Optical in-situ temperature management for high-quality ZnO molecular beam epitaxy","publication_identifier":{"issn":["0022-0248"]},"publication_status":"published","intvolume":"       557","citation":{"short":"M. Albert, C. Golla, C. Meier, Journal of Crystal Growth 557 (2021).","mla":"Albert, M., et al. “Optical In-Situ Temperature Management for High-Quality ZnO Molecular Beam Epitaxy.” <i>Journal of Crystal Growth</i>, vol. 557, 126009, 2021, doi:<a href=\"https://doi.org/10.1016/j.jcrysgro.2020.126009\">10.1016/j.jcrysgro.2020.126009</a>.","bibtex":"@article{Albert_Golla_Meier_2021, title={Optical in-situ temperature management for high-quality ZnO molecular beam epitaxy}, volume={557}, DOI={<a href=\"https://doi.org/10.1016/j.jcrysgro.2020.126009\">10.1016/j.jcrysgro.2020.126009</a>}, number={126009}, journal={Journal of Crystal Growth}, author={Albert, M. and Golla, C. and Meier, Cedrik}, year={2021} }","apa":"Albert, M., Golla, C., &#38; Meier, C. (2021). Optical in-situ temperature management for high-quality ZnO molecular beam epitaxy. <i>Journal of Crystal Growth</i>, <i>557</i>. <a href=\"https://doi.org/10.1016/j.jcrysgro.2020.126009\">https://doi.org/10.1016/j.jcrysgro.2020.126009</a>","ama":"Albert M, Golla C, Meier C. Optical in-situ temperature management for high-quality ZnO molecular beam epitaxy. <i>Journal of Crystal Growth</i>. 2021;557. doi:<a href=\"https://doi.org/10.1016/j.jcrysgro.2020.126009\">10.1016/j.jcrysgro.2020.126009</a>","ieee":"M. Albert, C. Golla, and C. Meier, “Optical in-situ temperature management for high-quality ZnO molecular beam epitaxy,” <i>Journal of Crystal Growth</i>, vol. 557, 2021.","chicago":"Albert, M., C. Golla, and Cedrik Meier. “Optical In-Situ Temperature Management for High-Quality ZnO Molecular Beam Epitaxy.” <i>Journal of Crystal Growth</i> 557 (2021). <a href=\"https://doi.org/10.1016/j.jcrysgro.2020.126009\">https://doi.org/10.1016/j.jcrysgro.2020.126009</a>."},"year":"2021"},{"language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"We realize and investigate a nonlinear metasurface taking advantage of intersubband transitions in ultranarrow GaN/AlN multi-quantum well heterostructures. Owing to huge band offsets, the structures offer resonant transitions in the telecom window around 1.55 µm. These heterostructures are functionalized with an array of plasmonic antennas featuring cross-polarized resonances at these near-infrared wavelengths and their second harmonic. This kind of nonlinear metasurface allows for substantial second-harmonic generation at normal incidence which is completely absent for an antenna array without the multi-quantum well structure underneath. While the second harmonic is originally radiated only into the plane of the quantum wells, a proper geometrical arrangement of the plasmonic elements permits the redirection of the second-harmonic light to free-space radiation, which is emitted perpendicular to the surface."}],"publication":"Optical Materials Express","title":"Nonlinear metasurface combining telecom-range intersubband transitions in GaN/AlN quantum wells with resonant plasmonic antenna arrays","publisher":"OSA","date_created":"2021-06-16T05:52:21Z","year":"2021","quality_controlled":"1","issue":"7","article_type":"original","article_number":"2134","project":[{"name":"TRR 142","_id":"53"},{"name":"TRR 142 - Project Area A","_id":"54"},{"name":"TRR 142 - Subproject