[{"volume":132,"date_created":"2024-06-24T09:39:42Z","author":[{"first_name":"Marvin","id":"52309","full_name":"Krenz, Marvin","last_name":"Krenz"},{"first_name":"Uwe","last_name":"Gerstmann","orcid":"0000-0002-4476-223X","full_name":"Gerstmann, Uwe","id":"171"},{"first_name":"Wolf Gero","id":"468","full_name":"Schmidt, Wolf Gero","orcid":"0000-0002-2717-5076","last_name":"Schmidt"}],"publisher":"American Physical Society (APS)","date_updated":"2025-12-05T13:38:22Z","doi":"10.1103/physrevlett.132.076201","title":"Defect-Assisted Exciton Transfer across the Tetracene-Si(111):H Interface","issue":"7","publication_identifier":{"issn":["0031-9007","1079-7114"]},"publication_status":"published","intvolume":" 132","citation":{"apa":"Krenz, M., Gerstmann, U., & Schmidt, W. G. (2024). Defect-Assisted Exciton Transfer across the Tetracene-Si(111):H Interface. Physical Review Letters, 132(7), Article 076201. https://doi.org/10.1103/physrevlett.132.076201","mla":"Krenz, Marvin, et al. “Defect-Assisted Exciton Transfer across the Tetracene-Si(111):H Interface.” Physical Review Letters, vol. 132, no. 7, 076201, American Physical Society (APS), 2024, doi:10.1103/physrevlett.132.076201.","bibtex":"@article{Krenz_Gerstmann_Schmidt_2024, title={Defect-Assisted Exciton Transfer across the Tetracene-Si(111):H Interface}, volume={132}, DOI={10.1103/physrevlett.132.076201}, number={7076201}, journal={Physical Review Letters}, publisher={American Physical Society (APS)}, author={Krenz, Marvin and Gerstmann, Uwe and Schmidt, Wolf Gero}, year={2024} }","short":"M. Krenz, U. Gerstmann, W.G. Schmidt, Physical Review Letters 132 (2024).","ieee":"M. Krenz, U. Gerstmann, and W. G. Schmidt, “Defect-Assisted Exciton Transfer across the Tetracene-Si(111):H Interface,” Physical Review Letters, vol. 132, no. 7, Art. no. 076201, 2024, doi: 10.1103/physrevlett.132.076201.","chicago":"Krenz, Marvin, Uwe Gerstmann, and Wolf Gero Schmidt. “Defect-Assisted Exciton Transfer across the Tetracene-Si(111):H Interface.” Physical Review Letters 132, no. 7 (2024). https://doi.org/10.1103/physrevlett.132.076201.","ama":"Krenz M, Gerstmann U, Schmidt WG. Defect-Assisted Exciton Transfer across the Tetracene-Si(111):H Interface. Physical Review Letters. 2024;132(7). doi:10.1103/physrevlett.132.076201"},"year":"2024","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"790"},{"_id":"429"},{"_id":"27"},{"_id":"230"},{"_id":"35"}],"user_id":"16199","_id":"54865","project":[{"_id":"53","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"},{"_id":"54","name":"TRR 142 - A: TRR 142 - Project Area A"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"name":"TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)","_id":"168"},{"name":"TRR 142 - A11: TRR 142 - Subproject A11","_id":"166"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"language":[{"iso":"eng"}],"article_number":"076201","publication":"Physical Review Letters","type":"journal_article","status":"public"},{"author":[{"first_name":"Sergej","last_name":"Neufeld","full_name":"Neufeld, Sergej"},{"first_name":"Uwe","id":"171","full_name":"Gerstmann, Uwe","orcid":"0000-0002-4476-223X","last_name":"Gerstmann"},{"first_name":"Laura","last_name":"Padberg","full_name":"Padberg, Laura","id":"40300"},{"id":"13244","full_name":"Eigner, Christof","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","first_name":"Christof"},{"first_name":"Gerhard","last_name":"Berth","full_name":"Berth, Gerhard","id":"53"},{"first_name":"Christine","last_name":"Silberhorn","id":"26263","full_name":"Silberhorn, Christine"},{"last_name":"Eng","full_name":"Eng, Lukas M.","first_name":"Lukas M."},{"id":"468","full_name":"Schmidt, Wolf Gero","last_name":"Schmidt","orcid":"0000-0002-2717-5076","first_name":"Wolf Gero"},{"first_name":"Michael","id":"22501","full_name":"Rüsing, Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577"}],"volume":13,"oa":"1","date_updated":"2023-10-11T09:15:58Z","main_file_link":[{"open_access":"1","url":"https://doi.org/10.3390/cryst13101423"}],"doi":"10.3390/cryst13101423","publication_status":"published","publication_identifier":{"issn":["2073-4352"]},"citation":{"ieee":"S. Neufeld et al., “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family,” Crystals, vol. 13, no. 10, Art. no. 1423, 2023, doi: 10.3390/cryst13101423.","chicago":"Neufeld, Sergej, Uwe Gerstmann, Laura Padberg, Christof Eigner, Gerhard Berth, Christine Silberhorn, Lukas M. Eng, Wolf Gero Schmidt, and Michael Rüsing. “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” Crystals 13, no. 10 (2023). https://doi.org/10.3390/cryst13101423.","ama":"Neufeld S, Gerstmann U, Padberg L, et al. Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family. Crystals. 2023;13(10). doi:10.3390/cryst13101423","bibtex":"@article{Neufeld_Gerstmann_Padberg_Eigner_Berth_Silberhorn_Eng_Schmidt_Rüsing_2023, title={Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family}, volume={13}, DOI={10.3390/cryst13101423}, number={101423}, journal={Crystals}, publisher={MDPI AG}, author={Neufeld, Sergej and Gerstmann, Uwe and Padberg, Laura and Eigner, Christof and Berth, Gerhard and Silberhorn, Christine and Eng, Lukas M. and Schmidt, Wolf Gero and Rüsing, Michael}, year={2023} }","mla":"Neufeld, Sergej, et al. “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” Crystals, vol. 13, no. 10, 1423, MDPI AG, 2023, doi:10.3390/cryst13101423.","short":"S. Neufeld, U. Gerstmann, L. Padberg, C. Eigner, G. Berth, C. Silberhorn, L.M. Eng, W.G. Schmidt, M. Rüsing, Crystals 13 (2023).","apa":"Neufeld, S., Gerstmann, U., Padberg, L., Eigner, C., Berth, G., Silberhorn, C., Eng, L. M., Schmidt, W. G., & Rüsing, M. (2023). Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family. Crystals, 13(10), Article 1423. https://doi.org/10.3390/cryst13101423"},"intvolume":" 13","user_id":"22501","department":[{"_id":"169"}],"project":[{"_id":"168","name":"TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)","grant_number":"231447078"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","_id":"266","grant_number":"PROFILNRW-2020-067"}],"_id":"47997","funded_apc":"1","article_number":"1423","type":"journal_article","status":"public","date_created":"2023-10-11T09:10:53Z","publisher":"MDPI AG","title":"Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family","issue":"10","quality_controlled":"1","year":"2023","language":[{"iso":"eng"}],"keyword":["Inorganic Chemistry","Condensed Matter Physics","General Materials Science","General Chemical Engineering"],"publication":"Crystals","abstract":[{"text":"The crystal family of potassium titanyl phosphate (KTiOPO4) is a promising material group for applications in quantum and nonlinear optics. The fabrication of low-loss optical waveguides, as well as high-grade periodically poled ferroelectric domain structures, requires a profound understanding of the material properties and crystal structure. In this regard, Raman spectroscopy offers the possibility to study and visualize domain structures, strain, defects, and the local stoichiometry, which are all factors impacting device performance. However, the accurate interpretation of Raman spectra and their changes with respect to extrinsic and intrinsic defects requires a thorough assignment of the Raman modes to their respective crystal features, which to date is only partly conducted based on phenomenological modelling. To address this issue, we calculated the phonon spectra of potassium titanyl phosphate and the related compounds rubidium titanyl phosphate (RbTiOPO4) and potassium titanyl arsenate (KTiOAsO4) based on density functional theory and compared them with experimental data. Overall, this allows us to assign various spectral features to eigenmodes of lattice substructures with improved detail compared to previous assignments. Nevertheless, the analysis also shows that not all features of the spectra can unambigiously be explained yet. A possible explanation might be that defects or long range fields not included in the modeling play a crucial rule for the resulting Raman spectrum. In conclusion, this work provides an improved foundation into the vibrational properties in the KTiOPO4 material family.","lang":"eng"}]},{"citation":{"ama":"Neufeld S, Gerstmann U, Padberg L, et al. Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family. Crystals. 2023;13(10). doi:10.3390/cryst13101423","chicago":"Neufeld, Sergej, Uwe Gerstmann, Laura Padberg, Christof Eigner, Gerhard Berth, Christine Silberhorn, Lukas M. Eng, Wolf Gero Schmidt, and Michael Rüsing. “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” Crystals 13, no. 10 (2023). https://doi.org/10.3390/cryst13101423.","ieee":"S. Neufeld et al., “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family,” Crystals, vol. 13, no. 10, Art. no. 1423, 2023, doi: 10.3390/cryst13101423.","short":"S. Neufeld, U. Gerstmann, L. Padberg, C. Eigner, G. Berth, C. Silberhorn, L.M. Eng, W.G. Schmidt, M. Rüsing, Crystals 13 (2023).","mla":"Neufeld, Sergej, et al. “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” Crystals, vol. 13, no. 10, 1423, MDPI AG, 2023, doi:10.3390/cryst13101423.","bibtex":"@article{Neufeld_Gerstmann_Padberg_Eigner_Berth_Silberhorn_Eng_Schmidt_Rüsing_2023, title={Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family}, volume={13}, DOI={10.3390/cryst13101423}, number={101423}, journal={Crystals}, publisher={MDPI AG}, author={Neufeld, Sergej and Gerstmann, Uwe and Padberg, Laura and Eigner, Christof and Berth, Gerhard and Silberhorn, Christine and Eng, Lukas M. and Schmidt, Wolf Gero and Rüsing, Michael}, year={2023} }","apa":"Neufeld, S., Gerstmann, U., Padberg, L., Eigner, C., Berth, G., Silberhorn, C., Eng, L. M., Schmidt, W. G., & Rüsing, M. (2023). Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family. Crystals, 13(10), Article 1423. https://doi.org/10.3390/cryst13101423"},"intvolume":" 13","year":"2023","issue":"10","publication_status":"published","publication_identifier":{"issn":["2073-4352"]},"doi":"10.3390/cryst13101423","title":"Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family","date_created":"2024-06-24T06:15:00Z","author":[{"full_name":"Neufeld, Sergej","last_name":"Neufeld","first_name":"Sergej"},{"first_name":"Uwe","orcid":"0000-0002-4476-223X","last_name":"Gerstmann","full_name":"Gerstmann, Uwe","id":"171"},{"id":"40300","full_name":"Padberg, Laura","last_name":"Padberg","first_name":"Laura"},{"first_name":"Christof","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","id":"13244","full_name":"Eigner, Christof"},{"first_name":"Gerhard","last_name":"Berth","id":"53","full_name":"Berth, Gerhard"},{"first_name":"Christine","id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."},{"full_name":"Schmidt, Wolf Gero","id":"468","last_name":"Schmidt","orcid":"0000-0002-2717-5076","first_name":"Wolf Gero"},{"first_name":"Michael","id":"22501","full_name":"Rüsing, Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577"}],"volume":13,"date_updated":"2024-06-24T06:30:23Z","publisher":"MDPI AG","status":"public","abstract":[{"text":"The crystal family of potassium titanyl phosphate (KTiOPO4) is a promising material group for applications in quantum and nonlinear optics. The fabrication of low-loss optical waveguides, as well as high-grade periodically poled ferroelectric domain structures, requires a profound understanding of the material properties and crystal structure. In this regard, Raman spectroscopy offers the possibility to study and visualize domain structures, strain, defects, and the local stoichiometry, which are all factors impacting device performance. However, the accurate interpretation of Raman spectra and their changes with respect to extrinsic and intrinsic defects requires a thorough assignment of the Raman modes to their respective crystal features, which to date is only partly conducted based on phenomenological modelling. To address this issue, we calculated the phonon spectra of potassium titanyl phosphate and the related compounds rubidium titanyl phosphate (RbTiOPO4) and potassium titanyl arsenate (KTiOAsO4) based on density functional theory and compared them with experimental data. Overall, this allows us to assign various spectral features to eigenmodes of lattice substructures with improved detail compared to previous assignments. Nevertheless, the analysis also shows that not all features of the spectra can unambigiously be explained yet. A possible explanation might be that defects or long range fields not included in the modeling play a crucial rule for the resulting Raman spectrum. In conclusion, this work provides an improved foundation into the vibrational properties in the KTiOPO4 material family.","lang":"eng"}],"type":"journal_article","publication":"Crystals","language":[{"iso":"eng"}],"article_number":"1423","user_id":"16199","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"288"},{"_id":"230"},{"_id":"429"}],"project":[{"grant_number":"231447078","_id":"53","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"}],"_id":"54852"},{"publication":"Crystals","type":"journal_article","abstract":[{"text":"Batteries based on heavier alkali ions are considered promising candidates to substitute for current Li-based technologies. In this theoretical study, we characterize the structural properties of a novel material, i.e., F-doped RbTiOPO4 (RbTiPO4F, RTP:F), and discuss aspects of its electrochemical performance in Rb-ion batteries (RIBs) using density functional theory (DFT). According to our calculations, RTP:F is expected to retain the so-called KTiOPO4 (KTP)-type structure, with lattice parameters of 13.236 Å, 6.616 Å, and 10.945 Å. Due to the doping with F, the crystal features eight extra electrons per unit cell, whereby each of these electrons is trapped by one of the surrounding Ti atoms in the cell. Notably, the ground state of the system corresponds to a ferromagnetic spin configuration (i.e., S=4). The deintercalation of Rb leads to the oxidation of the Ti atoms in the cell (i.e., from Ti3+ to Ti4+) and to reduced magnetic moments. The material promises interesting electrochemical properties for the cathode: rather high average voltages above 2.8 V and modest volume shrinkages below 13% even in the fully deintercalated case are predicted.","lang":"eng"}],"status":"public","_id":"54854","project":[{"grant_number":"231447078","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"_id":"166","name":"TRR 142 - A11: TRR 142 - Subproject A11"},{"name":"TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)","_id":"168","grant_number":"231447078"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"790"},{"_id":"230"},{"_id":"429"},{"_id":"27"}],"user_id":"16199","article_number":"5","language":[{"iso":"eng"}],"publication_identifier":{"issn":["2073-4352"]},"publication_status":"published","issue":"1","year":"2023","intvolume":" 14","citation":{"chicago":"Bocchini, Adriana, Yingjie Xie, Wolf Gero Schmidt, and Uwe Gerstmann. “Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles.” Crystals 14, no. 1 (2023). https://doi.org/10.3390/cryst14010005.","ieee":"A. Bocchini, Y. Xie, W. G. Schmidt, and U. Gerstmann, “Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles,” Crystals, vol. 14, no. 1, Art. no. 5, 2023, doi: 10.3390/cryst14010005.","ama":"Bocchini A, Xie Y, Schmidt WG, Gerstmann U. Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles. Crystals. 2023;14(1). doi:10.3390/cryst14010005","apa":"Bocchini, A., Xie, Y., Schmidt, W. G., & Gerstmann, U. (2023). Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles. Crystals, 14(1), Article 5. https://doi.org/10.3390/cryst14010005","bibtex":"@article{Bocchini_Xie_Schmidt_Gerstmann_2023, title={Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles}, volume={14}, DOI={10.3390/cryst14010005}, number={15}, journal={Crystals}, publisher={MDPI AG}, author={Bocchini, Adriana and Xie, Yingjie and Schmidt, Wolf Gero and Gerstmann, Uwe}, year={2023} }","short":"A. Bocchini, Y. Xie, W.G. Schmidt, U. Gerstmann, Crystals 14 (2023).","mla":"Bocchini, Adriana, et al. “Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles.” Crystals, vol. 14, no. 1, 5, MDPI AG, 2023, doi:10.3390/cryst14010005."},"publisher":"MDPI AG","date_updated":"2024-06-24T06:30:13Z","volume":14,"date_created":"2024-06-24T06:21:04Z","author":[{"first_name":"Adriana","orcid":"0000-0002-2134-3075","last_name":"Bocchini","id":"58349","full_name":"Bocchini, Adriana"},{"last_name":"Xie","full_name":"Xie, Yingjie","first_name":"Yingjie"},{"first_name":"Wolf Gero","last_name":"Schmidt","orcid":"0000-0002-2717-5076","full_name":"Schmidt, Wolf Gero","id":"468"},{"first_name":"Uwe","last_name":"Gerstmann","orcid":"0000-0002-4476-223X","id":"171","full_name":"Gerstmann, Uwe"}],"title":"Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles","doi":"10.3390/cryst14010005"},{"date_created":"2024-06-24T06:18:17Z","publisher":"AIP Publishing","title":"14N Hyperfine and nuclear interactions of axial and basal NV centers in 4H-SiC: A high frequency (94 GHz) ENDOR study","issue":"12","year":"2023","language":[{"iso":"eng"}],"publication":"Journal of Applied Physics","abstract":[{"text":"The nitrogen-vacancy (NV) centers (NCVSi)− in 4H silicon carbide (SiC) constitute an ensemble of spin S = 1 solid state qubits interacting with the surrounding 14N and 29Si nuclei. As quantum applications based on a polarization transfer from the electron spin to the nuclei require the knowledge of the electron–nuclear interaction parameters, we have used high-frequency (94 GHz) electron–nuclear double resonance spectroscopy combined with first-principles density functional theory to investigate the hyperfine and nuclear quadrupole interactions of the basal and axial NV centers. We observed that the four inequivalent NV configurations (hk, kh, hh, and kk) exhibit different electron–nuclear interaction parameters, suggesting that each NV center may act as a separate optically addressable qubit. Finally, we rationalized the observed differences in terms of distinctions in the local atomic structures of the NV configurations. Thus, our results provide the basic knowledge for an extension of quantum protocols involving the 14N nuclear spin.","lang":"eng"}],"volume":134,"author":[{"first_name":"F. F.","full_name":"Murzakhanov, F. F.","last_name":"Murzakhanov"},{"full_name":"Sadovnikova, M. A.","last_name":"Sadovnikova","first_name":"M. A."},{"first_name":"G. V.","full_name":"Mamin, G. V.","last_name":"Mamin"},{"last_name":"Nagalyuk","full_name":"Nagalyuk, S. S.","first_name":"S. S."},{"last_name":"von Bardeleben","full_name":"von Bardeleben, H. J.","first_name":"H. J."},{"last_name":"Schmidt","orcid":"0000-0002-2717-5076","id":"468","full_name":"Schmidt, Wolf Gero","first_name":"Wolf Gero"},{"id":"65612","full_name":"Biktagirov, Timur","last_name":"Biktagirov","first_name":"Timur"},{"orcid":"0000-0002-4476-223X","last_name":"Gerstmann","id":"171","full_name":"Gerstmann, Uwe","first_name":"Uwe"},{"first_name":"V. A.","full_name":"Soltamov, V. A.","last_name":"Soltamov"}],"date_updated":"2024-06-24T06:30:19Z","doi":"10.1063/5.0170099","publication_identifier":{"issn":["0021-8979","1089-7550"]},"publication_status":"published","intvolume":" 134","citation":{"ama":"Murzakhanov FF, Sadovnikova MA, Mamin GV, et al. 14N Hyperfine and nuclear interactions of axial and basal NV centers in 4H-SiC: A high frequency (94 GHz) ENDOR study. Journal of Applied Physics. 