--- _id: '60565' article_number: '104103' author: - first_name: Adriana full_name: Bocchini, Adriana id: '58349' last_name: Bocchini orcid: 0000-0002-2134-3075 - first_name: Uwe full_name: Gerstmann, Uwe id: '171' last_name: Gerstmann orcid: 0000-0002-4476-223X - first_name: Wolf Gero full_name: Schmidt, Wolf Gero id: '468' last_name: Schmidt orcid: 0000-0002-2717-5076 citation: ama: Bocchini A, Gerstmann U, Schmidt WG. Microscopic origin of gray tracks in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>KTiOPO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>. Physical Review B. 2025;111(10). doi:10.1103/physrevb.111.104103 apa: Bocchini, A., Gerstmann, U., & Schmidt, W. G. (2025). Microscopic origin of gray tracks in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>KTiOPO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>. Physical Review B, 111(10), Article 104103. https://doi.org/10.1103/physrevb.111.104103 bibtex: '@article{Bocchini_Gerstmann_Schmidt_2025, title={Microscopic origin of gray tracks in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>KTiOPO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>}, volume={111}, DOI={10.1103/physrevb.111.104103}, number={10104103}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Bocchini, Adriana and Gerstmann, Uwe and Schmidt, Wolf Gero}, year={2025} }' chicago: Bocchini, Adriana, Uwe Gerstmann, and Wolf Gero Schmidt. “Microscopic Origin of Gray Tracks in <mml:Math Xmlns:Mml="http://Www.W3.Org/1998/Math/MathML"><mml:Msub><mml:Mi>KTiOPO</Mml:Mi><mml:Mn>4</Mml:Mn></Mml:Msub></Mml:Math>.” Physical Review B 111, no. 10 (2025). https://doi.org/10.1103/physrevb.111.104103. ieee: 'A. Bocchini, U. Gerstmann, and W. G. Schmidt, “Microscopic origin of gray tracks in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>KTiOPO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>,” Physical Review B, vol. 111, no. 10, Art. no. 104103, 2025, doi: 10.1103/physrevb.111.104103.' mla: Bocchini, Adriana, et al. “Microscopic Origin of Gray Tracks in <mml:Math Xmlns:Mml="http://Www.W3.Org/1998/Math/MathML"><mml:Msub><mml:Mi>KTiOPO</Mml:Mi><mml:Mn>4</Mml:Mn></Mml:Msub></Mml:Math>.” Physical Review B, vol. 111, no. 10, 104103, American Physical Society (APS), 2025, doi:10.1103/physrevb.111.104103. short: A. Bocchini, U. Gerstmann, W.G. Schmidt, Physical Review B 111 (2025). date_created: 2025-07-09T08:58:32Z date_updated: 2025-07-09T09:30:31Z department: - _id: '15' - _id: '295' - _id: '790' - _id: '230' - _id: '429' - _id: '35' - _id: '170' - _id: '27' doi: 10.1103/physrevb.111.104103 intvolume: ' 111' issue: '10' language: - iso: eng project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' - _id: '53' grant_number: '231447078' 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' - _id: '168' grant_number: '231447078' name: 'TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)' - _id: '166' name: 'TRR 142 - A11: TRR 142 - Subproject A11' publication: Physical Review B publication_identifier: issn: - 2469-9950 - 2469-9969 publication_status: published publisher: American Physical Society (APS) status: public title: Microscopic origin of gray tracks in KTiOPO4 type: journal_article user_id: '16199' volume: 111 year: '2025' ... --- _id: '60580' abstract: - lang: eng text: AbstractAlInP (001) is widely utilized as a window layer in optoelectronic devices, including world‐record III‐V multi‐junction solar cells and photoelectrochemical (PEC) cells. The chemical and electronic properties of AlInP (001) depend on its surface reconstruction, which impacts its interaction with electrolytes in PEC applications and passivation layers. This study investigates AlInP (001) surface reconstructions using density functional theory and experimental methods. Phosphorus‐rich (P‐rich) and indium‐rich (In‐rich) AlInP surfaces are prepared with in situ monitoring of the process by reflection anisotropy (RA) spectroscopy and confirmed by low‐energy electron diffraction and photoemission spectroscopy. The experimental RA spectra closely match the theoretical predictions obtained by solving the Bethe–Salpeter equation. It is shown that missing hydrogen on P‐rich surfaces and formation of In–In 1D atomic chains on In‐rich surfaces introduce mid‐gap surface states that pin the Fermi level and induce band bending. Time‐resolved two‐photon photoemission measurements reveal ultrafast near‐surface electron dynamics for both P‐rich and In‐rich surfaces, demonstrating photoexcited electrons reaching the surface conduction band minimum and relaxing to mid‐gap surface states on about hundreds of fs. This work provides the most extensive AlInP surface analysis to date, allowing for more targeted surface and interface engineering, which is crucial for the optimization and design of III‐V heterostructures. author: - first_name: Mohammad Amin full_name: Zare Pour, Mohammad Amin last_name: Zare Pour - first_name: Sahar full_name: Shekarabi, Sahar last_name: Shekarabi - first_name: Isaac Azahel full_name: Ruiz Alvarado, Isaac Azahel id: '79462' last_name: Ruiz Alvarado orcid: 0000-0002-4710-1170 - first_name: Jonathan full_name: Diederich, Jonathan last_name: Diederich - first_name: Yuyings full_name: Gao, Yuyings last_name: Gao - first_name: Agnieszka full_name: Paszuk, Agnieszka last_name: Paszuk - first_name: Dominik C. full_name: Moritz, Dominik C. last_name: Moritz - first_name: Wolfram full_name: Jaegermann, Wolfram last_name: Jaegermann - first_name: Dennis full_name: Friedrich, Dennis last_name: Friedrich - first_name: Roel full_name: van de Krol, Roel last_name: van de Krol - first_name: Wolf Gero full_name: Schmidt, Wolf Gero id: '468' last_name: Schmidt orcid: 0000-0002-2717-5076 - first_name: Thomas full_name: Hannappel, Thomas last_name: Hannappel citation: ama: 'Zare Pour MA, Shekarabi S, Ruiz Alvarado IA, et al. Exploring Electronic States and Ultrafast Electron Dynamics in AlInP Window Layers: The Role of Surface Reconstruction. Advanced Functional Materials. Published online 2025. doi:10.1002/adfm.202423702' apa: 'Zare Pour, M. A., Shekarabi, S., Ruiz Alvarado, I. A., Diederich, J., Gao, Y., Paszuk, A., Moritz, D. C., Jaegermann, W., Friedrich, D., van de Krol, R., Schmidt, W. G., & Hannappel, T. (2025). Exploring Electronic States and Ultrafast Electron Dynamics in AlInP Window Layers: The Role of Surface Reconstruction. Advanced Functional Materials. https://doi.org/10.1002/adfm.202423702' bibtex: '@article{Zare Pour_Shekarabi_Ruiz Alvarado_Diederich_Gao_Paszuk_Moritz_Jaegermann_Friedrich_van de Krol_et al._2025, title={Exploring Electronic States and Ultrafast Electron Dynamics in AlInP Window Layers: The Role of Surface Reconstruction}, DOI={10.1002/adfm.202423702}, journal={Advanced Functional Materials}, publisher={Wiley}, author={Zare Pour, Mohammad Amin and Shekarabi, Sahar and Ruiz Alvarado, Isaac Azahel and Diederich, Jonathan and Gao, Yuyings and Paszuk, Agnieszka and Moritz, Dominik C. and Jaegermann, Wolfram and Friedrich, Dennis and van de Krol, Roel and et al.}, year={2025} }' chicago: 'Zare Pour, Mohammad Amin, Sahar Shekarabi, Isaac Azahel Ruiz Alvarado, Jonathan Diederich, Yuyings Gao, Agnieszka Paszuk, Dominik C. Moritz, et al. “Exploring Electronic States and Ultrafast Electron Dynamics in AlInP Window Layers: The Role of Surface Reconstruction.” Advanced Functional Materials, 2025. https://doi.org/10.1002/adfm.202423702.' ieee: 'M. A. Zare Pour et al., “Exploring Electronic States and Ultrafast Electron Dynamics in AlInP Window Layers: The Role of Surface Reconstruction,” Advanced Functional Materials, 2025, doi: 10.1002/adfm.202423702.' mla: 'Zare Pour, Mohammad Amin, et al. “Exploring Electronic States and Ultrafast Electron Dynamics in AlInP Window Layers: The Role of Surface Reconstruction.” Advanced Functional Materials, Wiley, 2025, doi:10.1002/adfm.202423702.' short: M.A. Zare Pour, S. Shekarabi, I.A. Ruiz Alvarado, J. Diederich, Y. Gao, A. Paszuk, D.C. Moritz, W. Jaegermann, D. Friedrich, R. van de Krol, W.G. Schmidt, T. Hannappel, Advanced Functional Materials (2025). date_created: 2025-07-09T13:33:15Z date_updated: 2025-07-09T13:54:05Z department: - _id: '15' - _id: '170' - _id: '230' - _id: '27' - _id: '295' doi: 10.1002/adfm.202423702 language: - iso: eng publication: Advanced Functional Materials publication_identifier: issn: - 1616-301X - 1616-3028 publication_status: published publisher: Wiley status: public title: 'Exploring Electronic States and Ultrafast Electron Dynamics in AlInP Window Layers: The Role of Surface Reconstruction' type: journal_article user_id: '79462' year: '2025' ... --- _id: '58642' abstract: - lang: eng text: We present a cost-effective self-assembly method to fabricate low-density dimer NPs in an NPoM architecture, using the M13 phage as a spacer layer. This will enable the development of dynamic plasmonic devices and advanced sensing applications. article_type: original author: - first_name: Vasanthan full_name: Devaraj, Vasanthan id: '103814' last_name: Devaraj - first_name: Isaac Azahel full_name: Ruiz Alvarado, Isaac Azahel id: '79462' last_name: Ruiz Alvarado orcid: 0000-0002-4710-1170 - first_name: Jong-Min full_name: Lee, Jong-Min last_name: Lee - first_name: Jin-Woo full_name: Oh, Jin-Woo last_name: Oh - first_name: Uwe full_name: Gerstmann, Uwe id: '171' last_name: Gerstmann orcid: 0000-0002-4476-223X - first_name: Wolf Gero full_name: Schmidt, Wolf Gero id: '468' last_name: Schmidt orcid: 0000-0002-2717-5076 - first_name: Thomas full_name: Zentgraf, Thomas id: '30525' last_name: Zentgraf orcid: 0000-0002-8662-1101 citation: ama: Devaraj V, Ruiz Alvarado IA, Lee J-M, et al. Self-assembly of isolated plasmonic dimers with sub-5 nm gaps on a metallic mirror. Nanoscale Horizons. 2025;10:537-548. doi:10.1039/d4nh00546e apa: Devaraj, V., Ruiz Alvarado, I. A., Lee, J.-M., Oh, J.-W., Gerstmann, U., Schmidt, W. G., & Zentgraf, T. (2025). Self-assembly of isolated plasmonic dimers with sub-5 nm gaps on a metallic mirror. Nanoscale Horizons, 10, 537–548. https://doi.org/10.1039/d4nh00546e bibtex: '@article{Devaraj_Ruiz Alvarado_Lee_Oh_Gerstmann_Schmidt_Zentgraf_2025, title={Self-assembly of isolated plasmonic dimers with sub-5 nm gaps on a metallic mirror}, volume={10}, DOI={10.1039/d4nh00546e}, journal={Nanoscale Horizons}, publisher={Royal Society of Chemistry (RSC)}, author={Devaraj, Vasanthan and Ruiz Alvarado, Isaac Azahel and Lee, Jong-Min and Oh, Jin-Woo and Gerstmann, Uwe and Schmidt, Wolf Gero and Zentgraf, Thomas}, year={2025}, pages={537–548} }' chicago: 'Devaraj, Vasanthan, Isaac Azahel Ruiz Alvarado, Jong-Min Lee, Jin-Woo Oh, Uwe Gerstmann, Wolf Gero Schmidt, and Thomas Zentgraf. “Self-Assembly of Isolated Plasmonic Dimers with Sub-5 Nm Gaps on a Metallic Mirror.” Nanoscale Horizons 10 (2025): 537–48. https://doi.org/10.1039/d4nh00546e.' ieee: 'V. Devaraj et al., “Self-assembly of isolated plasmonic dimers with sub-5 nm gaps on a metallic mirror,” Nanoscale Horizons, vol. 10, pp. 537–548, 2025, doi: 10.1039/d4nh00546e.' mla: Devaraj, Vasanthan, et al. “Self-Assembly of Isolated Plasmonic Dimers with Sub-5 Nm Gaps on a Metallic Mirror.” Nanoscale Horizons, vol. 10, Royal Society of Chemistry (RSC), 2025, pp. 537–48, doi:10.1039/d4nh00546e. short: V. Devaraj, I.A. Ruiz Alvarado, J.-M. Lee, J.-W. Oh, U. Gerstmann, W.G. Schmidt, T. Zentgraf, Nanoscale Horizons 10 (2025) 537–548. date_created: 2025-02-14T08:13:10Z date_updated: 2025-07-09T14:04:39Z department: - _id: '15' - _id: '230' - _id: '289' - _id: '623' - _id: '35' - _id: '295' - _id: '170' - _id: '429' - _id: '27' doi: 10.1039/d4nh00546e intvolume: ' 10' language: - iso: eng page: 537-548 project: - _id: '53' grant_number: '231447078' name: 'TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen' - _id: '168' grant_number: '231447078' name: 'TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)' - _id: '55' name: 'TRR 142 - B: TRR 142 - Project Area B' - _id: '445' grant_number: '367360193' name: Hochleistungsrechner Noctua in Paderborn - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: Nanoscale Horizons publication_identifier: issn: - 2055-6756 - 2055-6764 publication_status: published publisher: Royal Society of Chemistry (RSC) quality_controlled: '1' status: public title: Self-assembly of isolated plasmonic dimers with sub-5 nm gaps on a metallic mirror type: journal_article user_id: '16199' volume: 10 year: '2025' ... --- _id: '60566' article_number: '074402' author: - first_name: Adriana full_name: Bocchini, Adriana id: '58349' last_name: Bocchini orcid: 0000-0002-2134-3075 - first_name: Michael full_name: Rüsing, Michael id: '22501' last_name: Rüsing orcid: 0000-0003-4682-4577 - first_name: Laura full_name: Bollmers, Laura id: '61375' last_name: Bollmers - first_name: Sebastian full_name: Lengeling, Sebastian id: '44373' last_name: Lengeling - first_name: Philipp full_name: Mues, Philipp id: '49772' last_name: Mues orcid: 0000-0003-0643-7636 - first_name: Laura full_name: Padberg, Laura id: '40300' last_name: Padberg - first_name: Uwe full_name: Gerstmann, Uwe id: '171' last_name: Gerstmann orcid: 0000-0002-4476-223X - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Wolf Gero full_name: Schmidt, Wolf Gero id: '468' last_name: Schmidt orcid: 0000-0002-2717-5076 citation: ama: 'Bocchini A, Rüsing M, Bollmers L, et al. Mg dopants in lithium niobate: Defect models and impact on domain inversion. Physical Review Materials. 2025;9(7). doi:10.1103/5wz1-bjyr' apa: 'Bocchini, A., Rüsing, M., Bollmers, L., Lengeling, S., Mues, P., Padberg, L., Gerstmann, U., Silberhorn, C., Eigner, C., & Schmidt, W. G. (2025). Mg dopants in lithium niobate: Defect models and impact on domain inversion. Physical Review Materials, 9(7), Article 074402. https://doi.org/10.1103/5wz1-bjyr' bibtex: '@article{Bocchini_Rüsing_Bollmers_Lengeling_Mues_Padberg_Gerstmann_Silberhorn_Eigner_Schmidt_2025, title={Mg dopants in lithium niobate: Defect models and impact on domain inversion}, volume={9}, DOI={10.1103/5wz1-bjyr}, number={7074402}, journal={Physical Review Materials}, publisher={American Physical Society (APS)}, author={Bocchini, Adriana and Rüsing, Michael and Bollmers, Laura and Lengeling, Sebastian and Mues, Philipp and Padberg, Laura and Gerstmann, Uwe and Silberhorn, Christine and Eigner, Christof and Schmidt, Wolf Gero}, year={2025} }' chicago: 'Bocchini, Adriana, Michael Rüsing, Laura Bollmers, Sebastian Lengeling, Philipp Mues, Laura Padberg, Uwe Gerstmann, Christine Silberhorn, Christof Eigner, and Wolf Gero Schmidt. “Mg Dopants in Lithium Niobate: Defect Models and Impact on Domain Inversion.” Physical Review Materials 9, no. 7 (2025). https://doi.org/10.1103/5wz1-bjyr.' ieee: 'A. Bocchini et al., “Mg dopants in lithium niobate: Defect models and impact on domain inversion,” Physical Review Materials, vol. 9, no. 7, Art. no. 074402, 2025, doi: 10.1103/5wz1-bjyr.' mla: 'Bocchini, Adriana, et al. “Mg Dopants in Lithium Niobate: Defect Models and Impact on Domain Inversion.” Physical Review Materials, vol. 9, no. 7, 074402, American Physical Society (APS), 2025, doi:10.1103/5wz1-bjyr.' short: A. Bocchini, M. Rüsing, L. Bollmers, S. Lengeling, P. Mues, L. Padberg, U. Gerstmann, C. Silberhorn, C. Eigner, W.G. Schmidt, Physical Review Materials 9 (2025). date_created: 2025-07-09T09:13:24Z date_updated: 2026-03-17T17:50:06Z ddc: - '530' department: - _id: '15' - _id: '623' - _id: '295' - _id: '790' - _id: '288' - _id: '230' - _id: '429' - _id: '35' - _id: '170' - _id: '169' - _id: '27' doi: 10.1103/5wz1-bjyr file: - access_level: open_access content_type: application/pdf creator: adrianab date_created: 2025-07-09T09:18:45Z date_updated: 2025-07-10T06:43:34Z file_id: '60567' file_name: Mg_dopants_LN_PRM.pdf file_size: 4175120 relation: main_file file_date_updated: 2025-07-10T06:43:34Z has_accepted_license: '1' intvolume: ' 9' issue: '7' language: - iso: eng main_file_link: - open_access: '1' url: https://link.aps.org/doi/10.1103/5wz1-bjyr oa: '1' project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' - _id: '53' name: 'TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen' - _id: '55' name: 'TRR 142 - B: TRR 142 - Project Area B' - _id: '54' name: 'TRR 142 - A: TRR 142 - Project Area A' - _id: '168' name: 'TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)' - _id: '166' name: 'TRR 142 - A11: TRR 142 - Subproject A11' publication: Physical Review Materials publication_identifier: issn: - 2475-9953 publication_status: published publisher: American Physical Society (APS) status: public title: 'Mg dopants in lithium niobate: Defect models and impact on domain inversion' type: journal_article user_id: '22501' volume: 9 year: '2025' ... --- _id: '65102' abstract: - lang: eng text: 'Efficient graph processing