A8","_id":"65"}],"_id":"22450","user_id":"30525","department":[{"_id":"15"},{"_id":"230"},{"_id":"289"},{"_id":"429"}],"status":"public","type":"journal_article","main_file_link":[{"url":"https://www.osapublishing.org/ome/fulltext.cfm?uri=ome-11-7-2134&id=452008","open_access":"1"}],"doi":"10.1364/ome.426236","oa":"1","date_updated":"2022-01-06T06:55:33Z","author":[{"first_name":"Jan","full_name":"Mundry, Jan","last_name":"Mundry"},{"last_name":"Spreyer","full_name":"Spreyer, Florian","first_name":"Florian"},{"first_name":"Valentin","full_name":"Jmerik, Valentin","last_name":"Jmerik"},{"full_name":"Ivanov, Sergey","last_name":"Ivanov","first_name":"Sergey"},{"id":"30525","full_name":"Zentgraf, Thomas","orcid":"0000-0002-8662-1101","last_name":"Zentgraf","first_name":"Thomas"},{"full_name":"Betz, Markus","last_name":"Betz","first_name":"Markus"}],"volume":11,"citation":{"apa":"Mundry, J., Spreyer, F., Jmerik, V., Ivanov, S., Zentgraf, T., &#38; Betz, M. (2021). Nonlinear metasurface combining telecom-range intersubband transitions in GaN/AlN quantum wells with resonant plasmonic antenna arrays. <i>Optical Materials Express</i>, <i>11</i>(7). <a href=\"https://doi.org/10.1364/ome.426236\">https://doi.org/10.1364/ome.426236</a>","mla":"Mundry, Jan, et al. “Nonlinear Metasurface Combining Telecom-Range Intersubband Transitions in GaN/AlN Quantum Wells with Resonant Plasmonic Antenna Arrays.” <i>Optical Materials Express</i>, vol. 11, no. 7, 2134, OSA, 2021, doi:<a href=\"https://doi.org/10.1364/ome.426236\">10.1364/ome.426236</a>.","bibtex":"@article{Mundry_Spreyer_Jmerik_Ivanov_Zentgraf_Betz_2021, title={Nonlinear metasurface combining telecom-range intersubband transitions in GaN/AlN quantum wells with resonant plasmonic antenna arrays}, volume={11}, DOI={<a href=\"https://doi.org/10.1364/ome.426236\">10.1364/ome.426236</a>}, number={72134}, journal={Optical Materials Express}, publisher={OSA}, author={Mundry, Jan and Spreyer, Florian and Jmerik, Valentin and Ivanov, Sergey and Zentgraf, Thomas and Betz, Markus}, year={2021} }","short":"J. Mundry, F. Spreyer, V. Jmerik, S. Ivanov, T. Zentgraf, M. Betz, Optical Materials Express 11 (2021).","ieee":"J. Mundry, F. Spreyer, V. Jmerik, S. Ivanov, T. Zentgraf, and M. Betz, “Nonlinear metasurface combining telecom-range intersubband transitions in GaN/AlN quantum wells with resonant plasmonic antenna arrays,” <i>Optical Materials Express</i>, vol. 11, no. 7, 2021.","chicago":"Mundry, Jan, Florian Spreyer, Valentin Jmerik, Sergey Ivanov, Thomas Zentgraf, and Markus Betz. “Nonlinear Metasurface Combining Telecom-Range Intersubband Transitions in GaN/AlN Quantum Wells with Resonant Plasmonic Antenna Arrays.” <i>Optical Materials Express</i> 11, no. 7 (2021). <a href=\"https://doi.org/10.1364/ome.426236\">https://doi.org/10.1364/ome.426236</a>.","ama":"Mundry J, Spreyer F, Jmerik V, Ivanov S, Zentgraf T, Betz M. Nonlinear metasurface combining telecom-range intersubband transitions in GaN/AlN quantum wells with resonant plasmonic antenna arrays. <i>Optical Materials Express</i>. 2021;11(7). doi:<a href=\"https://doi.org/10.1364/ome.426236\">10.1364/ome.426236</a>"},"intvolume":"        11","publication_status":"published","publication_identifier":{"issn":["2159-3930"]}},{"has_accepted_license":"1","publication_identifier":{"issn":["0740-3224","1520-8540"]},"publication_status":"published","page":"1717","intvolume":"        38","citation":{"ieee":"M. Hammer, L. Ebers, and J. Förstner, “Resonant evanescent excitation of guided waves with high-order optical angular momentum,” <i>Journal of the Optical Society of America B</i>, vol. 38, no. 5, p. 1717, 2021.","chicago":"Hammer, Manfred, Lena Ebers, and Jens Förstner. “Resonant Evanescent Excitation of Guided Waves with High-Order Optical Angular Momentum.” <i>Journal of the Optical Society of America B</i> 38, no. 5 (2021): 1717. <a href=\"https://doi.org/10.1364/josab.422731\">https://doi.org/10.1364/josab.422731</a>.","ama":"Hammer M, Ebers L, Förstner J. Resonant evanescent excitation of guided waves with high-order optical angular momentum. <i>Journal of the Optical Society of America B</i>. 