2023;134(12). doi:10.1063/5.0170099","ieee":"F. F. Murzakhanov et al., “14N Hyperfine and nuclear interactions of axial and basal NV centers in 4H-SiC: A high frequency (94 GHz) ENDOR study,” Journal of Applied Physics, vol. 134, no. 12, 2023, doi: 10.1063/5.0170099.","chicago":"Murzakhanov, F. F., M. A. Sadovnikova, G. V. Mamin, S. S. Nagalyuk, H. J. von Bardeleben, Wolf Gero Schmidt, Timur Biktagirov, Uwe Gerstmann, and V. A. Soltamov. “14N Hyperfine and Nuclear Interactions of Axial and Basal NV Centers in 4H-SiC: A High Frequency (94 GHz) ENDOR Study.” Journal of Applied Physics 134, no. 12 (2023). https://doi.org/10.1063/5.0170099.","bibtex":"@article{Murzakhanov_Sadovnikova_Mamin_Nagalyuk_von Bardeleben_Schmidt_Biktagirov_Gerstmann_Soltamov_2023, title={14N Hyperfine and nuclear interactions of axial and basal NV centers in 4H-SiC: A high frequency (94 GHz) ENDOR study}, volume={134}, DOI={10.1063/5.0170099}, number={12}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Murzakhanov, F. F. and Sadovnikova, M. A. and Mamin, G. V. and Nagalyuk, S. S. and von Bardeleben, H. J. and Schmidt, Wolf Gero and Biktagirov, Timur and Gerstmann, Uwe and Soltamov, V. A.}, year={2023} }","mla":"Murzakhanov, F. F., et al. “14N Hyperfine and Nuclear Interactions of Axial and Basal NV Centers in 4H-SiC: A High Frequency (94 GHz) ENDOR Study.” Journal of Applied Physics, vol. 134, no. 12, AIP Publishing, 2023, doi:10.1063/5.0170099.","short":"F.F. Murzakhanov, M.A. Sadovnikova, G.V. Mamin, S.S. Nagalyuk, H.J. von Bardeleben, W.G. Schmidt, T. Biktagirov, U. Gerstmann, V.A. Soltamov, Journal of Applied Physics 134 (2023).","apa":"Murzakhanov, F. F., Sadovnikova, M. A., Mamin, G. V., Nagalyuk, S. S., von Bardeleben, H. J., Schmidt, W. G., Biktagirov, T., Gerstmann, U., & Soltamov, V. A. (2023). 14N Hyperfine and nuclear interactions of axial and basal NV centers in 4H-SiC: A high frequency (94 GHz) ENDOR study. Journal of Applied Physics, 134(12). https://doi.org/10.1063/5.0170099"},"department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"790"},{"_id":"27"},{"_id":"230"}],"user_id":"16199","_id":"54853","project":[{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"type":"journal_article","status":"public"},{"article_type":"original","extern":"1","language":[{"iso":"eng"}],"_id":"45764","user_id":"78800","abstract":[{"text":"As a benchmark, the structural, electronic and optical properties of the three main phases of TiO$\\rm{_2}$ crystals have been calculated using Hubbard U correction and hybrid functional methods in density-functional theory. These calculations are compared concerning the available experimental observations on pristine TiO$\\rm{_2}$ crystals. Modified hybrid functionals, particularly the PBE0 functional with 11.4% fraction of exact exchange, are shown to provide highly accurate atomic structures and also accurate electronic structure data, including optical excitation energies. With $\\rm{DFT+U}$, accurate optical spectra are also possible, but only if the Hubbard U is applied on the O $\\rm2p$ electrons exclusively. Furthermore, both methods, the 11.4%-PBE0 hybrid functional and the $\\rm{DFT+U_p}$ scheme have been used to study TiO$\\rm{_2}$ amorphous ultra-thin films, confirming the agreement of the two methods even with respect to small details of the optical spectra. Our results show that the proposed $\\rm{DFT+U_p}$ methodology is computationally efficient, but still accurate. It can be applied to well-ordered TiO$\\rm{_2}$ polymorphs as well as to amorphous TiO$\\rm{_2}$ and will allow for the calculations of complex titania-based structures.","lang":"eng"}],"status":"public","type":"journal_article","publication":"Materials Research Express","title":"Rutile, anatase, brookite and titania thin film from Hubbard corrected and hybrid DFT","main_file_link":[{"open_access":"1","url":"https://iopscience.iop.org/article/10.1088/2053-1591/ace0fa/pdf"}],"doi":"10.1088/2053-1591/ace0fa","date_updated":"2023-06-26T09:34:06Z","oa":"1","publisher":"IOP Publishing","author":[{"first_name":"Sabuhi","orcid":"0000-0002-8481-4161","last_name":"Badalov","full_name":"Badalov, Sabuhi","id":"78800"},{"full_name":"Bocchini, Adriana","id":"58349","orcid":"0000-0002-2134-3075","last_name":"Bocchini","first_name":"Adriana"},{"first_name":"Rene","full_name":"Wilhelm, Rene","last_name":"Wilhelm"},{"full_name":"Kozub, A. L.","last_name":"Kozub","first_name":"A. L."},{"last_name":"Gerstmann","orcid":"0000-0002-4476-223X","full_name":"Gerstmann, Uwe","id":"171","first_name":"Uwe"},{"first_name":"Wolf Gero","last_name":"Schmidt","orcid":"0000-0002-2717-5076","id":"468","full_name":"Schmidt, Wolf Gero"}],"date_created":"2023-06-26T02:18:11Z","year":"2023","citation":{"ama":"Badalov S, Bocchini A, Wilhelm R, Kozub AL, Gerstmann U, Schmidt WG. Rutile, anatase, brookite and titania thin film from Hubbard corrected and hybrid DFT. Materials Research Express. doi:10.1088/2053-1591/ace0fa","chicago":"Badalov, Sabuhi, Adriana Bocchini, Rene Wilhelm, A. L. Kozub, Uwe Gerstmann, and Wolf Gero Schmidt. “Rutile, Anatase, Brookite and Titania Thin Film from Hubbard Corrected and Hybrid DFT.” Materials Research Express, n.d. https://doi.org/10.1088/2053-1591/ace0fa.","ieee":"S. Badalov, A. Bocchini, R. Wilhelm, A. L. Kozub, U. Gerstmann, and W. G. Schmidt, “Rutile, anatase, brookite and titania thin film from Hubbard corrected and hybrid DFT,” Materials Research Express, doi: 10.1088/2053-1591/ace0fa.","apa":"Badalov, S., Bocchini, A., Wilhelm, R., Kozub, A. L., Gerstmann, U., & Schmidt, W. G. (n.d.). Rutile, anatase, brookite and titania thin film from Hubbard corrected and hybrid DFT. Materials Research Express. https://doi.org/10.1088/2053-1591/ace0fa","bibtex":"@article{Badalov_Bocchini_Wilhelm_Kozub_Gerstmann_Schmidt, title={Rutile, anatase, brookite and titania thin film from Hubbard corrected and hybrid DFT}, DOI={10.1088/2053-1591/ace0fa}, journal={Materials Research Express}, publisher={IOP Publishing}, author={Badalov, Sabuhi and Bocchini, Adriana and Wilhelm, Rene and Kozub, A. L. and Gerstmann, Uwe and Schmidt, Wolf Gero} }","mla":"Badalov, Sabuhi, et al. “Rutile, Anatase, Brookite and Titania Thin Film from Hubbard Corrected and Hybrid DFT.” Materials Research Express, IOP Publishing, doi:10.1088/2053-1591/ace0fa.","short":"S. Badalov, A. Bocchini, R. Wilhelm, A.L. Kozub, U. Gerstmann, W.G. Schmidt, Materials Research Express (n.d.)."},"publication_status":"accepted","related_material":{"link":[{"relation":"confirmation","url":"https://iopscience.iop.org/article/10.1088/2053-1591/ace0fa"}]}},{"language":[{"iso":"eng"}],"project":[{"name":"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"},{"_id":"54","name":"TRR 142 - Project Area A"},{"_id":"55","name":"TRR 142 - Project Area B"},{"name":"TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)","_id":"168"},{"_id":"166","name":"TRR 142 - Subproject A11"}],"_id":"61362","user_id":"16199","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"790"},{"_id":"288"},{"_id":"230"},{"_id":"429"},{"_id":"35"},{"_id":"27"}],"abstract":[{"lang":"eng","text":"We study the interaction of gray tracking and DC ionic conductivity in Potassium Titanyl Phosphate (KTiOPO4, KTP) and present a novel way to reduce conductivity via a potassium nitrate treatment improving the device quality."}],"status":"public","type":"conference","publication":"CLEO 2023","title":"Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance","doi":"10.1364/cleo_at.2023.jw2a.57","date_updated":"2025-09-18T12:08:56Z","publisher":"Optica Publishing Group","author":[{"last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","id":"13244","full_name":"Eigner, Christof","first_name":"Christof"},{"last_name":"Padberg","id":"40300","full_name":"Padberg, Laura","first_name":"Laura"},{"last_name":"Quiring","full_name":"Quiring, Viktor","first_name":"Viktor"},{"id":"58349","full_name":"Bocchini, Adriana","orcid":"0000-0002-2134-3075","last_name":"Bocchini","first_name":"Adriana"},{"first_name":"Matteo","orcid":"0000-0001-5718-358X","last_name":"Santandrea","id":"55095","full_name":"Santandrea, Matteo"},{"orcid":"0000-0002-4476-223X","last_name":"Gerstmann","id":"171","full_name":"Gerstmann, Uwe","first_name":"Uwe"},{"last_name":"Schmidt","orcid":"0000-0002-2717-5076","full_name":"Schmidt, Wolf Gero","id":"468","first_name":"Wolf Gero"},{"last_name":"Silberhorn","id":"26263","full_name":"Silberhorn, Christine","first_name":"Christine"}],"date_created":"2025-09-18T12:06:19Z","year":"2023","citation":{"chicago":"Eigner, Christof, Laura Padberg, Viktor Quiring, Adriana Bocchini, Matteo Santandrea, Uwe Gerstmann, Wolf Gero Schmidt, and Christine Silberhorn. “Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance.” In CLEO 2023. Optica Publishing Group, 2023. https://doi.org/10.1364/cleo_at.2023.jw2a.57.","ieee":"C. Eigner et al., “Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance,” 2023, doi: 10.1364/cleo_at.2023.jw2a.57.","ama":"Eigner C, Padberg L, Quiring V, et al. Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance. In: CLEO 2023. Optica Publishing Group; 2023. doi:10.1364/cleo_at.2023.jw2a.57","short":"C. Eigner, L. Padberg, V. Quiring, A. Bocchini, M. Santandrea, U. Gerstmann, W.G. Schmidt, C. Silberhorn, in: CLEO 2023, Optica Publishing Group, 2023.","mla":"Eigner, Christof, et al. “Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance.” CLEO 2023, Optica Publishing Group, 2023, doi:10.1364/cleo_at.2023.jw2a.57.","bibtex":"@inproceedings{Eigner_Padberg_Quiring_Bocchini_Santandrea_Gerstmann_Schmidt_Silberhorn_2023, title={Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance}, DOI={10.1364/cleo_at.2023.jw2a.57}, booktitle={CLEO 2023}, publisher={Optica Publishing Group}, author={Eigner, Christof and Padberg, Laura and Quiring, Viktor and Bocchini, Adriana and Santandrea, Matteo and Gerstmann, Uwe and Schmidt, Wolf Gero and Silberhorn, Christine}, year={2023} }","apa":"Eigner, C., Padberg, L., Quiring, V., Bocchini, A., Santandrea, M., Gerstmann, U., Schmidt, W. G., & Silberhorn, C. (2023). Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance. CLEO 2023. https://doi.org/10.1364/cleo_at.2023.jw2a.57"},"publication_status":"published"},{"title":"Third‐Order Susceptibility of Lithium Niobate: Influence of Polarons and Bipolarons","publisher":"Wiley","date_created":"2024-06-24T05:59:11Z","year":"2022","issue":"2","language":[{"iso":"eng"}],"abstract":[{"text":"The third‐order susceptibility of lithium niobate (LiNbO3) is calculated within a Berry‐phase formulation of the dynamical polarization based on the electronic structure obtained within density‐functional theory (DFT). Maximum values of the order of m V are calculated for photon energies between 1.2 and 2 eV, i.e., in the lower half of the optical bandgap of lithium niobate. Both free and bound electron (bi)polarons are found to lead to a remarkable enhancement of the third‐order susceptibility for photon energies below 1 eV.","lang":"eng"}],"publication":"physica status solidi (b)","doi":"10.1002/pssb.202200453","date_updated":"2024-06-24T06:02:58Z","author":[{"first_name":"Agnieszka L.","full_name":"Kozub, Agnieszka L.","last_name":"Kozub"},{"first_name":"Uwe","id":"171","full_name":"Gerstmann, Uwe","orcid":"0000-0002-4476-223X","last_name":"Gerstmann"},{"id":"468","full_name":"Schmidt, Wolf Gero","orcid":"0000-0002-2717-5076","last_name":"Schmidt","first_name":"Wolf Gero"}],"volume":260,"citation":{"ama":"Kozub AL, Gerstmann U, Schmidt WG. Third‐Order Susceptibility of Lithium Niobate: Influence of Polarons and Bipolarons. physica status solidi (b). 2022;260(2). doi:10.1002/pssb.202200453","ieee":"A. L. Kozub, U. Gerstmann, and W. G. Schmidt, “Third‐Order Susceptibility of Lithium Niobate: Influence of Polarons and Bipolarons,” physica status solidi (b), vol. 260, no. 2, 2022, doi: 10.1002/pssb.202200453.","chicago":"Kozub, Agnieszka L., Uwe Gerstmann, and Wolf Gero Schmidt. “Third‐Order Susceptibility of Lithium Niobate: Influence of Polarons and Bipolarons.” Physica Status Solidi (b) 260, no. 2 (2022). https://doi.org/10.1002/pssb.202200453.","bibtex":"@article{Kozub_Gerstmann_Schmidt_2022, title={Third‐Order Susceptibility of Lithium Niobate: Influence of Polarons and Bipolarons}, volume={260}, DOI={10.1002/pssb.202200453}, number={2}, journal={physica status solidi (b)}, publisher={Wiley}, author={Kozub, Agnieszka L. and Gerstmann, Uwe and Schmidt, Wolf Gero}, year={2022} }","short":"A.L. Kozub, U. Gerstmann, W.G. Schmidt, Physica Status Solidi (b) 260 (2022).","mla":"Kozub, Agnieszka L., et al. “Third‐Order Susceptibility of Lithium Niobate: Influence of Polarons and Bipolarons.” Physica Status Solidi (b), vol. 260, no. 2, Wiley, 2022, doi:10.1002/pssb.202200453.","apa":"Kozub, A. L., Gerstmann, U., & Schmidt, W. G. (2022). Third‐Order Susceptibility of Lithium Niobate: Influence of Polarons and Bipolarons. Physica Status Solidi (b), 260(2). https://doi.org/10.1002/pssb.202200453"},"intvolume":" 260","publication_status":"published","publication_identifier":{"issn":["0370-1972","1521-3951"]},"project":[{"_id":"53","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","grant_number":"231447078"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"_id":"54849","user_id":"16199","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"790"},{"_id":"230"},{"_id":"429"},{"_id":"27"}],"status":"public","type":"journal_article"},{"publication_identifier":{"issn":["0947-8396","1432-0630"]},"publication_status":"published","year":"2022","page":"480","intvolume":" 128","citation":{"mla":"Krenz, Marvin, et al. “Bound Polaron Formation in Lithium Niobate from Ab Initio Molecular Dynamics.” Applied Physics A, vol. 128, Springer Science and Business Media LLC, 2022, p. 480, doi:10.1007/s00339-022-05577-y.","short":"M. Krenz, U. Gerstmann, W.G. Schmidt, Applied Physics A 128 (2022) 480.","bibtex":"@article{Krenz_Gerstmann_Schmidt_2022, title={Bound polaron formation in lithium niobate from ab initio molecular dynamics}, volume={128}, DOI={10.1007/s00339-022-05577-y}, journal={Applied Physics A}, publisher={Springer Science and Business Media LLC}, author={Krenz, Marvin and Gerstmann, Uwe and Schmidt, Wolf Gero}, year={2022}, pages={480} }","apa":"Krenz, M., Gerstmann, U., & Schmidt, W. G. (2022). Bound polaron formation in lithium niobate from ab initio molecular dynamics. Applied Physics A, 128, 480. https://doi.org/10.1007/s00339-022-05577-y","ieee":"M. Krenz, U. Gerstmann, and W. G. Schmidt, “Bound polaron formation in lithium niobate from ab initio molecular dynamics,” Applied Physics A, vol. 128, p. 480, 2022, doi: 10.1007/s00339-022-05577-y.","chicago":"Krenz, Marvin, Uwe Gerstmann, and Wolf Gero Schmidt. “Bound Polaron Formation in Lithium Niobate from Ab Initio Molecular Dynamics.” Applied Physics A 128 (2022): 480. https://doi.org/10.1007/s00339-022-05577-y.","ama":"Krenz M, Gerstmann U, Schmidt WG. Bound polaron formation in lithium niobate from ab initio molecular dynamics. Applied Physics A. 2022;128:480. doi:10.1007/s00339-022-05577-y"},"date_updated":"2023-04-21T11:06:37Z","publisher":"Springer Science and Business Media LLC","volume":128,"author":[{"first_name":"Marvin","last_name":"Krenz","full_name":"Krenz, Marvin","id":"52309"},{"first_name":"Uwe","id":"171","full_name":"Gerstmann, Uwe","orcid":"0000-0002-4476-223X","last_name":"Gerstmann"},{"last_name":"Schmidt","orcid":"0000-0002-2717-5076","id":"468","full_name":"Schmidt, Wolf Gero","first_name":"Wolf Gero"}],"date_created":"2023-01-20T11:18:44Z","title":"Bound polaron formation in lithium niobate from ab initio molecular dynamics","doi":"10.1007/s00339-022-05577-y","publication":"Applied Physics A","type":"journal_article","abstract":[{"text":"AbstractPolarons influence decisively the performance of lithium niobate for optical applications. In this work, the formation of (defect) bound polarons in lithium niobate is studied by ab initio molecular dynamics. The calculations show a broad scatter of polaron formation times. Rising temperature increases the share of trajectories with long formation times, which leads to an overall increase of the average formation time with temperature. However, even at elevated temperatures, the average formation time does not exceed the value of 100 femtoseconds, i.e., a value close to the time measured for free, i.e., self-trapped polarons. Analyzing individual trajectories, it is found that the time required for the structural relaxation of the polarons depends sensitively on the excitation of the lithium niobate high-frequency phonon modes and their phase relation.","lang":"eng"}],"status":"public","_id":"37711","project":[{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"},{"_id":"53","name":"TRR 142: TRR 142"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"_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"}],"department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"230"},{"_id":"429"},{"_id":"35"},{"_id":"790"}],"user_id":"171","keyword":["General Materials Science","General Chemistry"],"language":[{"iso":"eng"}]},{"date_created":"2022-09-26T13:12:48Z","author":[{"first_name":"Laura","last_name":"Padberg","id":"40300","full_name":"Padberg, Laura"},{"first_name":"Viktor","full_name":"Quiring, Viktor","last_name":"Quiring"},{"orcid":"0000-0002-2134-3075","last_name":"Bocchini","full_name":"Bocchini, Adriana","id":"58349","first_name":"Adriana"},{"first_name":"Matteo","full_name":"Santandrea, Matteo","id":"55095","orcid":"0000-0001-5718-358X","last_name":"Santandrea"},{"first_name":"Uwe","id":"171","full_name":"Gerstmann, Uwe","orcid":"0000-0002-4476-223X","last_name":"Gerstmann"},{"first_name":"Wolf Gero","last_name":"Schmidt","orcid":"0000-0002-2717-5076","id":"468","full_name":"Schmidt, Wolf Gero"},{"last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263","first_name":"Christine"},{"first_name":"Christof","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","full_name":"Eigner, Christof","id":"13244"}],"volume":12,"date_updated":"2023-04-21T11:07:11Z","oa":"1","main_file_link":[{"open_access":"1"}],"doi":"10.3390/cryst12101359","title":"DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking","publication_identifier":{"issn":["2073-4352"]},"citation":{"apa":"Padberg, L., Quiring, V., Bocchini, A., Santandrea, M., Gerstmann, U., Schmidt, W. G., Silberhorn, C., & Eigner, C. (2022). DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking. Crystals, 12, 1359. https://doi.org/10.3390/cryst12101359","bibtex":"@article{Padberg_Quiring_Bocchini_Santandrea_Gerstmann_Schmidt_Silberhorn_Eigner_2022, title={DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking}, volume={12}, DOI={10.3390/cryst12101359}, journal={Crystals}, author={Padberg, Laura and Quiring, Viktor and Bocchini, Adriana and Santandrea, Matteo and Gerstmann, Uwe and Schmidt, Wolf Gero and Silberhorn, Christine and Eigner, Christof}, year={2022}, pages={1359} }","short":"L. Padberg, V. Quiring, A. Bocchini, M. Santandrea, U. Gerstmann, W.G. Schmidt, C. Silberhorn, C. Eigner, Crystals 12 (2022) 1359.","mla":"Padberg, Laura, et al. “DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking.” Crystals, vol. 12, 2022, p. 1359, doi:10.3390/cryst12101359.","ieee":"L. Padberg et al., “DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking,” Crystals, vol. 12, p. 1359, 2022, doi: 10.3390/cryst12101359.","chicago":"Padberg, Laura, Viktor Quiring, Adriana Bocchini, Matteo Santandrea, Uwe Gerstmann, Wolf Gero Schmidt, Christine Silberhorn, and Christof Eigner. “DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking.” Crystals 12 (2022): 1359. https://doi.org/10.3390/cryst12101359.","ama":"Padberg L, Quiring V, Bocchini A, et al. DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking. Crystals. 