is essential for a wide range of applications. Scalability and memory access patterns are still a challenge, especially with the Breadth-First Search algorithm. This work focuses on leveraging HPC systems with multiple GPUs available in a single node with peer-to-peer functionality of the Intel oneAPI implementation of SYCL. We propose three GPU-based load-balancing methods: work-group localisation for efficient data access, even workload distribution for higher GPU occupancy, and a hybrid strided-access approach for heuristic balancing. These methods ensure performance, portability, and productivity with a unified codebase. Our proposed methodologies outperform state-of-the-art single-GPU implementations based on CUDA on synthetic RMAT graphs. We analysed BFS performance across NVIDIA A100, Intel Max 1550, and AMD MI300X GPUs, achieving a peak performance of 153.27 GTEPS on an RMAT25-64 graph using 8 GPUs on the NVIDIA A100. Furthermore, our work demonstrates the capability to handle RMAT graphs up to scale 29, achieving superior performance on synthetic graphs and competitive results on real-world datasets.' author: - first_name: Kaan full_name: Olgu, Kaan last_name: Olgu - first_name: Tobias full_name: Kenter, Tobias id: '3145' last_name: Kenter - first_name: Jose full_name: Nunez-Yanez, Jose last_name: Nunez-Yanez - first_name: Simon full_name: McIntosh-Smith, Simon last_name: McIntosh-Smith - first_name: Tom full_name: Deakin, Tom last_name: Deakin citation: ama: 'Olgu K, Kenter T, Nunez-Yanez J, McIntosh-Smith S, Deakin T. Towards Efficient Load Balancing BFS on GPUs: One Code for AMD, Intel & Nvidia. In: Proceedings of the SC ’25 Workshops of the International Conference for High Performance Computing, Networking, Storage and Analysis. ACM; 2025. doi:10.1145/3731599.3767570' apa: 'Olgu, K., Kenter, T., Nunez-Yanez, J., McIntosh-Smith, S., & Deakin, T. (2025). Towards Efficient Load Balancing BFS on GPUs: One Code for AMD, Intel & Nvidia. Proceedings of the SC ’25 Workshops of the International Conference for High Performance Computing, Networking, Storage and Analysis. https://doi.org/10.1145/3731599.3767570' bibtex: '@inproceedings{Olgu_Kenter_Nunez-Yanez_McIntosh-Smith_Deakin_2025, title={Towards Efficient Load Balancing BFS on GPUs: One Code for AMD, Intel & Nvidia}, DOI={10.1145/3731599.3767570}, booktitle={Proceedings of the SC ’25 Workshops of the International Conference for High Performance Computing, Networking, Storage and Analysis}, publisher={ACM}, author={Olgu, Kaan and Kenter, Tobias and Nunez-Yanez, Jose and McIntosh-Smith, Simon and Deakin, Tom}, year={2025} }' chicago: 'Olgu, Kaan, Tobias Kenter, Jose Nunez-Yanez, Simon McIntosh-Smith, and Tom Deakin. “Towards Efficient Load Balancing BFS on GPUs: One Code for AMD, Intel & Nvidia.” In Proceedings of the SC ’25 Workshops of the International Conference for High Performance Computing, Networking, Storage and Analysis. ACM, 2025. https://doi.org/10.1145/3731599.3767570.' ieee: 'K. Olgu, T. Kenter, J. Nunez-Yanez, S. McIntosh-Smith, and T. Deakin, “Towards Efficient Load Balancing BFS on GPUs: One Code for AMD, Intel & Nvidia,” 2025, doi: 10.1145/3731599.3767570.' mla: 'Olgu, Kaan, et al. “Towards Efficient Load Balancing BFS on GPUs: One Code for AMD, Intel & Nvidia.” Proceedings of the SC ’25 Workshops of the International Conference for High Performance Computing, Networking, Storage and Analysis, ACM, 2025, doi:10.1145/3731599.3767570.' short: 'K. Olgu, T. Kenter, J. Nunez-Yanez, S. McIntosh-Smith, T. Deakin, in: Proceedings of the SC ’25 Workshops of the International Conference for High Performance Computing, Networking, Storage and Analysis, ACM, 2025.' date_created: 2026-03-24T09:05:22Z date_updated: 2026-03-24T09:06:33Z department: - _id: '27' - _id: '518' doi: 10.1145/3731599.3767570 language: - iso: eng project: - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: Proceedings of the SC '25 Workshops of the International Conference for High Performance Computing, Networking, Storage and Analysis publication_status: published publisher: ACM status: public title: 'Towards Efficient Load Balancing BFS on GPUs: One Code for AMD, Intel & Nvidia' type: conference user_id: '3145' year: '2025' ... --- _id: '62981' abstract: - lang: eng text: "Otus is a high-performance computing cluster that was launched in 2025 and is operated by the Paderborn Center for Parallel Computing (PC2) at Paderborn University in Germany. The system is part of the National High Performance Computing (NHR) initiative. Otus complements the previous supercomputer Noctua 2, offering approximately twice the computing power while retaining the three node types that were characteristic of Noctua 2: 1) CPU compute nodes with different memory capacities, 2) high-end GPU nodes, and 3) HPC-grade FPGA nodes. On the Top500 list, which ranks the 500 most powerful supercomputers in the world, Otus is in position 164 with the CPU partition and in position 255 with the GPU partition (June 2025). On the Green500 list, ranking the 500 most energy-efficient supercomputers in the world, Otus is in position 5 with the GPU partition (June 2025).\r\n\r\n\r\nThis article provides a comprehensive overview of the system in terms of its hardware, software, system integration, and its overall integration into the data center building to ensure energy-efficient operation. The article aims to provide unique insights for scientists using the system and for other centers operating HPC clusters. The article will be continuously updated to reflect the latest system setup and measurements. " author: - first_name: Sadaf full_name: Ehtesabi, Sadaf id: '116116' last_name: Ehtesabi - first_name: Manoar full_name: Hossain, Manoar id: '114619' last_name: Hossain orcid: https://orcid.org/0000-0002-0737-7981 - first_name: Tobias full_name: Kenter, Tobias id: '3145' last_name: Kenter - first_name: Andreas full_name: Krawinkel, Andreas id: '15275' last_name: Krawinkel - first_name: Lukas full_name: Ostermann, Lukas id: '69976' last_name: Ostermann - first_name: Christian full_name: Plessl, Christian id: '16153' last_name: Plessl orcid: 0000-0001-5728-9982 - first_name: Heinrich full_name: Riebler, Heinrich id: '8961' last_name: Riebler - first_name: Stefan full_name: Rohde, Stefan id: '34009' last_name: Rohde - first_name: Robert full_name: Schade, Robert id: '75963' last_name: Schade orcid: 0000-0002-6268-5397 - first_name: Michael full_name: Schwarz, Michael id: '5312' last_name: Schwarz - first_name: Jens full_name: Simon, Jens id: '15273' last_name: Simon - first_name: Nils full_name: Winnwa, Nils id: '61189' last_name: Winnwa - first_name: Alex full_name: Wiens, Alex id: '23522' last_name: Wiens orcid: 0000-0003-1764-9773 - first_name: Xin full_name: Wu, Xin id: '77439' last_name: Wu citation: ama: Ehtesabi S, Hossain M, Kenter T, et al. Otus Supercomputer. Vol 1. Paderborn Center for Parallel Computing (PC2); 2025. doi:10.48550/ARXIV.2512.07401 apa: Ehtesabi, S., Hossain, M., Kenter, T., Krawinkel, A., Ostermann, L., Plessl, C., Riebler, H., Rohde, S., Schade, R., Schwarz, M., Simon, J., Winnwa, N., Wiens, A., & Wu, X. (2025). Otus Supercomputer (Vol. 1). Paderborn Center for Parallel Computing (PC2). https://doi.org/10.48550/ARXIV.2512.07401 bibtex: '@book{Ehtesabi_Hossain_Kenter_Krawinkel_Ostermann_Plessl_Riebler_Rohde_Schade_Schwarz_et al._2025, place={Paderborn}, series={PC2 Tech­nic­al Re­port Series}, title={Otus Supercomputer}, volume={1}, DOI={10.48550/ARXIV.2512.07401}, publisher={Paderborn Center for Parallel Computing (PC2)}, author={Ehtesabi, Sadaf and Hossain, Manoar and Kenter, Tobias and Krawinkel, Andreas and Ostermann, Lukas and Plessl, Christian and Riebler, Heinrich and Rohde, Stefan and Schade, Robert and Schwarz, Michael and et al.