2021;38(5):1717. doi:<a href=\"https://doi.org/10.1364/josab.422731\">10.1364/josab.422731</a>","mla":"Hammer, Manfred, et al. “Resonant Evanescent Excitation of Guided Waves with High-Order Optical Angular Momentum.” <i>Journal of the Optical Society of America B</i>, vol. 38, no. 5, 2021, p. 1717, doi:<a href=\"https://doi.org/10.1364/josab.422731\">10.1364/josab.422731</a>.","short":"M. Hammer, L. Ebers, J. Förstner, Journal of the Optical Society of America B 38 (2021) 1717.","bibtex":"@article{Hammer_Ebers_Förstner_2021, title={Resonant evanescent excitation of guided waves with high-order optical angular momentum}, volume={38}, DOI={<a href=\"https://doi.org/10.1364/josab.422731\">10.1364/josab.422731</a>}, number={5}, journal={Journal of the Optical Society of America B}, author={Hammer, Manfred and Ebers, Lena and Förstner, Jens}, year={2021}, pages={1717} }","apa":"Hammer, M., Ebers, L., &#38; Förstner, J. (2021). Resonant evanescent excitation of guided waves with high-order optical angular momentum. <i>Journal of the Optical Society of America B</i>, <i>38</i>(5), 1717. <a href=\"https://doi.org/10.1364/josab.422731\">https://doi.org/10.1364/josab.422731</a>"},"oa":"1","date_updated":"2022-01-06T06:55:20Z","volume":38,"author":[{"last_name":"Hammer","orcid":"0000-0002-6331-9348","id":"48077","full_name":"Hammer, Manfred","first_name":"Manfred"},{"last_name":"Ebers","id":"40428","full_name":"Ebers, Lena","first_name":"Lena"},{"full_name":"Förstner, Jens","id":"158","orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens"}],"doi":"10.1364/josab.422731","type":"journal_article","status":"public","_id":"21932","project":[{"name":"TRR 142 - Project Area C","_id":"56"},{"name":"TRR 142","_id":"53"},{"name":"TRR 142 - Subproject C5","_id":"75"}],"department":[{"_id":"61"},{"_id":"230"}],"user_id":"158","file_date_updated":"2021-04-30T11:59:16Z","issue":"5","year":"2021","date_created":"2021-04-30T11:54:03Z","title":"Resonant evanescent excitation of guided waves with high-order optical angular momentum","publication":"Journal of the Optical Society of America B","abstract":[{"text":"Gaussian-beam-like bundles of semi-guided waves propagating in a dielectric slab can excite modes with high-order optical angular momentum supported by a circular fiber. We consider a multimode step-index fiber with a high-index coating, where the waves in the slab are evanescently coupled to the modes of the fiber. Conditions for effective resonant interaction are identified. Based on a hybrid analytical–numerical coupled mode model, our simulations predict that substantial fractions of the input power can be focused into waves with specific orbital angular momentum, of excellent purity, with a clear distinction between degenerate modes with opposite vorticity.","lang":"eng"}],"file":[{"access_level":"open_access","file_id":"21933","file_name":"oamex.pdf","file_size":1963211,"date_created":"2021-04-30T11:57:14Z","creator":"fossie","date_updated":"2021-04-30T11:57:14Z","relation":"main_file","content_type":"application/pdf"},{"file_size":7750006,"access_level":"local","file_id":"21934","embargo":"2022-05-01","file_name":"2021-04 Hammer - JOSA B - Resonant evanescent excitation of guides waves with high-order angular momentum.pdf","date_updated":"2021-04-30T11:59:16Z","creator":"fossie","date_created":"2021-04-30T11:59:16Z","relation":"main_file","embargo_to":"open_access","content_type":"application/pdf"}],"keyword":["tet_topic_waveguides"],"ddc":["530"],"language":[{"iso":"eng"}]},{"publication_identifier":{"issn":["2578-7519"]},"has_accepted_license":"1","publication_status":"published","page":"3081","intvolume":"         4","citation":{"chicago":"Hammer, Manfred, Lena Ebers, and Jens Förstner. “Configurable Lossless Broadband Beam Splitters for Semi-Guided Waves in Integrated Silicon Photonics.” <i>OSA Continuum</i> 4, no. 12 (2021): 3081. <a href=\"https://doi.org/10.1364/osac.437549\">https://doi.org/10.1364/osac.437549</a>.","ieee":"M. Hammer, L. Ebers, and J. Förstner, “Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics,” <i>OSA Continuum</i>, vol. 4, no. 12, p. 3081, 2021, doi: <a href=\"https://doi.org/10.1364/osac.437549\">10.1364/osac.437549</a>.","ama":"Hammer M, Ebers L, Förstner J. Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics. <i>OSA Continuum</i>. 2021;4(12):3081. doi:<a href=\"https://doi.org/10.1364/osac.437549\">10.1364/osac.437549</a>","apa":"Hammer, M., Ebers, L., &#38; Förstner, J. (2021). Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics. <i>OSA Continuum</i>, <i>4</i>(12), 3081. <a href=\"https://doi.org/10.1364/osac.437549\">https://doi.org/10.1364/osac.437549</a>","short":"M. Hammer, L. Ebers, J. Förstner, OSA Continuum 4 (2021) 3081.","bibtex":"@article{Hammer_Ebers_Förstner_2021, title={Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics}, volume={4}, DOI={<a href=\"https://doi.org/10.1364/osac.437549\">10.1364/osac.437549</a>}, number={12}, journal={OSA Continuum}, author={Hammer, Manfred and Ebers, Lena and Förstner, Jens}, year={2021}, pages={3081} }","mla":"Hammer, Manfred, et al. “Configurable Lossless Broadband Beam Splitters for Semi-Guided Waves in Integrated Silicon Photonics.” <i>OSA Continuum</i>, vol. 4, no. 12, 2021, p. 3081, doi:<a href=\"https://doi.org/10.1364/osac.437549\">10.1364/osac.437549</a>."},"volume":4,"author":[{"first_name":"Manfred","orcid":"0000-0002-6331-9348","last_name":"Hammer","id":"48077","full_name":"Hammer, Manfred"},{"full_name":"Ebers, Lena","id":"40428","last_name":"Ebers","first_name":"Lena"},{"full_name":"Förstner, Jens","id":"158","last_name":"Förstner","orcid":"0000-0001-7059-9862","first_name":"Jens"}],"oa":"1","date_updated":"2022-11-18T09:58:03Z","doi":"10.1364/osac.437549","type":"journal_article","status":"public","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"user_id":"477","_id":"28196","project":[{"name":"TRR 142","_id":"53"},{"name":"TRR 142 - Project Area C","_id":"56"}],"file_date_updated":"2021-11-30T20:19:15Z","issue":"12","year":"2021","date_created":"2021-11-30T20:04:57Z","title":"Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics","publication":"OSA Continuum","file":[{"creator":"fossie","date_created":"2021-11-30T20:07:53Z","date_updated":"2021-11-30T20:19:15Z","file_name":"2021-11 Hammer - OSA Continuum - Trenches.pdf","file_id":"28197","access_level":"open_access","file_size":6618403,"content_type":"application/pdf","relation":"main_file"}],"abstract":[{"text":"We show that narrow trenches in a high-contrast silicon-photonics slab can act as lossless power dividers for semi-guided waves. Reflectance and transmittance can be easily configured by selecting the trench width. At sufficiently high angles of incidence, the devices are lossless, apart from material attenuation and scattering due to surface roughness. We numerically simulate a series of devices within the full 0-to-1-range of splitting ratios, for semi-guided plane wave incidence as well as for excitation by focused Gaussian wave bundles. Straightforward cascading of the trenches leads to concepts for 1×M-power dividers and a polarization beam splitter.","lang":"eng"}],"language":[{"iso":"eng"}],"keyword":["tet_topic_waveguide"],"ddc":["530"]},{"funded_apc":"1","user_id":"30525","department":[{"_id":"15"},{"_id":"230"},{"_id":"289"}],"project":[{"_id":"53","name":"TRR 142"},{"_id":"54","name":"TRR 142 - Project Area A"},{"name":"TRR 142 - Subproject