2022;12:1359. doi:10.3390/cryst12101359"},"page":"1359","intvolume":" 12","year":"2022","user_id":"171","department":[{"_id":"15"},{"_id":"288"},{"_id":"623"},{"_id":"170"},{"_id":"295"},{"_id":"230"},{"_id":"429"},{"_id":"35"},{"_id":"790"}],"project":[{"name":"TRR 142: TRR 142","_id":"53"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"name":"TRR 142 - B07: TRR 142 - Subproject B07","_id":"168"},{"_id":"54","name":"TRR 142 - A: TRR 142 - Project Area A"},{"_id":"166","name":"TRR 142 - A11: TRR 142 - Subproject A11"}],"_id":"33484","language":[{"iso":"eng"}],"type":"journal_article","publication":"Crystals","status":"public","abstract":[{"text":"We study the DC conductivity in potassium titanyl phosphate (KTiOPO4, KTP) and its isomorphs KTiOAsO4 (KTA) and Rb1%K99%TiOPO4 (RKTP) and introduce a method by which to reduce the overall ionic conductivity in KTP by a potassium nitrate treatment. Furthermore, we create so-called gray tracking in KTP and investigate the ionic conductivity in theses areas. A local unintended reduction of the ionic conductivity is observed in the gray-tracked regions, which also induce additional optical absorption in the material. We show that a thermal treatment in an oxygen-rich atmosphere removes the gray tracking and brings the ionic conductivity as well as the optical transmission back to the original level. These studies can help to choose the best material and treatment for specific applications.","lang":"eng"}]},{"ddc":["530"],"language":[{"iso":"eng"}],"file_date_updated":"2022-10-31T15:05:24Z","project":[{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"},{"_id":"53","name":"TRR 142: TRR 142"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"_id":"166","name":"TRR 142 - A11: TRR 142 - Subproject A11"},{"_id":"168","name":"TRR 142 - B07: TRR 142 - Subproject B07"}],"_id":"33965","user_id":"171","department":[{"_id":"15"},{"_id":"295"},{"_id":"230"},{"_id":"2"},{"_id":"165"},{"_id":"633"},{"_id":"429"},{"_id":"35"},{"_id":"790"}],"file":[{"success":1,"relation":"main_file","content_type":"application/pdf","file_size":3945388,"file_id":"33966","file_name":"PhysRevMaterials.6.105401.pdf","access_level":"closed","date_updated":"2022-10-31T15:05:24Z","date_created":"2022-10-31T15:05:24Z","creator":"adrianab"}],"status":"public","type":"journal_article","publication":"Phys. Rev. Materials","title":"Electrochemical performance of KTiOAsO_4 (KTA) in potassium-ion batteries from density-functional theory","main_file_link":[{"open_access":"1","url":"https://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.6.105401"}],"doi":"10.1103/PhysRevMaterials.6.105401","date_updated":"2023-04-21T11:30:08Z","oa":"1","publisher":"American Physical Society","author":[{"orcid":"0000-0002-2134-3075","last_name":"Bocchini","id":"58349","full_name":"Bocchini, Adriana","first_name":"Adriana"},{"first_name":"Uwe","full_name":"Gerstmann, Uwe","id":"171","orcid":"0000-0002-4476-223X","last_name":"Gerstmann"},{"full_name":"Bartley, Tim","id":"49683","last_name":"Bartley","first_name":"Tim"},{"full_name":"Steinrück, Hans-Georg","id":"84268","last_name":"Steinrück","orcid":"0000-0001-6373-0877","first_name":"Hans-Georg"},{"last_name":"Henkel","full_name":"Henkel, Gerald","first_name":"Gerald"},{"first_name":"Wolf Gero","full_name":"Schmidt, Wolf Gero","id":"468","last_name":"Schmidt","orcid":"0000-0002-2717-5076"}],"date_created":"2022-10-31T15:00:19Z","volume":6,"year":"2022","citation":{"chicago":"Bocchini, Adriana, Uwe Gerstmann, Tim Bartley, Hans-Georg Steinrück, Gerald Henkel, and Wolf Gero Schmidt. “Electrochemical Performance of KTiOAsO_4 (KTA) in Potassium-Ion Batteries from Density-Functional Theory.” Phys. Rev. Materials 6 (2022): 105401. https://doi.org/10.1103/PhysRevMaterials.6.105401.","ieee":"A. Bocchini, U. Gerstmann, T. Bartley, H.-G. Steinrück, G. Henkel, and W. G. Schmidt, “Electrochemical performance of KTiOAsO_4 (KTA) in potassium-ion batteries from density-functional theory,” Phys. Rev. Materials, vol. 6, p. 105401, 2022, doi: 10.1103/PhysRevMaterials.6.105401.","ama":"Bocchini A, Gerstmann U, Bartley T, Steinrück H-G, Henkel G, Schmidt WG. Electrochemical performance of KTiOAsO_4 (KTA) in potassium-ion batteries from density-functional theory. Phys Rev Materials. 2022;6:105401. doi:10.1103/PhysRevMaterials.6.105401","short":"A. Bocchini, U. Gerstmann, T. Bartley, H.-G. Steinrück, G. Henkel, W.G. Schmidt, Phys. Rev. Materials 6 (2022) 105401.","mla":"Bocchini, Adriana, et al. “Electrochemical Performance of KTiOAsO_4 (KTA) in Potassium-Ion Batteries from Density-Functional Theory.” Phys. Rev. Materials, vol. 6, American Physical Society, 2022, p. 105401, doi:10.1103/PhysRevMaterials.6.105401.","bibtex":"@article{Bocchini_Gerstmann_Bartley_Steinrück_Henkel_Schmidt_2022, title={Electrochemical performance of KTiOAsO_4 (KTA) in potassium-ion batteries from density-functional theory}, volume={6}, DOI={10.1103/PhysRevMaterials.6.105401}, journal={Phys. Rev. Materials}, publisher={American Physical Society}, author={Bocchini, Adriana and Gerstmann, Uwe and Bartley, Tim and Steinrück, Hans-Georg and Henkel, Gerald and Schmidt, Wolf Gero}, year={2022}, pages={105401} }","apa":"Bocchini, A., Gerstmann, U., Bartley, T., Steinrück, H.-G., Henkel, G., & Schmidt, W. G. (2022). Electrochemical performance of KTiOAsO_4 (KTA) in potassium-ion batteries from density-functional theory. Phys. Rev. Materials, 6, 105401. https://doi.org/10.1103/PhysRevMaterials.6.105401"},"page":"105401","intvolume":" 6","publication_status":"published","has_accepted_license":"1"},{"intvolume":" 105","page":"205118","citation":{"apa":"Bocchini, A., Gerstmann, U., & Schmidt, W. G. (2022). Oxygen vacancies in KTiOPO_4: Optical absorption from hybrid DFT. Phys. Rev. B, 105, 205118. https://doi.org/10.1103/PhysRevB.105.205118","mla":"Bocchini, Adriana, et al. “Oxygen Vacancies in KTiOPO_4: Optical Absorption from Hybrid DFT.” Phys. Rev. B, vol. 105, American Physical Society, 2022, p. 205118, doi:10.1103/PhysRevB.105.205118.","bibtex":"@article{Bocchini_Gerstmann_Schmidt_2022, title={Oxygen vacancies in KTiOPO_4: Optical absorption from hybrid DFT}, volume={105}, DOI={10.1103/PhysRevB.105.205118}, journal={Phys. Rev. B}, publisher={American Physical Society}, author={Bocchini, Adriana and Gerstmann, Uwe and Schmidt, Wolf Gero}, year={2022}, pages={205118} }","short":"A. Bocchini, U. Gerstmann, W.G. Schmidt, Phys. Rev. B 105 (2022) 205118.","ieee":"A. Bocchini, U. Gerstmann, and W. G. Schmidt, “Oxygen vacancies in KTiOPO_4: Optical absorption from hybrid DFT,” Phys. Rev. B, vol. 105, p. 205118, 2022, doi: 10.1103/PhysRevB.105.205118.","chicago":"Bocchini, Adriana, Uwe Gerstmann, and Wolf Gero Schmidt. “Oxygen Vacancies in KTiOPO_4: Optical Absorption from Hybrid DFT.” Phys. Rev. B 105 (2022): 205118. https://doi.org/10.1103/PhysRevB.105.205118.","ama":"Bocchini A, Gerstmann U, Schmidt WG. Oxygen vacancies in KTiOPO_4: Optical absorption from hybrid DFT. Phys Rev B. 2022;105:205118. doi:10.1103/PhysRevB.105.205118"},"year":"2022","doi":"10.1103/PhysRevB.105.205118","title":"Oxygen vacancies in KTiOPO_4: Optical absorption from hybrid DFT","volume":105,"author":[{"last_name":"Bocchini","orcid":"0000-0002-2134-3075","full_name":"Bocchini, Adriana","id":"58349","first_name":"Adriana"},{"first_name":"Uwe","id":"171","full_name":"Gerstmann, Uwe","orcid":"0000-0002-4476-223X","last_name":"Gerstmann"},{"first_name":"Wolf Gero","last_name":"Schmidt","orcid":"0000-0002-2717-5076","full_name":"Schmidt, Wolf Gero","id":"468"}],"date_created":"2022-05-16T14:41:02Z","publisher":"American Physical Society","date_updated":"2023-04-21T11:29:05Z","status":"public","publication":"Phys. Rev. B","type":"journal_article","language":[{"iso":"eng"}],"department":[{"_id":"15"},{"_id":"295"},{"_id":"170"},{"_id":"230"},{"_id":"429"},{"_id":"35"},{"_id":"790"}],"user_id":"171","_id":"31254","project":[{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"name":"TRR 142: TRR 142","_id":"53"},{"_id":"54","name":"TRR 142 - A: TRR 142 - Project Area A"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"_id":"166","name":"TRR 142 - A11: TRR 142 - Subproject A11"},{"_id":"168","name":"TRR 142 - B07: TRR 142 - Subproject B07"}]},{"title":"A density-functional theory study of hole and defect-bound exciton polarons in lithium niobate","date_created":"2023-04-20T13:52:44Z","publisher":"MDPI AG","year":"2022","issue":"11","quality_controlled":"1","language":[{"iso":"eng"}],"ddc":["530"],"external_id":{"isi":["000895837200001"]},"file":[{"relation":"main_file","content_type":"application/pdf","file_id":"45570","access_level":"open_access","file_name":"crystals-12-01586-v2.pdf","description":"Creative Commons Attribution 4.0 International Public License (CC BY 4.0)","file_size":1762554,"title":"A density-functional theory study of hole and defect-bound exciton polarons in lithium