}, year={2025}, collection={PC2 Tech­nic­al Re­port Series} }' chicago: 'Ehtesabi, Sadaf, Manoar Hossain, Tobias Kenter, Andreas Krawinkel, Lukas Ostermann, Christian Plessl, Heinrich Riebler, et al. Otus Supercomputer. Vol. 1. PC2 Tech­nic­al Re­port Series. Paderborn: Paderborn Center for Parallel Computing (PC2), 2025. https://doi.org/10.48550/ARXIV.2512.07401.' ieee: 'S. Ehtesabi et al., Otus Supercomputer, vol. 1. Paderborn: Paderborn Center for Parallel Computing (PC2), 2025.' mla: Ehtesabi, Sadaf, et al. Otus Supercomputer. Paderborn Center for Parallel Computing (PC2), 2025, doi:10.48550/ARXIV.2512.07401. short: S. Ehtesabi, M. Hossain, T. Kenter, A. Krawinkel, L. Ostermann, C. Plessl, H. Riebler, S. Rohde, R. Schade, M. Schwarz, J. Simon, N. Winnwa, A. Wiens, X. Wu, Otus Supercomputer, Paderborn Center for Parallel Computing (PC2), Paderborn, 2025. date_created: 2025-12-09T09:11:04Z date_updated: 2026-03-25T11:50:31Z ddc: - '004' department: - _id: '27' - _id: '518' doi: 10.48550/ARXIV.2512.07401 file: - access_level: open_access content_type: application/pdf creator: deffel date_created: 2025-12-09T09:19:12Z date_updated: 2026-03-25T11:50:30Z file_id: '62982' file_name: 2512.07401v1.pdf file_size: 4535595 relation: main_file file_date_updated: 2026-03-25T11:50:30Z has_accepted_license: '1' intvolume: ' 1' keyword: - Otus - Supercomputer - FPGA - PC2 - Paderborn Center for Parallel Computing - Noctua 2 - HPC language: - iso: eng oa: '1' page: '33' place: Paderborn publication_status: published publisher: Paderborn Center for Parallel Computing (PC2) report_number: PC2TR-2025-1 series_title: PC2 Tech­nic­al Re­port Series status: public title: Otus Supercomputer type: report user_id: '23522' volume: 1 year: '2025' ... --- _id: '59816' author: - first_name: Gerrit full_name: Pape, Gerrit last_name: Pape - first_name: Bjarne full_name: Wintermann, Bjarne id: '62900' last_name: Wintermann orcid: 0009-0000-0856-6250 - first_name: Linus full_name: Jungemann, Linus id: '67601' last_name: Jungemann orcid: 0009-0003-9757-988X - first_name: Michael full_name: Lass, Michael last_name: Lass - first_name: Marius full_name: Meyer, Marius last_name: Meyer - first_name: Heinrich full_name: Riebler, Heinrich id: '8961' last_name: Riebler - first_name: Christian full_name: Plessl, Christian id: '16153' last_name: Plessl orcid: 0000-0001-5728-9982 citation: ama: 'Pape G, Wintermann B, Jungemann L, et al. AuroraFlow, an Easy-to-Use, Low-Latency FPGA Communication Solution Demonstrated on Multi-FPGA Neural Network Inference. In: Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies. ; 2025. doi:10.1145/3728179.3728190' apa: Pape, G., Wintermann, B., Jungemann, L., Lass, M., Meyer, M., Riebler, H., & Plessl, C. (2025). AuroraFlow, an Easy-to-Use, Low-Latency FPGA Communication Solution Demonstrated on Multi-FPGA Neural Network Inference. Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies. The International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies 2025 (HEART 2025) , Kumamoto, Japan. https://doi.org/10.1145/3728179.3728190 bibtex: '@inproceedings{Pape_Wintermann_Jungemann_Lass_Meyer_Riebler_Plessl_2025, title={AuroraFlow, an Easy-to-Use, Low-Latency FPGA Communication Solution Demonstrated on Multi-FPGA Neural Network Inference}, DOI={10.1145/3728179.3728190}, booktitle={Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies}, author={Pape, Gerrit and Wintermann, Bjarne and Jungemann, Linus and Lass, Michael and Meyer, Marius and Riebler, Heinrich and Plessl, Christian}, year={2025} }' chicago: Pape, Gerrit, Bjarne Wintermann, Linus Jungemann, Michael Lass, Marius Meyer, Heinrich Riebler, and Christian Plessl. “AuroraFlow, an Easy-to-Use, Low-Latency FPGA Communication Solution Demonstrated on Multi-FPGA Neural Network Inference.” In Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies, 2025. https://doi.org/10.1145/3728179.3728190. ieee: 'G. Pape et al., “AuroraFlow, an Easy-to-Use, Low-Latency FPGA Communication Solution Demonstrated on Multi-FPGA Neural Network Inference,” presented at the The International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies 2025 (HEART 2025) , Kumamoto, Japan, 2025, doi: 10.1145/3728179.3728190.' mla: Pape, Gerrit, et al. “AuroraFlow, an Easy-to-Use, Low-Latency FPGA Communication Solution Demonstrated on Multi-FPGA Neural Network Inference.” Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies, 2025, doi:10.1145/3728179.3728190. short: 'G. Pape, B. Wintermann, L. Jungemann, M. Lass, M. Meyer, H. Riebler, C. Plessl, in: Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies, 2025.' conference: end_date: 2025-05-28 location: Kumamoto, Japan name: 'The International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies 2025 (HEART 2025) ' start_date: 2025-05-26 date_created: 2025-05-06T09:53:41Z date_updated: 2026-05-13T09:46:42Z department: - _id: '27' doi: 10.1145/3728179.3728190 language: - iso: eng main_file_link: - open_access: '1' oa: '1' project: - _id: '296' name: 'EKI-App: EKI-App: Energieeffiziente Künstliche Intelligenz im Rechenzentrum durch Approximation von tiefen neuronalen Netzen für Field-Programmable Gate Arrays' publication: Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies publication_status: published status: public title: AuroraFlow, an Easy-to-Use, Low-Latency FPGA Communication Solution Demonstrated on Multi-FPGA Neural Network Inference type: conference user_id: '16153' year: '2025' ... --- _id: '65618' author: - first_name: Mika full_name: Bröker, Mika last_name: Bröker - first_name: Johannes full_name: Menzel, Johannes last_name: Menzel - first_name: Christian full_name: Plessl, Christian id: '16153' last_name: Plessl orcid: 0000-0001-5728-9982 citation: ama: 'Bröker M, Menzel J, Plessl C. Evaluating the Strong Scaling Potential of AI Engines for Molecular Dynamics Simulations. In: Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies. ACM; 2025. doi:10.1145/3728179.3728187' apa: Bröker, M., Menzel, J., & Plessl, C. (2025). Evaluating the Strong Scaling Potential of AI Engines for Molecular Dynamics Simulations. Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies. https://doi.org/10.1145/3728179.3728187 bibtex: '@inproceedings{Bröker_Menzel_Plessl_2025, title={Evaluating the Strong Scaling Potential of AI Engines for Molecular Dynamics Simulations}, DOI={10.1145/3728179.3728187}, booktitle={Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies}, publisher={ACM}, author={Bröker, Mika and Menzel, Johannes and Plessl, Christian}, year={2025} }' chicago: Bröker, Mika, Johannes Menzel, and Christian Plessl. “Evaluating the Strong Scaling Potential of AI Engines for Molecular Dynamics Simulations.” In Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies. ACM, 2025. https://doi.org/10.1145/3728179.3728187. ieee: 'M. Bröker, J. Menzel, and C. Plessl, “Evaluating the Strong Scaling Potential of AI Engines for Molecular Dynamics Simulations,” 2025, doi: 10.1145/3728179.3728187.' mla: Bröker, Mika, et al. “Evaluating the Strong Scaling Potential of AI Engines for Molecular Dynamics Simulations.” Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies, ACM, 2025, doi:10.1145/3728179.3728187. short: 'M. Bröker, J. Menzel, C. Plessl, in: Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies, ACM, 2025.' date_created: 2026-05-13T09:44:21Z date_updated: 2026-05-13T09:45:17Z department: - _id: '27' - _id: '518' doi: 10.1145/3728179.3728187 language: - iso: eng main_file_link: - open_access: '1' oa: '1' publication: Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies publication_status: published publisher: ACM status: public title: Evaluating the Strong Scaling Potential of AI Engines for Molecular Dynamics Simulations type: conference user_id: '16153' year: '2025' ... --- _id: '53474' abstract: - lang: eng text: We present a novel approach to characterize and quantify microheterogeneity and microphase separation in computer simulations of complex liquid mixtures. Our post-processing method is based on local density fluctuations of the different constituents in sampling spheres of varying size. It can be easily applied to both molecular dynamics (MD) and Monte Carlo (MC) simulations, including periodic boundary conditions. Multidimensional correlation of the density distributions yields a clear picture of the domain formation due to the subtle balance of different interactions. We apply our approach to the example of force field molecular dynamics simulations of imidazolium-based ionic liquids with different side chain lengths at different temperatures, namely 1-ethyl-3-methylimidazolium chloride, 1-hexyl-3-methylimidazolium chloride, and 1-decyl-3-methylimidazolium chloride, which are known to form distinct liquid domains. We put the results into the context of existing microheterogeneity analyses and demonstrate the advantages and sensitivity of our novel method. Furthermore, we show how to estimate the configuration entropy from our analysis, and we investigate voids in the system. The analysis has been implemented into our program package TRAVIS and is thus available as free software. article_number: '322' author: - first_name: Michael full_name: Lass, Michael id: '24135' last_name: Lass orcid: 0000-0002-5708-7632 - first_name: Tobias full_name: Kenter, Tobias id: '3145' last_name: Kenter - first_name: Christian full_name: Plessl, Christian id: '16153' last_name: Plessl orcid: 0000-0001-5728-9982 - first_name: Martin full_name: Brehm, Martin id: '100167' last_name: Brehm citation: ama: Lass M, Kenter T, Plessl C, Brehm M. Characterizing Microheterogeneity in Liquid Mixtures via Local Density Fluctuations. Entropy. 