A8","_id":"65"}],"_id":"26987","status":"public","type":"journal_article","main_file_link":[{"open_access":"1","url":"https://www.degruyter.com/document/doi/10.1515/nanoph-2021-0440/html"}],"doi":"10.1515/nanoph-2021-0440","author":[{"first_name":"Daniel","full_name":"Frese, Daniel","last_name":"Frese"},{"first_name":"Basudeb","last_name":"Sain","full_name":"Sain, Basudeb"},{"last_name":"Zhou","full_name":"Zhou, Hongqiang","first_name":"Hongqiang"},{"last_name":"Wang","full_name":"Wang, Yongtian","first_name":"Yongtian"},{"first_name":"Lingling","full_name":"Huang, Lingling","last_name":"Huang"},{"last_name":"Zentgraf","orcid":"0000-0002-8662-1101","id":"30525","full_name":"Zentgraf, Thomas","first_name":"Thomas"}],"volume":10,"oa":"1","date_updated":"2022-01-20T07:33:16Z","citation":{"apa":"Frese, D., Sain, B., Zhou, H., Wang, Y., Huang, L., &#38; Zentgraf, T. (2021). A wavelength and polarization selective photon sieve for holographic applications. <i>Nanophotonics</i>, <i>10</i>(18), 4543–4550. <a href=\"https://doi.org/10.1515/nanoph-2021-0440\">https://doi.org/10.1515/nanoph-2021-0440</a>","mla":"Frese, Daniel, et al. “A Wavelength and Polarization Selective Photon Sieve for Holographic Applications.” <i>Nanophotonics</i>, vol. 10, no. 18, De Gruyter, 2021, pp. 4543–50, doi:<a href=\"https://doi.org/10.1515/nanoph-2021-0440\">10.1515/nanoph-2021-0440</a>.","short":"D. Frese, B. Sain, H. Zhou, Y. Wang, L. Huang, T. Zentgraf, Nanophotonics 10 (2021) 4543–4550.","bibtex":"@article{Frese_Sain_Zhou_Wang_Huang_Zentgraf_2021, title={A wavelength and polarization selective photon sieve for holographic applications}, volume={10}, DOI={<a href=\"https://doi.org/10.1515/nanoph-2021-0440\">10.1515/nanoph-2021-0440</a>}, number={18}, journal={Nanophotonics}, publisher={De Gruyter}, author={Frese, Daniel and Sain, Basudeb and Zhou, Hongqiang and Wang, Yongtian and Huang, Lingling and Zentgraf, Thomas}, year={2021}, pages={4543–4550} }","ieee":"D. Frese, B. Sain, H. Zhou, Y. Wang, L. Huang, and T. Zentgraf, “A wavelength and polarization selective photon sieve for holographic applications,” <i>Nanophotonics</i>, vol. 10, no. 18, pp. 4543–4550, 2021, doi: <a href=\"https://doi.org/10.1515/nanoph-2021-0440\">10.1515/nanoph-2021-0440</a>.","chicago":"Frese, Daniel, Basudeb Sain, Hongqiang Zhou, Yongtian Wang, Lingling Huang, and Thomas Zentgraf. “A Wavelength and Polarization Selective Photon Sieve for Holographic Applications.” <i>Nanophotonics</i> 10, no. 18 (2021): 4543–50. <a href=\"https://doi.org/10.1515/nanoph-2021-0440\">https://doi.org/10.1515/nanoph-2021-0440</a>.","ama":"Frese D, Sain B, Zhou H, Wang Y, Huang L, Zentgraf T. A wavelength and polarization selective photon sieve for holographic applications. <i>Nanophotonics</i>. 2021;10(18):4543-4550. doi:<a href=\"https://doi.org/10.1515/nanoph-2021-0440\">10.1515/nanoph-2021-0440</a>"},"intvolume":"        10","page":"4543-4550","publication_status":"published","publication_identifier":{"issn":["2192-8614","2192-8606"]},"language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"Optical metasurfaces are perfect candidates for the phase and amplitude modulation of light, featuring an excellent basis for holographic applications. In this work, we present a dual amplitude holographic scheme based on the photon sieve principle, which is then combined with a phase hologram by utilizing the Pancharatnam–Berry phase. We demonstrate that two types of apertures, rectangular and square shapes in a gold film filled with silicon nanoantennas are sufficient to create two amplitude holograms at two different wavelengths in the visible, multiplexed with an additional phase-only hologram. The nanoantennas are tailored to adjust the spectral transmittance of the apertures, enabling the wavelength sensitivity. The phase-only hologram is implemented by utilizing the anisotropic rectangular structure. Interestingly, such three holograms have quantitative mathematical correlations with each other. Thus, the flexibility of polarization and wavelength channels can be utilized with custom-tailored features to achieve such amplitude and phase holography simultaneously without sacrificing any space-bandwidth product. The present scheme has the potential to store different pieces of information which can be displayed separately by switching the wavelength or the polarization state of the reading light beam."