niobate","date_created":"2023-06-11T23:59:27Z","creator":"schindlm","date_updated":"2023-06-12T00:22:51Z"}],"abstract":[{"text":"Hole polarons and defect-bound exciton polarons in lithium niobate are investigated by means of density-functional theory, where the localization of the holes is achieved by applying the +U approach to the oxygen 2p orbitals. We find three principal configurations of hole polarons: (i) self-trapped holes localized at displaced regular oxygen atoms and (ii) two other configurations bound to a lithium vacancy either at a threefold coordinated oxygen atom above or at a two-fold coordinated oxygen atom below the defect. The latter is the most stable and is in excellent quantitative agreement with measured g factors from electron paramagnetic resonance. Due to the absence of mid-gap states, none of these hole polarons can explain the broad optical absorption centered between 2.5 and 2.8 eV that is observed in transient absorption spectroscopy, but such states appear if a free electron polaron is trapped at the same lithium vacancy as the bound hole polaron, resulting in an exciton polaron. The dielectric function calculated by solving the Bethe–Salpeter equation indeed yields an optical peak at 2.6 eV in agreement with the two-photon experiments. The coexistence of hole and exciton polarons, which are simultaneously created in optical excitations, thus satisfactorily explains the reported experimental data.","lang":"eng"}],"publication":"Crystals","doi":"10.3390/cryst12111586","volume":12,"author":[{"last_name":"Schmidt","orcid":"0000-0002-5071-5528","full_name":"Schmidt, Falko","id":"35251","first_name":"Falko"},{"orcid":"0000-0001-6584-0201","last_name":"Kozub","full_name":"Kozub, Agnieszka L.","id":"77566","first_name":"Agnieszka L."},{"id":"171","full_name":"Gerstmann, Uwe","orcid":"0000-0002-4476-223X","last_name":"Gerstmann","first_name":"Uwe"},{"last_name":"Schmidt","orcid":"0000-0002-2717-5076","full_name":"Schmidt, Wolf Gero","id":"468","first_name":"Wolf Gero"},{"first_name":"Arno","last_name":"Schindlmayr","orcid":"0000-0002-4855-071X","id":"458","full_name":"Schindlmayr, Arno"}],"date_updated":"2025-09-18T13:28:05Z","oa":"1","intvolume":" 12","citation":{"chicago":"Schmidt, Falko, Agnieszka L. Kozub, Uwe Gerstmann, Wolf Gero Schmidt, and Arno Schindlmayr. “A Density-Functional Theory Study of Hole and Defect-Bound Exciton Polarons in Lithium Niobate.” Crystals 12, no. 11 (2022). https://doi.org/10.3390/cryst12111586.","ieee":"F. Schmidt, A. L. Kozub, U. Gerstmann, W. G. Schmidt, and A. Schindlmayr, “A density-functional theory study of hole and defect-bound exciton polarons in lithium niobate,” Crystals, vol. 12, no. 11, Art. no. 1586, 2022, doi: 10.3390/cryst12111586.","ama":"Schmidt F, Kozub AL, Gerstmann U, Schmidt WG, Schindlmayr A. A density-functional theory study of hole and defect-bound exciton polarons in lithium niobate. Crystals. 2022;12(11). doi:10.3390/cryst12111586","mla":"Schmidt, Falko, et al. “A Density-Functional Theory Study of Hole and Defect-Bound Exciton Polarons in Lithium Niobate.” Crystals, vol. 12, no. 11, 1586, MDPI AG, 2022, doi:10.3390/cryst12111586.","short":"F. Schmidt, A.L. Kozub, U. Gerstmann, W.G. Schmidt, A. Schindlmayr, Crystals 12 (2022).","bibtex":"@article{Schmidt_Kozub_Gerstmann_Schmidt_Schindlmayr_2022, title={A density-functional theory study of hole and defect-bound exciton polarons in lithium niobate}, volume={12}, DOI={10.3390/cryst12111586}, number={111586}, journal={Crystals}, publisher={MDPI AG}, author={Schmidt, Falko and Kozub, Agnieszka L. and Gerstmann, Uwe and Schmidt, Wolf Gero and Schindlmayr, Arno}, year={2022} }","apa":"Schmidt, F., Kozub, A. L., Gerstmann, U., Schmidt, W. G., & Schindlmayr, A. (2022). A density-functional theory study of hole and defect-bound exciton polarons in lithium niobate. Crystals, 12(11), Article 1586. https://doi.org/10.3390/cryst12111586"},"has_accepted_license":"1","publication_identifier":{"eissn":["2073-4352"]},"publication_status":"published","file_date_updated":"2023-06-12T00:22:51Z","isi":"1","article_type":"original","article_number":"1586","department":[{"_id":"15"},{"_id":"296"},{"_id":"170"},{"_id":"295"},{"_id":"35"},{"_id":"230"},{"_id":"429"},{"_id":"27"}],"user_id":"16199","_id":"44088","project":[{"_id":"53","name":"TRR 142: TRR 142"},{"_id":"54","name":"TRR 142 - A: TRR 142 - Project Area A"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"name":"TRR 142 - B04: TRR 142 - Subproject B04","_id":"69"},{"name":"TRR 142 - B07: TRR 142 - Subproject B07","_id":"168"},{"_id":"166","name":"TRR 142 - A11: TRR 142 - Subproject A11"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"status":"public","type":"journal_article"},{"language":[{"iso":"eng"}],"keyword":["Mechanical Engineering","Condensed Matter Physics","General Materials Science","General Chemistry","Bioengineering"],"user_id":"16199","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"230"},{"_id":"429"},{"_id":"35"},{"_id":"790"}],"project":[{"_id":"53","name":"TRR 142: TRR 142"},{"_id":"54","name":"TRR 142 - A: TRR 142 - Project Area A"},{"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"},{"_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":"37713","status":"public","type":"journal_article","publication":"Nano Letters","doi":"10.1021/acs.nanolett.1c04610","title":"Electron–Nuclear Coherent Coupling and Nuclear Spin Readout through Optically Polarized VB– Spin States in hBN","author":[{"last_name":"Murzakhanov","full_name":"Murzakhanov, Fadis F.","first_name":"Fadis F."},{"first_name":"Georgy Vladimirovich","last_name":"Mamin","full_name":"Mamin, Georgy Vladimirovich"},{"full_name":"Orlinskii, Sergei Borisovich","last_name":"Orlinskii","first_name":"Sergei Borisovich"},{"orcid":"0000-0002-4476-223X","last_name":"Gerstmann","id":"171","full_name":"Gerstmann, Uwe","first_name":"Uwe"},{"first_name":"Wolf Gero","full_name":"Schmidt, Wolf Gero","id":"468","last_name":"Schmidt","orcid":"0000-0002-2717-5076"},{"full_name":"Biktagirov, Timur","id":"65612","last_name":"Biktagirov","first_name":"Timur"},{"last_name":"Aharonovich","full_name":"Aharonovich, Igor","first_name":"Igor"},{"last_name":"Gottscholl","full_name":"Gottscholl, Andreas","first_name":"Andreas"},{"first_name":"Andreas","last_name":"Sperlich","full_name":"Sperlich, Andreas"},{"last_name":"Dyakonov","full_name":"Dyakonov, Vladimir","first_name":"Vladimir"},{"full_name":"Soltamov, Victor A.","last_name":"Soltamov","first_name":"Victor A."}],"date_created":"2023-01-20T11:21:22Z","volume":22,"date_updated":"2025-12-05T13:57:24Z","publisher":"American Chemical Society (ACS)","citation":{"mla":"Murzakhanov, Fadis F., et al. “Electron–Nuclear Coherent Coupling and Nuclear Spin Readout through Optically Polarized VB– Spin States in HBN.” Nano Letters, vol. 22, no. 7, American Chemical Society (ACS), 2022, pp. 2718–24, doi:10.1021/acs.nanolett.1c04610.","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 VB– Spin States in hBN}, volume={22}, DOI={10.1021/acs.nanolett.1c04610}, 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., & Soltamov, V. A. (2022). Electron–Nuclear Coherent Coupling and Nuclear Spin Readout through Optically Polarized VB– Spin States in hBN. Nano Letters, 22(7), 2718–2724. https://doi.org/10.1021/acs.nanolett.1c04610","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 VB– Spin States in HBN.” Nano Letters 22, no. 7 (2022): 2718–24. https://doi.org/10.1021/acs.nanolett.1c04610.","ieee":"F. F. Murzakhanov et al., “Electron–Nuclear Coherent Coupling and Nuclear Spin Readout through Optically Polarized VB– Spin States in hBN,” Nano Letters, vol. 22, no. 7, pp. 2718–2724, 2022, doi: 10.1021/acs.nanolett.1c04610.","ama":"Murzakhanov FF, Mamin GV, Orlinskii SB, et al. Electron–Nuclear Coherent Coupling and Nuclear Spin Readout through Optically Polarized VB– Spin States in hBN. Nano Letters. 2022;22(7):2718-2724. doi:10.1021/acs.nanolett.1c04610"},"intvolume":" 22","page":"2718-2724","year":"2022","issue":"7","publication_status":"published","publication_identifier":{"issn":["1530-6984","1530-6992"]}},{"quality_controlled":"1","year":"2022","publisher":"MDPI","date_created":"2022-03-13T15:28:47Z","title":"Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response","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"}],"ddc":["530"],"language":[{"iso":"eng"}],"publication_status":"published","publication_identifier":{"eisbn":["978-3-0365-3339-1"],"isbn":["978-3-0365-3340-7"]},"place":"Basel","citation":{"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. New Trends in Lithium Niobate: From Bulk to Nanocrystals. MDPI; 2022:231-248. doi:10.3390/books978-3-0365-3339-1","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 New Trends in Lithium Niobate: From Bulk to Nanocrystals, edited by Gábor Corradi and László Kovács, 231–48. Basel: MDPI, 2022. https://doi.org/10.3390/books978-3-0365-3339-1.","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 New Trends in Lithium Niobate: From Bulk to Nanocrystals, G. Corradi and L. Kovács, Eds. Basel: MDPI, 2022, pp. 231–248.","apa":"Schmidt, F., Kozub, A. L., Gerstmann, U., Schmidt, W. G., & Schindlmayr, A. (2022). Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response. In G. Corradi & L. Kovács (Eds.), New Trends in Lithium Niobate: From Bulk to Nanocrystals (pp. 231–248). MDPI. https://doi.org/10.3390/books978-3-0365-3339-1","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.","mla":"Schmidt, Falko, et al. “Electron Polarons in Lithium Niobate: Charge Localization, Lattice Deformation, and Optical Response.” New Trends in Lithium Niobate: From Bulk to Nanocrystals, edited by Gábor Corradi and László Kovács, MDPI, 2022, pp. 231–48, doi:10.3390/books978-3-0365-3339-1.","bibtex":"@inbook{Schmidt_Kozub_Gerstmann_Schmidt_Schindlmayr_2022, place={Basel}, title={Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response}, DOI={10.3390/books978-3-0365-3339-1}, 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} }"},"page":"231-248","date_updated":"2025-12-05T14:00:04Z","author":[{"full_name":"Schmidt, Falko","id":"35251","orcid":"0000-0002-5071-5528","last_name":"Schmidt","first_name":"Falko"},{"full_name":"Kozub, Agnieszka L.","id":"77566","last_name":"Kozub","orcid":"https://orcid.org/0000-0001-6584-0201","first_name":"Agnieszka L."},{"orcid":"0000-0002-4476-223X","last_name":"Gerstmann","full_name":"Gerstmann, Uwe","id":"171","first_name":"Uwe"},{"first_name":"Wolf Gero","orcid":"0000-0002-2717-5076","last_name":"Schmidt","id":"468","full_name":"Schmidt, Wolf Gero"},{"first_name":"Arno","orcid":"0000-0002-4855-071X","last_name":"Schindlmayr","id":"458","full_name":"Schindlmayr, Arno"}],"doi":"10.3390/books978-3-0365-3339-1","type":"book_chapter","editor":[{"first_name":"Gábor","full_name":"Corradi, Gábor","last_name":"Corradi"},{"last_name":"Kovács","full_name":"Kovács, László","first_name":"László"}],"status":"public","project":[{"_id":"53","name":"TRR 142: TRR 142"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"_id":"69","name":"TRR 142 - B4: TRR 142 - Subproject B4"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"name":"TRR 142 - A11: TRR 142 - Subproject A11","_id":"166"},{"name":"TRR 142 - B07: TRR 142 - Subproject B07","_id":"168"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"},{"_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"}]},{"status":"public","publication":"The Journal of Physical Chemistry C","type":"journal_article","keyword":["Surfaces","Coatings and Films","Physical and Theoretical Chemistry","General Energy","Electronic","Optical and Magnetic Materials"],"language":[{"iso":"eng"}],"_id":"29748","project":[{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"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"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"35"},{"_id":"790"}],"user_id":"16199","year":"2021","intvolume":" 125","page":"20087-20093","citation":{"ieee":"D. Slawig, M. Gruschwitz, U. Gerstmann, E. Rauls, and C. Tegenkamp, “Adsorption and Reaction of PbPc on Hydrogenated Epitaxial Graphene,” The Journal of Physical Chemistry C, vol. 125, no. 36, pp. 20087–20093, 2021, doi: 10.1021/acs.jpcc.1c06320.","chicago":"Slawig, Diana, Markus Gruschwitz, Uwe Gerstmann, Eva Rauls, and Christoph Tegenkamp. “Adsorption and Reaction of PbPc on Hydrogenated Epitaxial Graphene.” The Journal of Physical Chemistry C 125, no. 36 (2021): 20087–93. https://doi.org/10.1021/acs.jpcc.1c06320.","ama":"Slawig D, Gruschwitz M, Gerstmann U, Rauls E, Tegenkamp C. Adsorption and Reaction of PbPc on Hydrogenated Epitaxial Graphene. The Journal of Physical Chemistry C. 2021;125(36):20087-20093. doi:10.1021/acs.jpcc.1c06320","short":"D. Slawig, M. Gruschwitz, U. Gerstmann, E. Rauls, C. Tegenkamp, The Journal of Physical Chemistry C 125 (2021) 20087–20093.","bibtex":"@article{Slawig_Gruschwitz_Gerstmann_Rauls_Tegenkamp_2021, title={Adsorption and Reaction of PbPc on Hydrogenated Epitaxial Graphene}, volume={125}, DOI={10.1021/acs.jpcc.1c06320}, number={36}, journal={The Journal of Physical Chemistry C}, publisher={American Chemical Society (ACS)}, author={Slawig, Diana and Gruschwitz, Markus and Gerstmann, Uwe and Rauls, Eva and Tegenkamp, Christoph}, year={2021}, pages={20087–20093} }","mla":"Slawig, Diana, et al. “Adsorption and Reaction of PbPc on Hydrogenated Epitaxial Graphene.” The Journal of Physical Chemistry C, vol. 125, no. 36, American Chemical Society (ACS), 2021, pp. 20087–93, doi:10.1021/acs.jpcc.1c06320.","apa":"Slawig, D., Gruschwitz, M., Gerstmann, U., Rauls, E., & Tegenkamp, C. (2021). Adsorption and Reaction of PbPc on Hydrogenated Epitaxial Graphene. The Journal of Physical Chemistry C, 125(36), 20087–20093. https://doi.org/10.1021/acs.jpcc.1c06320"},"publication_identifier":{"issn":["1932-7447","1932-7455"]},"publication_status":"published","issue":"36","title":"Adsorption and Reaction of PbPc on Hydrogenated Epitaxial Graphene","doi":"10.1021/acs.jpcc.1c06320","date_updated":"2023-04-20T16:04:22Z","publisher":"American Chemical Society (ACS)","volume":125,"author":[{"first_name":"Diana","last_name":"Slawig","full_name":"Slawig, Diana"},{"first_name":"Markus","last_name":"Gruschwitz","full_name":"Gruschwitz, Markus"},{"full_name":"Gerstmann, Uwe","id":"171","orcid":"0000-0002-4476-223X","last_name":"Gerstmann","first_name":"Uwe"},{"first_name":"Eva","full_name":"Rauls, Eva","last_name":"Rauls"},{"last_name":"Tegenkamp","full_name":"Tegenkamp, Christoph","first_name":"Christoph"}],"date_created":"2022-02-03T15:37:32Z"},{"citation":{"apa":"Schmidt, F., Kozub, A. L., Gerstmann, U., Schmidt, W. G., & Schindlmayr, A. (2021). Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response. Crystals, 11, 542. https://doi.org/10.3390/cryst11050542","mla":"Schmidt, Falko, et al. “Electron Polarons in Lithium Niobate: Charge Localization, Lattice Deformation, and Optical Response.” Crystals, vol. 11, MDPI, 2021, p. 542, doi:10.3390/cryst11050542.","bibtex":"@article{Schmidt_Kozub_Gerstmann_Schmidt_Schindlmayr_2021, title={Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response}, volume={11}, DOI={10.3390/cryst11050542}, journal={Crystals}, publisher={MDPI}, author={Schmidt, Falko and Kozub, Agnieszka L. and Gerstmann, Uwe and Schmidt, Wolf Gero and Schindlmayr, Arno}, year={2021}, pages={542} }","short":"F. Schmidt, A.L. Kozub, U. Gerstmann, W.G. Schmidt, A. Schindlmayr, Crystals 11 (2021) 542.","ama":"Schmidt F, Kozub AL, Gerstmann U, Schmidt WG, Schindlmayr A. Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response. Crystals. 2021;11:542. doi:10.3390/cryst11050542","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.” Crystals 11 (2021): 542. https://doi.org/10.3390/cryst11050542.","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,” Crystals, vol. 11, p. 542, 2021, doi: 10.3390/cryst11050542."},"page":"542","intvolume":" 11","publication_status":"published","has_accepted_license":"1","publication_identifier":{"eissn":["2073-4352"]},"doi":"10.3390/cryst11050542","author":[{"id":"35251","full_name":"Schmidt, Falko","orcid":"0000-0002-5071-5528","last_name":"Schmidt","first_name":"Falko"},{"first_name":"Agnieszka L.","id":"77566","full_name":"Kozub, Agnieszka L.","last_name":"Kozub","orcid":"https://orcid.org/0000-0001-6584-0201"},{"id":"171","full_name":"Gerstmann, Uwe","last_name":"Gerstmann","orcid":"0000-0002-4476-223X","first_name":"Uwe"},{"full_name":"Schmidt, Wolf Gero","id":"468","orcid":"0000-0002-2717-5076","last_name":"Schmidt","first_name":"Wolf Gero"},{"first_name":"Arno","full_name":"Schindlmayr, Arno","id":"458","last_name":"Schindlmayr","orcid":"0000-0002-4855-071X"}],"volume":11,"oa":"1","date_updated":"2023-04-21T11:20:15Z","status":"public","type":"journal_article","funded_apc":"1","file_date_updated":"2021-05-13T16:51:41Z","isi":"1","article_type":"original","user_id":"171","department":[{"_id":"296"},{"_id":"230"},{"_id":"429"},{"_id":"295"},{"_id":"15"},{"_id":"170"},{"_id":"35"},{"_id":"790"}],"project":[{"_id":"53","name":"TRR 142"},{"_id":"55","name":"TRR 142 - Project Area B"},{"_id":"69","name":"TRR 142 - Subproject B4"},{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"_id":"21946","year":"2021","quality_controlled":"1","title":"Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response","date_created":"2021-05-03T09:36:13Z","publisher":"MDPI","file":[{"access_level":"open_access","file_id":"22163","file_name":"crystals-11-00542.pdf","title":"Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response","file_size":3042827,"description":"Creative Commons Attribution 4.0 International Public License (CC BY 4.0)","creator":"schindlm","date_created":"2021-05-13T16:47:11Z","date_updated":"2021-05-13T16:51:41Z","relation":"main_file","content_type":"application/pdf"}],"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"}],"publication":"Crystals","language":[{"iso":"eng"}],"ddc":["530"],"external_id":{"isi":["000653822700001"]}},{"publication":"Physical Review B","type":"journal_article","status":"public","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"35"},{"_id":"790"}],"user_id":"171","_id":"22881","project":[{"name":"TRR 142","_id":"53"},{"_id":"55","name":"TRR 142 - Project Area B"},{"name":"TRR 142 - Subproject B4","_id":"69"},{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"language":[{"iso":"eng"}],"publication_identifier":{"issn":["2469-9950","2469-9969"]},"publication_status":"published","intvolume":" 103","page":"L201408","citation":{"ama":"Nguyen TTN, Sollfrank T, Tegenkamp C, Rauls E, Gerstmann U. Impact of screening and relaxation on weakly coupled two-dimensional heterostructures. Physical Review B. 2021;103:L201408. doi:10.1103/physrevb.103.l201408","ieee":"T. T. N. Nguyen, T. Sollfrank, C. Tegenkamp, E. Rauls, and U. Gerstmann, “Impact of screening and relaxation on weakly coupled two-dimensional heterostructures,” Physical Review B, vol. 103, p. L201408, 2021, doi: 10.1103/physrevb.103.l201408.","chicago":"Nguyen, T. T. Nhung, T. Sollfrank, C. Tegenkamp, E. Rauls, and Uwe Gerstmann. “Impact of Screening and Relaxation on Weakly Coupled Two-Dimensional Heterostructures.” Physical Review B 103 (2021): L201408. https://doi.org/10.1103/physrevb.103.l201408.","apa":"Nguyen, T. T. N., Sollfrank, T., Tegenkamp, C., Rauls, E., & Gerstmann, U. (2021). Impact of screening and relaxation on weakly coupled two-dimensional heterostructures. Physical Review B, 103, L201408. https://doi.org/10.1103/physrevb.103.l201408","bibtex":"@article{Nguyen_Sollfrank_Tegenkamp_Rauls_Gerstmann_2021, title={Impact of screening and relaxation on weakly coupled two-dimensional heterostructures}, volume={103}, DOI={10.1103/physrevb.103.l201408}, journal={Physical Review B}, author={Nguyen, T. T. Nhung and Sollfrank, T. and Tegenkamp, C. and Rauls, E. and Gerstmann, Uwe}, year={2021}, pages={L201408} }","mla":"Nguyen, T. T. Nhung, et al. “Impact of Screening and Relaxation on Weakly Coupled Two-Dimensional Heterostructures.” Physical Review B, vol. 103, 2021, p. L201408, doi:10.1103/physrevb.103.l201408.","short":"T.T.N. Nguyen, T. Sollfrank, C. Tegenkamp, E. Rauls, U. Gerstmann, Physical Review B 103 (2021) L201408."