2024;26(4). doi:10.3390/e26040322 apa: Lass, M., Kenter, T., Plessl, C., & Brehm, M. (2024). Characterizing Microheterogeneity in Liquid Mixtures via Local Density Fluctuations. Entropy, 26(4), Article 322. https://doi.org/10.3390/e26040322 bibtex: '@article{Lass_Kenter_Plessl_Brehm_2024, title={Characterizing Microheterogeneity in Liquid Mixtures via Local Density Fluctuations}, volume={26}, DOI={10.3390/e26040322}, number={4322}, journal={Entropy}, publisher={MDPI AG}, author={Lass, Michael and Kenter, Tobias and Plessl, Christian and Brehm, Martin}, year={2024} }' chicago: Lass, Michael, Tobias Kenter, Christian Plessl, and Martin Brehm. “Characterizing Microheterogeneity in Liquid Mixtures via Local Density Fluctuations.” Entropy 26, no. 4 (2024). https://doi.org/10.3390/e26040322. ieee: 'M. Lass, T. Kenter, C. Plessl, and M. Brehm, “Characterizing Microheterogeneity in Liquid Mixtures via Local Density Fluctuations,” Entropy, vol. 26, no. 4, Art. no. 322, 2024, doi: 10.3390/e26040322.' mla: Lass, Michael, et al. “Characterizing Microheterogeneity in Liquid Mixtures via Local Density Fluctuations.” Entropy, vol. 26, no. 4, 322, MDPI AG, 2024, doi:10.3390/e26040322. short: M. Lass, T. Kenter, C. Plessl, M. Brehm, Entropy 26 (2024). date_created: 2024-04-12T18:31:39Z date_updated: 2024-04-12T18:34:32Z department: - _id: '27' - _id: '518' - _id: '803' doi: 10.3390/e26040322 intvolume: ' 26' issue: '4' language: - iso: eng project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: Entropy publication_identifier: issn: - 1099-4300 publication_status: published publisher: MDPI AG status: public title: Characterizing Microheterogeneity in Liquid Mixtures via Local Density Fluctuations type: journal_article user_id: '24135' volume: 26 year: '2024' ... --- _id: '53663' abstract: - lang: eng text: 'Noctua 2 is a supercomputer operated at the Paderborn Center for Parallel Computing (PC2) at Paderborn University in Germany. Noctua 2 was inaugurated in 2022 and is an Atos BullSequana XH2000 system. It consists mainly of three node types: 1) CPU Compute nodes with AMD EPYC processors in different main memory configurations, 2) GPU nodes with NVIDIA A100 GPUs, and 3) FPGA nodes with Xilinx Alveo U280 and Intel Stratix 10 FPGA cards. While CPUs and GPUs are known off-the-shelf components in HPC systems, the operation of a large number of FPGA cards from different vendors and a dedicated FPGA-to-FPGA network are unique characteristics of Noctua 2. This paper describes in detail the overall setup of Noctua 2 and gives insights into the operation of the cluster from a hardware, software and facility perspective.' article_type: original author: - first_name: Carsten full_name: Bauer, Carsten id: '90082' last_name: Bauer - first_name: Tobias full_name: Kenter, Tobias id: '3145' last_name: Kenter - first_name: Michael full_name: Lass, Michael id: '24135' last_name: Lass orcid: 0000-0002-5708-7632 - first_name: Lukas full_name: Mazur, Lukas id: '90492' last_name: Mazur orcid: ' 0000-0001-6304-7082' - first_name: Marius full_name: Meyer, Marius id: '40778' last_name: Meyer - first_name: Holger full_name: Nitsche, Holger id: '15272' last_name: Nitsche - first_name: Heinrich full_name: Riebler, Heinrich id: '8961' last_name: Riebler - first_name: Robert full_name: Schade, Robert id: '75963' last_name: Schade orcid: 0000-0002-6268-5397 - first_name: Michael full_name: Schwarz, Michael id: '5312' last_name: Schwarz - first_name: Nils full_name: Winnwa, Nils id: '61189' last_name: Winnwa - first_name: Alex full_name: Wiens, Alex id: '23522' last_name: Wiens orcid: 0000-0003-1764-9773 - first_name: Xin full_name: Wu, Xin id: '77439' last_name: Wu - first_name: Christian full_name: Plessl, Christian id: '16153' last_name: Plessl orcid: 0000-0001-5728-9982 - first_name: Jens full_name: Simon, Jens id: '15273' last_name: Simon citation: ama: Bauer C, Kenter T, Lass M, et al. Noctua 2 Supercomputer. Journal of large-scale research facilities. 2024;9. doi:10.17815/jlsrf-8-187 apa: Bauer, C., Kenter, T., Lass, M., Mazur, L., Meyer, M., Nitsche, H., Riebler, H., Schade, R., Schwarz, M., Winnwa, N., Wiens, A., Wu, X., Plessl, C., & Simon, J. (2024). Noctua 2 Supercomputer. Journal of Large-Scale Research Facilities, 9. https://doi.org/10.17815/jlsrf-8-187 bibtex: '@article{Bauer_Kenter_Lass_Mazur_Meyer_Nitsche_Riebler_Schade_Schwarz_Winnwa_et al._2024, title={Noctua 2 Supercomputer}, volume={9}, DOI={10.17815/jlsrf-8-187 }, journal={Journal of large-scale research facilities}, author={Bauer, Carsten and Kenter, Tobias and Lass, Michael and Mazur, Lukas and Meyer, Marius and Nitsche, Holger and Riebler, Heinrich and Schade, Robert and Schwarz, Michael and Winnwa, Nils and et al.}, year={2024} }' chicago: Bauer, Carsten, Tobias Kenter, Michael Lass, Lukas Mazur, Marius Meyer, Holger Nitsche, Heinrich Riebler, et al. “Noctua 2 Supercomputer.” Journal of Large-Scale Research Facilities 9 (2024). https://doi.org/10.17815/jlsrf-8-187 . ieee: 'C. Bauer et al., “Noctua 2 Supercomputer,” Journal of large-scale research facilities, vol. 9, 2024, doi: 10.17815/jlsrf-8-187 .' mla: Bauer, Carsten, et al. “Noctua 2 Supercomputer.” Journal of Large-Scale Research Facilities, vol. 9, 2024, doi:10.17815/jlsrf-8-187 . short: C. Bauer, T. Kenter, M. Lass, L. Mazur, M. Meyer, H. Nitsche, H. Riebler, R. Schade, M. Schwarz, N. Winnwa, A. Wiens, X. Wu, C. Plessl, J. Simon, Journal of Large-Scale Research Facilities 9 (2024). date_created: 2024-04-26T07:39:41Z date_updated: 2024-04-26T08:44:30Z ddc: - '004' department: - _id: '27' - _id: '518' doi: '10.17815/jlsrf-8-187 ' file: - access_level: open_access content_type: application/pdf creator: deffel date_created: 2024-04-26T07:30:20Z date_updated: 2024-04-26T08:35:17Z file_id: '53664' file_name: Noctua2_Supercomputer.pdf file_size: 3825480 relation: main_file file_date_updated: 2024-04-26T08:35:17Z has_accepted_license: '1' intvolume: ' 9' keyword: - Noctua 2 - Supercomputer - FPGA - PC2 - Paderborn Center for Parallel Computing language: - iso: eng oa: '1' project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: Journal of large-scale research facilities publication_status: published status: public title: Noctua 2 Supercomputer type: journal_article user_id: '8961' volume: 9 year: '2024' ... --- _id: '55267' article_number: '075301' author: - first_name: F. full_name: Schäfer, F. last_name: Schäfer - first_name: A. full_name: Trautmann, A. last_name: Trautmann - first_name: C. full_name: Ngo, C. last_name: Ngo - first_name: J. T. full_name: Steiner, J. T. last_name: Steiner - first_name: C. full_name: Fuchs, C. last_name: Fuchs - first_name: K. full_name: Volz, K. last_name: Volz - first_name: F. full_name: Dobener, F. last_name: Dobener - first_name: M. full_name: Stein, M. last_name: Stein - first_name: Torsten full_name: Meier, Torsten id: '344' last_name: Meier orcid: 0000-0001-8864-2072 - first_name: S. full_name: Chatterjee, S. last_name: Chatterjee citation: ama: Schäfer F, Trautmann A, Ngo C, et al. Optical Stark effect in type-II semiconductor heterostructures. Physical Review B. 2024;109(7). doi:10.1103/physrevb.109.075301 apa: Schäfer, F., Trautmann, A., Ngo, C., Steiner, J. T., Fuchs, C., Volz, K., Dobener, F., Stein, M., Meier, T., & Chatterjee, S. (2024). Optical Stark effect in type-II semiconductor heterostructures. Physical Review B, 109(7), Article 075301. https://doi.org/10.1103/physrevb.109.075301 bibtex: '@article{Schäfer_Trautmann_Ngo_Steiner_Fuchs_Volz_Dobener_Stein_Meier_Chatterjee_2024, title={Optical Stark effect in type-II semiconductor heterostructures}, volume={109}, DOI={10.1103/physrevb.109.075301}, number={7075301}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Schäfer, F. and Trautmann, A. and Ngo, C. and Steiner, J. T. and Fuchs, C. and Volz, K. and Dobener, F. and Stein, M. and Meier, Torsten and Chatterjee, S.