}],"publication":"Nanophotonics","title":"A wavelength and polarization selective photon sieve for holographic applications","date_created":"2021-10-28T07:15:52Z","publisher":"De Gruyter","year":"2021","issue":"18","quality_controlled":"1"},{"year":"2021","title":"Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides","date_created":"2021-09-03T08:04:06Z","abstract":[{"lang":"eng","text":"We demonstrate the integration of amorphous tungsten silicide superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides. We show proof-of-principle detection of evanescently coupled photons of 1550 nm wavelength using bidirectional waveguide coupling for two orthogonal polarization directions. We investigate the internal detection efficiency as well as detector absorption using coupling-independent characterization measurements. Furthermore, we describe strategies to improve the yield and efficiency of these devices."}],"file":[{"date_updated":"2021-09-07T07:41:04Z","creator":"fossie","date_created":"2021-09-07T07:41:04Z","file_size":1097820,"file_name":"2021-07 Höpker J._Phys._Photonics_3_034022.pdf","file_id":"23825","access_level":"open_access","content_type":"application/pdf","relation":"main_file"}],"publication":"Journal of Physics: Photonics","ddc":["530"],"language":[{"iso":"eng"}],"citation":{"ama":"Höpker JP, Verma VB, Protte M, et al. Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides. <i>Journal of Physics: Photonics</i>. 2021;3:034022. doi:<a href=\"https://doi.org/10.1088/2515-7647/ac105b\">10.1088/2515-7647/ac105b</a>","ieee":"J. P. Höpker <i>et al.</i>, “Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides,” <i>Journal of Physics: Photonics</i>, vol. 3, p. 034022, 2021, doi: <a href=\"https://doi.org/10.1088/2515-7647/ac105b\">10.1088/2515-7647/ac105b</a>.","chicago":"Höpker, Jan Philipp, Varun B Verma, Maximilian Protte, Raimund Ricken, Viktor Quiring, Christof Eigner, Lena Ebers, et al. “Integrated Superconducting Nanowire Single-Photon Detectors on Titanium in-Diffused Lithium Niobate Waveguides.” <i>Journal of Physics: Photonics</i> 3 (2021): 034022. <a href=\"https://doi.org/10.1088/2515-7647/ac105b\">https://doi.org/10.1088/2515-7647/ac105b</a>.","short":"J.P. Höpker, V.B. Verma, M. Protte, R. Ricken, V. Quiring, C. Eigner, L. Ebers, M. Hammer, J. Förstner, C. Silberhorn, R.P. Mirin, S. Woo Nam, T. Bartley, Journal of Physics: Photonics 3 (2021) 034022.","mla":"Höpker, Jan Philipp, et al. “Integrated Superconducting Nanowire Single-Photon Detectors on Titanium in-Diffused Lithium Niobate Waveguides.” <i>Journal of Physics: Photonics</i>, vol. 3, 2021, p. 034022, doi:<a href=\"https://doi.org/10.1088/2515-7647/ac105b\">10.1088/2515-7647/ac105b</a>.","bibtex":"@article{Höpker_Verma_Protte_Ricken_Quiring_Eigner_Ebers_Hammer_Förstner_Silberhorn_et al._2021, title={Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides}, volume={3}, DOI={<a href=\"https://doi.org/10.1088/2515-7647/ac105b\">10.1088/2515-7647/ac105b</a>}, journal={Journal of Physics: Photonics}, author={Höpker, Jan Philipp and Verma, Varun B and Protte, Maximilian and Ricken, Raimund and Quiring, Viktor and Eigner, Christof and Ebers, Lena and Hammer, Manfred and Förstner, Jens and Silberhorn, Christine and et al.}, year={2021}, pages={034022} }","apa":"Höpker, J. P., Verma, V. B., Protte, M., Ricken, R., Quiring, V., Eigner, C., Ebers, L., Hammer, M., Förstner, J., Silberhorn, C., Mirin, R. P., Woo Nam, S., &#38; Bartley, T. (2021). Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides. <i>Journal of Physics: Photonics</i>, <i>3</i>, 034022. <a href=\"https://doi.org/10.1088/2515-7647/ac105b\">https://doi.org/10.1088/2515-7647/ac105b</a>"},"intvolume":"         3","page":"034022","publication_status":"published","has_accepted_license":"1","publication_identifier":{"issn":["2515-7647"]},"doi":"10.1088/2515-7647/ac105b","oa":"1","date_updated":"2022-10-25T07:34:42Z","author":[{"last_name":"Höpker","id":"33913","full_name":"Höpker, Jan Philipp","first_name":"Jan Philipp"},{"last_name":"Verma","full_name":"Verma, Varun B","first_name":"Varun B"},{"full_name":"Protte, Maximilian","id":"46170","last_name":"Protte","first_name":"Maximilian"},{"full_name":"Ricken, Raimund","last_name":"Ricken","first_name":"Raimund"},{"first_name":"Viktor","full_name":"Quiring, Viktor","last_name":"Quiring"},{"last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","id":"13244","full_name":"Eigner, Christof","first_name":"Christof"},{"last_name":"Ebers","full_name":"Ebers, Lena","id":"40428","first_name":"Lena"},{"orcid":"0000-0002-6331-9348","last_name":"Hammer","id":"48077","full_name":"Hammer, Manfred","first_name":"Manfred"},{"id":"158","full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens"},{"first_name":"Christine","id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn"},{"full_name":"Mirin, Richard P","last_name":"Mirin","first_name":"Richard P"},{"first_name":"Sae","last_name":"Woo Nam","full_name":"Woo Nam, Sae"},{"first_name":"Tim","last_name":"Bartley","id":"49683","full_name":"Bartley, Tim"}],"volume":3,"status":"public","type":"journal_article","article_type":"original","file_date_updated":"2021-09-07T07:41:04Z","project":[{"_id":"53","name":"TRR 142"}],"_id":"23728","user_id":"49683","department":[{"_id":"15"},{"_id":"61"},{"_id":"230"}]},{"citation":{"mla":"Hajlaoui, Mahdi, et al. “Extremely Low-Energy ARPES of Quantum Well States in Cubic-GaN/AlN and GaAs/AlGaAs Heterostructures.” <i>Scientific Reports</i>, vol. 11, 19081, 2021, doi:<a href=\"https://doi.org/10.1038/s41598-021-98569-6\">10.1038/s41598-021-98569-6</a>.","short":"M. Hajlaoui, S. Ponzoni, M. Deppe, T. Henksmeier, D.J. As, D. Reuter, T. Zentgraf, G. Springholz, C.M. Schneider, S. Cramm, M. Cinchetti, Scientific Reports 11 (2021).","bibtex":"@article{Hajlaoui_Ponzoni_Deppe_Henksmeier_As_Reuter_Zentgraf_Springholz_Schneider_Cramm_et al._2021, title={Extremely low-energy ARPES of quantum well states in cubic-GaN/AlN and GaAs/AlGaAs heterostructures}, volume={11}, DOI={<a href=\"https://doi.org/10.1038/s41598-021-98569-6\">10.1038/s41598-021-98569-6</a>}, number={19081}, journal={Scientific Reports}, author={Hajlaoui, Mahdi and Ponzoni, Stefano and Deppe, Michael and Henksmeier, Tobias and As, Donat Josef and Reuter, Dirk and Zentgraf, Thomas and Springholz, Gunther and Schneider, Claus Michael and Cramm, Stefan and et al.}, year={2021} }","apa":"Hajlaoui, M., Ponzoni, S., Deppe, M., Henksmeier, T., As, D. J., Reuter, D., Zentgraf, T., Springholz, G., Schneider, C. M., Cramm, S., &#38; Cinchetti, M. (2021). Extremely low-energy ARPES of quantum well states in cubic-GaN/AlN and GaAs/AlGaAs heterostructures. <i>Scientific Reports</i>, <i>11</i>, Article 19081. <a href=\"https://doi.org/10.1038/s41598-021-98569-6\">https://doi.org/10.1038/s41598-021-98569-6</a>","ieee":"M. Hajlaoui <i>et al.</i>, “Extremely low-energy ARPES of quantum well states in cubic-GaN/AlN and GaAs/AlGaAs heterostructures,” <i>Scientific Reports</i>, vol. 11, Art. no. 19081, 2021, doi: <a href=\"https://doi.org/10.1038/s41598-021-98569-6\">10.1038/s41598-021-98569-6</a>.","chicago":"Hajlaoui, Mahdi, Stefano Ponzoni, Michael Deppe, Tobias Henksmeier, Donat Josef As, Dirk Reuter, Thomas Zentgraf, et al. “Extremely Low-Energy ARPES of Quantum Well States in Cubic-GaN/AlN and GaAs/AlGaAs Heterostructures.” <i>Scientific Reports</i> 11 (2021). <a href=\"https://doi.org/10.1038/s41598-021-98569-6\">https://doi.org/10.1038/s41598-021-98569-6</a>.","ama":"Hajlaoui M, Ponzoni S, Deppe M, et al. Extremely low-energy ARPES of quantum well states in cubic-GaN/AlN and GaAs/AlGaAs heterostructures. <i>Scientific Reports</i>. 