},"year":"2021","volume":103,"author":[{"full_name":"Nguyen, T. T. Nhung","last_name":"Nguyen","first_name":"T. T. Nhung"},{"first_name":"T.","last_name":"Sollfrank","full_name":"Sollfrank, T."},{"full_name":"Tegenkamp, C.","last_name":"Tegenkamp","first_name":"C."},{"first_name":"E.","full_name":"Rauls, E.","last_name":"Rauls"},{"id":"171","full_name":"Gerstmann, Uwe","orcid":"0000-0002-4476-223X","last_name":"Gerstmann","first_name":"Uwe"}],"date_created":"2021-07-29T07:09:50Z","date_updated":"2023-04-21T11:24:45Z","doi":"10.1103/physrevb.103.l201408","title":"Impact of screening and relaxation on weakly coupled two-dimensional heterostructures"},{"status":"public","publication":"Nature Chemistry","type":"journal_article","language":[{"iso":"eng"}],"_id":"24975","project":[{"name":"Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"230"},{"_id":"35"},{"_id":"790"}],"user_id":"16199","year":"2021","page":"828-835","citation":{"short":"M. Franz, S. Chandola, M. Koy, R. Zielinski, H. Aldahhak, M. Das, M. Freitag, U. Gerstmann, D. Liebig, A.K. Hoffmann, M. Rosin, W.G. Schmidt, C. Hogan, F. Glorius, N. Esser, M. Dähne, Nature Chemistry (2021) 828–835.","bibtex":"@article{Franz_Chandola_Koy_Zielinski_Aldahhak_Das_Freitag_Gerstmann_Liebig_Hoffmann_et al._2021, title={Controlled growth of ordered monolayers of N-heterocyclic carbenes on silicon}, DOI={10.1038/s41557-021-00721-2}, journal={Nature Chemistry}, author={Franz, Martin and Chandola, Sandhya and Koy, Maximilian and Zielinski, Robert and Aldahhak, Hazem and Das, Mowpriya and Freitag, Matthias and Gerstmann, Uwe and Liebig, Denise and Hoffmann, Adrian Karl and et al.}, year={2021}, pages={828–835} }","mla":"Franz, Martin, et al. “Controlled Growth of Ordered Monolayers of N-Heterocyclic Carbenes on Silicon.” Nature Chemistry, 2021, pp. 828–35, doi:10.1038/s41557-021-00721-2.","apa":"Franz, M., Chandola, S., Koy, M., Zielinski, R., Aldahhak, H., Das, M., Freitag, M., Gerstmann, U., Liebig, D., Hoffmann, A. K., Rosin, M., Schmidt, W. G., Hogan, C., Glorius, F., Esser, N., & Dähne, M. (2021). Controlled growth of ordered monolayers of N-heterocyclic carbenes on silicon. Nature Chemistry, 828–835. https://doi.org/10.1038/s41557-021-00721-2","ama":"Franz M, Chandola S, Koy M, et al. Controlled growth of ordered monolayers of N-heterocyclic carbenes on silicon. Nature Chemistry. Published online 2021:828-835. doi:10.1038/s41557-021-00721-2","chicago":"Franz, Martin, Sandhya Chandola, Maximilian Koy, Robert Zielinski, Hazem Aldahhak, Mowpriya Das, Matthias Freitag, et al. “Controlled Growth of Ordered Monolayers of N-Heterocyclic Carbenes on Silicon.” Nature Chemistry, 2021, 828–35. https://doi.org/10.1038/s41557-021-00721-2.","ieee":"M. Franz et al., “Controlled growth of ordered monolayers of N-heterocyclic carbenes on silicon,” Nature Chemistry, pp. 828–835, 2021, doi: 10.1038/s41557-021-00721-2."},"publication_identifier":{"issn":["1755-4330","1755-4349"]},"publication_status":"published","title":"Controlled growth of ordered monolayers of N-heterocyclic carbenes on silicon","doi":"10.1038/s41557-021-00721-2","date_updated":"2023-04-20T15:56:30Z","date_created":"2021-09-24T07:49:54Z","author":[{"full_name":"Franz, Martin","last_name":"Franz","first_name":"Martin"},{"first_name":"Sandhya","full_name":"Chandola, Sandhya","last_name":"Chandola"},{"first_name":"Maximilian","last_name":"Koy","full_name":"Koy, Maximilian"},{"first_name":"Robert","last_name":"Zielinski","full_name":"Zielinski, Robert"},{"full_name":"Aldahhak, Hazem","last_name":"Aldahhak","first_name":"Hazem"},{"full_name":"Das, Mowpriya","last_name":"Das","first_name":"Mowpriya"},{"first_name":"Matthias","last_name":"Freitag","full_name":"Freitag, Matthias"},{"full_name":"Gerstmann, Uwe","id":"171","last_name":"Gerstmann","orcid":"0000-0002-4476-223X","first_name":"Uwe"},{"first_name":"Denise","last_name":"Liebig","full_name":"Liebig, Denise"},{"last_name":"Hoffmann","full_name":"Hoffmann, Adrian Karl","first_name":"Adrian Karl"},{"first_name":"Maximilian","full_name":"Rosin, Maximilian","last_name":"Rosin"},{"first_name":"Wolf Gero","full_name":"Schmidt, Wolf Gero","id":"468","last_name":"Schmidt","orcid":"0000-0002-2717-5076"},{"last_name":"Hogan","full_name":"Hogan, Conor","first_name":"Conor"},{"first_name":"Frank","full_name":"Glorius, Frank","last_name":"Glorius"},{"first_name":"Norbert","last_name":"Esser","full_name":"Esser, Norbert"},{"full_name":"Dähne, Mario","last_name":"Dähne","first_name":"Mario"}]},{"publication_status":"published","publication_identifier":{"eissn":["2469-9969"],"issn":["2469-9950"]},"has_accepted_license":"1","citation":{"chicago":"Kozub, Agnieszka L., Arno Schindlmayr, Uwe Gerstmann, and Wolf Gero Schmidt. “Polaronic Enhancement of Second-Harmonic Generation in Lithium Niobate.” Physical Review B 104 (2021): 174110. https://doi.org/10.1103/PhysRevB.104.174110.","ieee":"A. L. Kozub, A. Schindlmayr, U. Gerstmann, and W. G. Schmidt, “Polaronic enhancement of second-harmonic generation in lithium niobate,” Physical Review B, vol. 104, p. 174110, 2021, doi: 10.1103/PhysRevB.104.174110.","ama":"Kozub AL, Schindlmayr A, Gerstmann U, Schmidt WG. Polaronic enhancement of second-harmonic generation in lithium niobate. Physical Review B. 2021;104:174110. doi:10.1103/PhysRevB.104.174110","bibtex":"@article{Kozub_Schindlmayr_Gerstmann_Schmidt_2021, title={Polaronic enhancement of second-harmonic generation in lithium niobate}, volume={104}, DOI={10.1103/PhysRevB.104.174110}, journal={Physical Review B}, publisher={American Physical Society}, author={Kozub, Agnieszka L. and Schindlmayr, Arno and Gerstmann, Uwe and Schmidt, Wolf Gero}, year={2021}, pages={174110} }","mla":"Kozub, Agnieszka L., et al. “Polaronic Enhancement of Second-Harmonic Generation in Lithium Niobate.” Physical Review B, vol. 104, American Physical Society, 2021, p. 174110, doi:10.1103/PhysRevB.104.174110.","short":"A.L. Kozub, A. Schindlmayr, U. Gerstmann, W.G. Schmidt, Physical Review B 104 (2021) 174110.","apa":"Kozub, A. L., Schindlmayr, A., Gerstmann, U., & Schmidt, W. G. (2021). Polaronic enhancement of second-harmonic generation in lithium niobate. Physical Review B, 104, 174110. https://doi.org/10.1103/PhysRevB.104.174110"},"page":"174110","intvolume":" 104","author":[{"orcid":"https://orcid.org/0000-0001-6584-0201","last_name":"Kozub","full_name":"Kozub, Agnieszka L.","id":"77566","first_name":"Agnieszka L."},{"full_name":"Schindlmayr, Arno","id":"458","orcid":"0000-0002-4855-071X","last_name":"Schindlmayr","first_name":"Arno"},{"first_name":"Uwe","id":"171","full_name":"Gerstmann, Uwe","last_name":"Gerstmann","orcid":"0000-0002-4476-223X"},{"last_name":"Schmidt","orcid":"0000-0002-2717-5076","full_name":"Schmidt, Wolf Gero","id":"468","first_name":"Wolf Gero"}],"volume":104,"oa":"1","date_updated":"2023-04-21T11:15:30Z","doi":"10.1103/PhysRevB.104.174110","type":"journal_article","status":"public","user_id":"171","department":[{"_id":"296"},{"_id":"230"},{"_id":"429"},{"_id":"295"},{"_id":"15"},{"_id":"170"},{"_id":"790"}],"project":[{"_id":"53","name":"TRR 142"},{"_id":"55","name":"TRR 142 - Project Area B"},{"name":"TRR 142 - Subproject B4","_id":"69"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"_id":"23418","file_date_updated":"2021-11-18T20:49:19Z","isi":"1","article_type":"original","quality_controlled":"1","year":"2021","date_created":"2021-08-16T19:09:46Z","publisher":"American Physical Society","title":"Polaronic enhancement of second-harmonic generation in lithium niobate","publication":"Physical Review B","file":[{"creator":"schindlm","file_size":804012,"file_name":"PhysRevB.104.174110.pdf","content_type":"application/pdf","date_updated":"2021-11-18T20:49:19Z","date_created":"2021-11-18T20:49:19Z","description":"© 2021 American Physical Society","title":"Polaronic enhancement of second-harmonic generation in lithium niobate","file_id":"27577","access_level":"open_access","relation":"main_file"}],"abstract":[{"text":"Density-functional theory within a Berry-phase formulation of the dynamical polarization is used to determine the second-order susceptibility χ(2) of lithium niobate (LiNbO3). Defect trapped polarons and bipolarons are found to strongly enhance the nonlinear susceptibility of the material, in particular if localized at NbV–VLi defect pairs. This is essentially a consequence of the polaronic excitation resulting in relaxation-induced gap states. The occupation of these levels leads to strongly enhanced χ(2) coefficients and allows for the spatial and transient modification of the second-harmonic generation of macroscopic samples.","lang":"eng"}],"external_id":{"isi":["000720931400007"],"arxiv":["2106.01145"]},"language":[{"iso":"eng"}],"ddc":["530"]}]