}, year={2024} }' chicago: Schäfer, F., A. Trautmann, C. Ngo, J. T. Steiner, C. Fuchs, K. Volz, F. Dobener, M. Stein, Torsten Meier, and S. Chatterjee. “Optical Stark Effect in Type-II Semiconductor Heterostructures.” Physical Review B 109, no. 7 (2024). https://doi.org/10.1103/physrevb.109.075301. ieee: 'F. Schäfer et al., “Optical Stark effect in type-II semiconductor heterostructures,” Physical Review B, vol. 109, no. 7, Art. no. 075301, 2024, doi: 10.1103/physrevb.109.075301.' mla: Schäfer, F., et al. “Optical Stark Effect in Type-II Semiconductor Heterostructures.” Physical Review B, vol. 109, no. 7, 075301, American Physical Society (APS), 2024, doi:10.1103/physrevb.109.075301. short: F. Schäfer, A. Trautmann, C. Ngo, J.T. Steiner, C. Fuchs, K. Volz, F. Dobener, M. Stein, T. Meier, S. Chatterjee, Physical Review B 109 (2024). date_created: 2024-07-15T09:47:27Z date_updated: 2024-07-15T09:49:41Z department: - _id: '15' - _id: '170' - _id: '293' - _id: '35' - _id: '230' - _id: '429' - _id: '27' doi: 10.1103/physrevb.109.075301 intvolume: ' 109' issue: '7' language: - iso: eng project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' - _id: '53' grant_number: '231447078' name: 'TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen' - _id: '165' grant_number: '231447078' name: 'TRR 142 - A10: TRR 142 - Nichtlinearitäten von atomar dünnen Übergangsmetall-Dichalkogeniden in starken Feldern (A10)' publication: Physical Review B publication_identifier: issn: - 2469-9950 - 2469-9969 publication_status: published publisher: American Physical Society (APS) status: public title: Optical Stark effect in type-II semiconductor heterostructures type: journal_article user_id: '16199' volume: 109 year: '2024' ... --- _id: '56606' abstract: - lang: eng text: AbstractMost FPGA boards in the HPC domain are well-suited for parallel scaling because of the direct integration of versatile and high-throughput network ports. However, the utilization of their network capabilities is often challenging and error-prone because the whole network stack and communication patterns have to be implemented and managed on the FPGAs. Also, this approach conceptually involves a trade-off between the performance potential of improved communication and the impact of resource consumption for communication infrastructure, since the utilized resources on the FPGAs could otherwise be used for computations. In this work, we investigate this trade-off, firstly, by using synthetic benchmarks to evaluate the different configuration options of the communication framework ACCL and their impact on communication latency and throughput. Finally, we use our findings to implement a shallow water simulation whose scalability heavily depends on low-latency communication. With a suitable configuration of ACCL, good scaling behavior can be shown to all 48 FPGAs installed in the system. Overall, the results show that the availability of inter-FPGA communication frameworks as well as the configurability of framework and network stack are crucial to achieve the best application performance with low latency communication. author: - first_name: Marius full_name: Meyer, Marius last_name: Meyer - first_name: Tobias full_name: Kenter, Tobias last_name: Kenter - first_name: Lucian full_name: Petrica, Lucian last_name: Petrica - first_name: Kenneth full_name: O’Brien, Kenneth last_name: O’Brien - first_name: Michaela full_name: Blott, Michaela last_name: Blott - first_name: Christian full_name: Plessl, Christian last_name: Plessl citation: ama: 'Meyer M, Kenter T, Petrica L, O’Brien K, Blott M, Plessl C. Optimizing Communication for Latency Sensitive HPC Applications on up to 48 FPGAs Using ACCL. In: Lecture Notes in Computer Science. Springer Nature Switzerland; 2024. doi:10.1007/978-3-031-69766-1_9' apa: Meyer, M., Kenter, T., Petrica, L., O’Brien, K., Blott, M., & Plessl, C. (2024). Optimizing Communication for Latency Sensitive HPC Applications on up to 48 FPGAs Using ACCL. In Lecture Notes in Computer Science. Springer Nature Switzerland. https://doi.org/10.1007/978-3-031-69766-1_9 bibtex: '@inbook{Meyer_Kenter_Petrica_O’Brien_Blott_Plessl_2024, place={Cham}, title={Optimizing Communication for Latency Sensitive HPC Applications on up to 48 FPGAs Using ACCL}, DOI={10.1007/978-3-031-69766-1_9}, booktitle={Lecture Notes in Computer Science}, publisher={Springer Nature Switzerland}, author={Meyer, Marius and Kenter, Tobias and Petrica, Lucian and O’Brien, Kenneth and Blott, Michaela and Plessl, Christian}, year={2024} }' chicago: 'Meyer, Marius, Tobias Kenter, Lucian Petrica, Kenneth O’Brien, Michaela Blott, and Christian Plessl. “Optimizing Communication for Latency Sensitive HPC Applications on up to 48 FPGAs Using ACCL.” In Lecture Notes in Computer Science. Cham: Springer Nature Switzerland, 2024. https://doi.org/10.1007/978-3-031-69766-1_9.' ieee: 'M. Meyer, T. Kenter, L. Petrica, K. O’Brien, M. Blott, and C. Plessl, “Optimizing Communication for Latency Sensitive HPC Applications on up to 48 FPGAs Using ACCL,” in Lecture Notes in Computer Science, Cham: Springer Nature Switzerland, 2024.' mla: Meyer, Marius, et al. “Optimizing Communication for Latency Sensitive HPC Applications on up to 48 FPGAs Using ACCL.” Lecture Notes in Computer Science, Springer Nature Switzerland, 2024, doi:10.1007/978-3-031-69766-1_9. short: 'M. Meyer, T. Kenter, L. Petrica, K. O’Brien, M. Blott, C. Plessl, in: Lecture Notes in Computer Science, Springer Nature Switzerland, Cham, 2024.' date_created: 2024-10-14T07:51:51Z date_updated: 2024-10-14T07:55:50Z department: - _id: '27' - _id: '518' doi: 10.1007/978-3-031-69766-1_9 language: - iso: eng main_file_link: - open_access: '1' oa: '1' place: Cham publication: Lecture Notes in Computer Science publication_identifier: isbn: - '9783031697654' - '9783031697661' issn: - 0302-9743 - 1611-3349 publication_status: published publisher: Springer Nature Switzerland quality_controlled: '1' status: public title: Optimizing Communication for Latency Sensitive HPC Applications on up to 48 FPGAs Using ACCL type: book_chapter user_id: '3145' year: '2024' ... --- _id: '56605' author: - first_name: Jan-Oliver full_name: Opdenhövel, Jan-Oliver id: '73960' last_name: Opdenhövel orcid: 0000-0003-2314-2784 - first_name: Christoph full_name: Alt, Christoph id: '100625' last_name: Alt - first_name: Christian full_name: Plessl, Christian id: '16153' last_name: Plessl orcid: 0000-0001-5728-9982 - first_name: Tobias full_name: Kenter, Tobias id: '3145' last_name: Kenter citation: ama: 'Opdenhövel J-O, Alt C, Plessl C, Kenter T. StencilStream: A SYCL-based Stencil Simulation Framework Targeting FPGAs. In: 2024 34th International Conference on Field-Programmable Logic and Applications (FPL). IEEE; 2024. doi:10.1109/fpl64840.2024.00023' apa: 'Opdenhövel, J.-O., Alt, C., Plessl, C., & Kenter, T. (2024). StencilStream: A SYCL-based Stencil Simulation Framework Targeting FPGAs. 2024 34th International Conference on Field-Programmable Logic and Applications (FPL). https://doi.org/10.1109/fpl64840.2024.00023' bibtex: '@inproceedings{Opdenhövel_Alt_Plessl_Kenter_2024, title={StencilStream: A SYCL-based Stencil Simulation Framework Targeting FPGAs}, DOI={10.1109/fpl64840.2024.00023}, booktitle={2024 34th International Conference on Field-Programmable Logic and Applications (FPL)}, publisher={IEEE}, author={Opdenhövel, Jan-Oliver and Alt, Christoph and Plessl, Christian and Kenter, Tobias}, year={2024} }' chicago: 'Opdenhövel, Jan-Oliver, Christoph Alt, Christian Plessl, and Tobias Kenter. “StencilStream: A SYCL-Based Stencil Simulation Framework Targeting FPGAs.” In 2024 34th International Conference on Field-Programmable Logic and Applications (FPL). IEEE, 2024. https://doi.org/10.1109/fpl64840.2024.00023.' ieee: 'J.-O. Opdenhövel, C. Alt, C. Plessl, and T. Kenter, “StencilStream: A SYCL-based Stencil Simulation Framework Targeting FPGAs,” 2024, doi: 10.1109/fpl64840.2024.00023.' mla: 'Opdenhövel, Jan-Oliver, et al. “StencilStream: A SYCL-Based Stencil Simulation Framework Targeting FPGAs.” 2024 34th International Conference on Field-Programmable Logic and Applications (FPL), IEEE, 2024, doi:10.1109/fpl64840.2024.00023.' short: 'J.