2021;11. doi:<a href=\"https://doi.org/10.1038/s41598-021-98569-6\">10.1038/s41598-021-98569-6</a>"},"intvolume":"        11","publication_status":"published","publication_identifier":{"issn":["2045-2322"]},"main_file_link":[{"url":"https://www.nature.com/articles/s41598-021-98569-6","open_access":"1"}],"doi":"10.1038/s41598-021-98569-6","date_updated":"2023-10-09T09:15:12Z","oa":"1","author":[{"first_name":"Mahdi","full_name":"Hajlaoui, Mahdi","last_name":"Hajlaoui"},{"last_name":"Ponzoni","full_name":"Ponzoni, Stefano","first_name":"Stefano"},{"full_name":"Deppe, Michael","last_name":"Deppe","first_name":"Michael"},{"first_name":"Tobias","full_name":"Henksmeier, Tobias","last_name":"Henksmeier"},{"id":"14","full_name":"As, Donat Josef","last_name":"As","orcid":"0000-0003-1121-3565","first_name":"Donat Josef"},{"first_name":"Dirk","last_name":"Reuter","id":"37763","full_name":"Reuter, Dirk"},{"first_name":"Thomas","full_name":"Zentgraf, Thomas","id":"30525","orcid":"0000-0002-8662-1101","last_name":"Zentgraf"},{"last_name":"Springholz","full_name":"Springholz, Gunther","first_name":"Gunther"},{"first_name":"Claus Michael","last_name":"Schneider","full_name":"Schneider, Claus Michael"},{"first_name":"Stefan","full_name":"Cramm, Stefan","last_name":"Cramm"},{"full_name":"Cinchetti, Mirko","last_name":"Cinchetti","first_name":"Mirko"}],"volume":11,"status":"public","type":"journal_article","article_number":"19081","article_type":"original","project":[{"_id":"53","name":"TRR 142","grant_number":"231447078"},{"_id":"54","name":"TRR 142 - Project Area A"},{"_id":"65","name":"TRR 142 - Subproject A8","grant_number":"231447078"},{"_id":"55","name":"TRR 142 - Project Area B"},{"_id":"67","name":"TRR 142 - Subproject B2"},{"grant_number":"231447078","_id":"63","name":"TRR 142 - Subproject A6"}],"_id":"25227","user_id":"14931","department":[{"_id":"15"},{"_id":"230"},{"_id":"289"}],"year":"2021","quality_controlled":"1","title":"Extremely low-energy ARPES of quantum well states in cubic-GaN/AlN and GaAs/AlGaAs heterostructures","date_created":"2021-10-01T07:29:15Z","abstract":[{"lang":"eng","text":"<jats:title>Abstract</jats:title><jats:p>Quantum well (QW) heterostructures have been extensively used for the realization of a wide range of optical and electronic devices. Exploiting their potential for further improvement and development requires a fundamental understanding of their electronic structure. So far, the most commonly used experimental techniques for this purpose have been all-optical spectroscopy methods that, however, are generally averaging in momentum space. Additional information can be gained by angle-resolved photoelectron spectroscopy (ARPES), which measures the electronic structure with momentum resolution. Here we report on the use of extremely low-energy ARPES (photon energy ~ 7 eV) to increase depth sensitivity and access buried QW states, located at 3 nm and 6 nm below the surface of cubic-GaN/AlN and GaAs/AlGaAs heterostructures, respectively. We find that the QW states in cubic-GaN/AlN can indeed be observed, but not their energy dispersion, because of the high surface roughness. The GaAs/AlGaAs QW states, on the other hand, are buried too deep to be detected by extremely low-energy ARPES. Since the sample surface is much flatter, the ARPES spectra of the GaAs/AlGaAs show distinct features in momentum space, which can be reconducted to the band structure of the topmost surface layer of the QW structure. Our results provide important information about the samples’ properties required to perform extremely low-energy ARPES experiments on electronic states buried in semiconductor heterostructures.</jats:p>"}],"publication":"Scientific Reports","language":[{"iso":"eng"}]}]