-O. Opdenhövel, C. Alt, C. Plessl, T. Kenter, in: 2024 34th International Conference on Field-Programmable Logic and Applications (FPL), IEEE, 2024.' date_created: 2024-10-14T07:49:24Z date_updated: 2024-10-14T07:56:26Z department: - _id: '27' - _id: '518' doi: 10.1109/fpl64840.2024.00023 language: - iso: eng project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: 2024 34th International Conference on Field-Programmable Logic and Applications (FPL) publication_status: published publisher: IEEE quality_controlled: '1' status: public title: 'StencilStream: A SYCL-based Stencil Simulation Framework Targeting FPGAs' type: conference user_id: '3145' year: '2024' ... --- _id: '56607' author: - first_name: Abdul Rehman full_name: Tareen, Abdul Rehman id: '76938' last_name: Tareen - first_name: Marius full_name: Meyer, Marius id: '40778' last_name: Meyer - first_name: Christian full_name: Plessl, Christian id: '16153' last_name: Plessl orcid: 0000-0001-5728-9982 - first_name: Tobias full_name: Kenter, Tobias id: '3145' last_name: Kenter citation: ama: 'Tareen AR, Meyer M, Plessl C, Kenter T. HiHiSpMV: Sparse Matrix Vector Multiplication with Hierarchical Row Reductions on FPGAs with High Bandwidth Memory. In: 2024 IEEE 32nd Annual International Symposium on Field-Programmable Custom Computing Machines (FCCM). Vol 35. IEEE; 2024. doi:10.1109/fccm60383.2024.00014' apa: 'Tareen, A. R., Meyer, M., Plessl, C., & Kenter, T. (2024). HiHiSpMV: Sparse Matrix Vector Multiplication with Hierarchical Row Reductions on FPGAs with High Bandwidth Memory. 2024 IEEE 32nd Annual International Symposium on Field-Programmable Custom Computing Machines (FCCM), 35. https://doi.org/10.1109/fccm60383.2024.00014' bibtex: '@inproceedings{Tareen_Meyer_Plessl_Kenter_2024, title={HiHiSpMV: Sparse Matrix Vector Multiplication with Hierarchical Row Reductions on FPGAs with High Bandwidth Memory}, volume={35}, DOI={10.1109/fccm60383.2024.00014}, booktitle={2024 IEEE 32nd Annual International Symposium on Field-Programmable Custom Computing Machines (FCCM)}, publisher={IEEE}, author={Tareen, Abdul Rehman and Meyer, Marius and Plessl, Christian and Kenter, Tobias}, year={2024} }' chicago: 'Tareen, Abdul Rehman, Marius Meyer, Christian Plessl, and Tobias Kenter. “HiHiSpMV: Sparse Matrix Vector Multiplication with Hierarchical Row Reductions on FPGAs with High Bandwidth Memory.” In 2024 IEEE 32nd Annual International Symposium on Field-Programmable Custom Computing Machines (FCCM), Vol. 35. IEEE, 2024. https://doi.org/10.1109/fccm60383.2024.00014.' ieee: 'A. R. Tareen, M. Meyer, C. Plessl, and T. Kenter, “HiHiSpMV: Sparse Matrix Vector Multiplication with Hierarchical Row Reductions on FPGAs with High Bandwidth Memory,” in 2024 IEEE 32nd Annual International Symposium on Field-Programmable Custom Computing Machines (FCCM), 2024, vol. 35, doi: 10.1109/fccm60383.2024.00014.' mla: 'Tareen, Abdul Rehman, et al. “HiHiSpMV: Sparse Matrix Vector Multiplication with Hierarchical Row Reductions on FPGAs with High Bandwidth Memory.” 2024 IEEE 32nd Annual International Symposium on Field-Programmable Custom Computing Machines (FCCM), vol. 35, IEEE, 2024, doi:10.1109/fccm60383.2024.00014.' short: 'A.R. Tareen, M. Meyer, C. Plessl, T. Kenter, in: 2024 IEEE 32nd Annual International Symposium on Field-Programmable Custom Computing Machines (FCCM), IEEE, 2024.' date_created: 2024-10-14T07:59:08Z date_updated: 2024-10-14T12:27:55Z department: - _id: '27' - _id: '518' doi: 10.1109/fccm60383.2024.00014 intvolume: ' 35' language: - iso: eng publication: 2024 IEEE 32nd Annual International Symposium on Field-Programmable Custom Computing Machines (FCCM) publication_status: published publisher: IEEE quality_controlled: '1' status: public title: 'HiHiSpMV: Sparse Matrix Vector Multiplication with Hierarchical Row Reductions on FPGAs with High Bandwidth Memory' type: conference user_id: '3145' volume: 35 year: '2024' ... --- _id: '56609' abstract: - lang: eng text: 'The computation of electron repulsion integrals (ERIs) is a key component for quantum chemical methods. The intensive computation and bandwidth demand for ERI evaluation presents a significant challenge for quantum-mechanics-based atomistic simulations with hybrid density functional theory: due to the tens of trillions of ERI computations in each time step, practical applications are usually limited to thousands of atoms. In this work, we propose SERI, a high-throughput streaming accelerator for ERI computation on HBM-based FPGAs. In contrast to prior buffer-based designs, SERI proposes a novel streaming architecture to address the on-chip buffer limitation and the floorplanning challenge, and leverages the high-bandwidth memory to overcome the bandwidth bottleneck in prior designs. Moreover, to meet the varying computation, bandwidth, and floorplanning requirements between the 55 canonical quartet classes in ERI calculation, we design an automation tool, together with an accurate performance model, to automatically customize the architecture and floorplanning strategy for each canonical quartet class to maximize their throughput. Our performance evaluation on the AMD/Xilinx Alveo U280 FPGA board shows that, SERI achieves an average speedup of 9.80 x over the previous best-performing FPGA design, a 3.21x speedup over a 64-core AMD EPYC 7713 CPU, and a 15.64x speedup over an Nvidia A40 GPU. It reaches a peak throughput of 23.8 GERIS ($10^9$ ERIs per second) on one Alveo U280 FPGA. SERI will be released soon at https://github.com/SFU-HiAccel/SERI.' author: - first_name: Philip full_name: Stachura, Philip last_name: Stachura - first_name: Guanyu full_name: Li, Guanyu last_name: Li - first_name: Xin full_name: Wu, Xin id: '77439' last_name: Wu - first_name: Christian full_name: Plessl, Christian id: '16153' last_name: Plessl orcid: 0000-0001-5728-9982 - first_name: Zhenman full_name: Fang, Zhenman last_name: Fang citation: ama: 'Stachura P, Li G, Wu X, Plessl C, Fang Z. SERI: High-Throughput Streaming Acceleration of Electron Repulsion Integral Computation in Quantum Chemistry using HBM-based FPGAs. In: 2024 34th International Conference on Field-Programmable Logic and Applications (FPL). IEEE; 2024:60-68. doi:10.1109/fpl64840.2024.00018' apa: 'Stachura, P., Li, G., Wu, X., Plessl, C., & Fang, Z. (2024). SERI: High-Throughput Streaming Acceleration of Electron Repulsion Integral Computation in Quantum Chemistry using HBM-based FPGAs. 2024 34th International Conference on Field-Programmable Logic and Applications (FPL), 60–68. https://doi.org/10.1109/fpl64840.2024.00018' bibtex: '@inproceedings{Stachura_Li_Wu_Plessl_Fang_2024, title={SERI: High-Throughput Streaming Acceleration of Electron Repulsion Integral Computation in Quantum Chemistry using HBM-based FPGAs}, DOI={10.1109/fpl64840.2024.00018}, booktitle={2024 34th International Conference on Field-Programmable Logic and Applications (FPL)}, publisher={IEEE}, author={Stachura, Philip and Li, Guanyu and Wu, Xin and Plessl, Christian and Fang, Zhenman}, year={2024}, pages={60–68} }' chicago: 'Stachura, Philip, Guanyu Li, Xin Wu, Christian Plessl, and Zhenman Fang. “SERI: High-Throughput Streaming Acceleration of Electron Repulsion Integral Computation in Quantum Chemistry Using HBM-Based FPGAs.” In 2024 34th International Conference on Field-Programmable Logic and Applications (FPL), 60–68. IEEE, 2024. https://doi.org/10.1109/fpl64840.2024.00018.' ieee: 'P. Stachura, G. Li, X. Wu, C. Plessl, and Z. Fang, “SERI: High-Throughput Streaming Acceleration of Electron Repulsion Integral Computation in Quantum Chemistry using HBM-based FPGAs,” in 2024 34th International Conference on Field-Programmable Logic and Applications (FPL), 2024, pp. 60–68, doi: 10.1109/fpl64840.2024.00018.' mla: 'Stachura, Philip, et al. “SERI: High-Throughput Streaming Acceleration of Electron Repulsion Integral Computation in Quantum Chemistry Using HBM-Based FPGAs.” 2024 34th International Conference on Field-Programmable Logic and Applications (FPL), IEEE, 2024, pp. 60–68, doi:10.1109/fpl64840.2024.00018.' short: 'P. Stachura, G. Li, X. Wu, C. Plessl, Z. Fang, in: 2024 34th International Conference on Field-Programmable Logic and Applications (FPL), IEEE, 2024, pp. 60–68.' date_created: 2024-10-14T08:44:44Z date_updated: 2024-10-15T08:37:27Z department: - _id: '27' - _id: '518' doi: 10.1109/fpl64840.2024.00018 language: - iso: eng main_file_link: - url: https://ieeexplore.ieee.org/document/10705609 page: 60-68 project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: 2024 34th International Conference on Field-Programmable Logic and Applications (FPL) publication_status: published publisher: IEEE quality_controlled: '1' status: public title: 'SERI: High-Throughput Streaming Acceleration of Electron Repulsion Integral Computation in Quantum Chemistry using HBM-based FPGAs' type: conference user_id: '77439' year: '2024' ... --- _id: '61251' abstract: - lang: eng text: We theoretically investigate strategies for the deterministic creation of trains of time-bin entangled photons using an individual quantum emitter described by a Λ-type electronic system. We explicitly demonstrate the theoretical generation of linear cluster states with substantial numbers of entangled photonic qubits in full microscopic numerical simulations. The underlying scheme is based on the manipulation of ground state coherences through precise optical driving. One important finding is that the most easily accessible quality metrics, the achievable rotation fidelities, fall short in assessing the actual quantum correlations of the emitted photons in the face of losses. To address this, we explicitly calculate stabilizer generator expectation values as a superior gauge for the quantum properties of the generated many-photon state. With widespread applicability in other emitter and excitation–emission schemes also, our work lays the conceptual foundations for an in-depth practical analysis of time-bin entanglement based on full numerical simulations with predictive capabilities for realistic systems and setups, including losses and imperfections. The specific results shown in the present work illustrate that with controlled minimization of losses and realistic system parameters for quantum-dot type systems, useful linear cluster states of significant lengths can be generated in the calculations, discussing the possibility of scalability for quantum information processing endeavors. article_number: '036110' author: - first_name: David full_name: Bauch, David last_name: Bauch - first_name: Nikolas full_name: Köcher, Nikolas id: '79191' last_name: Köcher - first_name: Nils full_name: Heinisch, Nils id: '90283' last_name: Heinisch orcid: 0009-0006-0984-2097 - first_name: Stefan full_name: Schumacher, Stefan id: '27271' last_name: Schumacher orcid: 0000-0003-4042-4951 citation: ama: Bauch D, Köcher N, Heinisch N, Schumacher S. Time-bin entanglement in the deterministic generation of linear photonic cluster states. APL Quantum. 2024;1(3). doi:10.1063/5.0214197 apa: Bauch, D., Köcher, N., Heinisch, N., & Schumacher, S. (2024). Time-bin entanglement in the deterministic generation of linear photonic cluster states. APL Quantum, 1(3), Article 036110. https://doi.org/10.1063/5.0214197 bibtex: '@article{Bauch_Köcher_Heinisch_Schumacher_2024, title={Time-bin entanglement in the deterministic generation of linear photonic cluster states}, volume={1}, DOI={10.1063/5.0214197}, number={3036110}, journal={APL Quantum}, publisher={AIP Publishing}, author={Bauch, David and Köcher, Nikolas and Heinisch, Nils and Schumacher, Stefan}, year={2024} }' chicago: Bauch, David, Nikolas Köcher, Nils Heinisch, and Stefan Schumacher. “Time-Bin Entanglement in the Deterministic Generation of Linear Photonic Cluster States.” APL Quantum 1, no. 3 (2024). https://doi.org/10.1063/5.0214197. ieee: 'D. Bauch, N. Köcher, N. Heinisch, and S. Schumacher, “Time-bin entanglement in the deterministic generation of linear photonic cluster states,” APL Quantum, vol. 1, no. 3, Art. no. 036110, 2024, doi: 10.1063/5.0214197.' mla: Bauch, David, et al. “Time-Bin Entanglement in the Deterministic Generation of Linear Photonic Cluster States.” APL Quantum, vol. 1, no. 3, 036110, AIP Publishing, 2024, doi:10.1063/5.0214197. short: D. Bauch, N. Köcher, N. Heinisch, S. Schumacher, APL Quantum 1 (2024). date_created: 2025-09-12T11:08:59Z date_updated: 2025-09-12T11:11:32Z department: - _id: '15' - _id: '170' - _id: '297' - _id: '35' - _id: '230' - _id: '27' - _id: '429' - _id: '623' doi: 10.1063/5.0214197 intvolume: ' 1' issue: '3' language: - iso: eng project: - _id: '53' name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen' - _id: '56' name: TRR 142 - Project Area C - _id: '173' name: 'TRR 142; TP C09: Ideale Erzeugung von Photonenpaaren für Verschränkungsaustausch bei Telekom Wellenlängen' - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing - _id: '266' name: 'PhoQC: Photonisches Quantencomputing' publication: APL Quantum publication_identifier: issn: - 2835-0103 publication_status: published publisher: AIP Publishing status: public title: Time-bin entanglement in the deterministic generation of linear photonic cluster states type: journal_article user_id: '16199' volume: 1 year: '2024' ... --- _id: '61253' abstract: - lang: eng text: "In the SUPER scheme (Swing-UP of the quantum EmitteR population), excitation of a quantum emitter is achieved with two off-resonant, red-detuned laser pulses. This allows the generation of high-quality single photons without the need of complex laser stray light suppression or careful spectral filtering. In the present work, we extend this promising method to quantum emitters, specifically semiconductor quantum dots, inside a resonant optical cavity. A significant advantage of the SUPER scheme is identified in that it eliminates re-excitation of the quantum emitter by suppressing photon emission during the excitation cycle. This, in turn, leads to almost ideal single-photon purity, overcoming a major factor typically limiting the quality of photons generated with quantum emitters in high-quality cavities. We further find that for cavity-mediated biexciton emission of degenerate photon pairs, the SUPER scheme leads to near-perfect biexciton initialization with very high values of polarization entanglement of emitted photon pairs.\r\n \ \r\n \r\n \r\n \ \r\n Published by the American Physical Society\r\n 2024\r\n \ \r\n \r\n \ " article_number: L012017 author: - first_name: Nils full_name: Heinisch, Nils id: '90283' last_name: Heinisch orcid: 0009-0006-0984-2097 - first_name: Nikolas full_name: Köcher, Nikolas id: '79191' last_name: Köcher - first_name: David full_name: Bauch, David last_name: Bauch - first_name: Stefan full_name: Schumacher, Stefan id: '27271' last_name: Schumacher orcid: 0000-0003-4042-4951 citation: ama: 'Heinisch N, Köcher N, Bauch D, Schumacher S. Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs. Physical Review Research. 2024;6(1). doi:10.1103/physrevresearch.6.l012017' apa: 'Heinisch, N., Köcher, N., Bauch, D., & Schumacher, S. (2024). Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs. Physical Review Research, 6(1), Article L012017. https://doi.org/10.1103/physrevresearch.6.l012017' bibtex: '@article{Heinisch_Köcher_Bauch_Schumacher_2024, title={Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs}, volume={6}, DOI={10.1103/physrevresearch.6.l012017}, number={1L012017}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Heinisch, Nils and Köcher, Nikolas and Bauch, David and Schumacher, Stefan}, year={2024} }' chicago: 'Heinisch, Nils, Nikolas Köcher, David Bauch, and Stefan Schumacher. “Swing-up Dynamics in Quantum Emitter Cavity Systems: Near Ideal Single Photons and Entangled Photon Pairs.” Physical Review Research 6, no. 1 (2024). https://doi.org/10.1103/physrevresearch.6.l012017.' ieee: 'N. Heinisch, N. Köcher, D. Bauch, and S. Schumacher, “Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs,” Physical Review Research, vol. 6, no. 1, Art. no. L012017, 2024, doi: 10.1103/physrevresearch.6.l012017.' mla: 'Heinisch, Nils, et al. “Swing-up Dynamics in Quantum Emitter Cavity Systems: Near Ideal Single Photons and Entangled Photon Pairs.” Physical Review Research, vol. 6, no. 1, L012017, American Physical Society (APS), 2024, doi:10.1103/physrevresearch.6.l012017.' short: N. Heinisch, N. Köcher, D. Bauch, S. Schumacher, Physical Review Research 6 (2024). date_created: 2025-09-12T11:16:31Z date_updated: 2025-09-12T11:18:05Z department: - _id: '15' - _id: '170' - _id: '297' - _id: '35' - _id: '230' - _id: '429' - _id: '27' doi: 10.1103/physrevresearch.6.l012017 intvolume: ' 6' issue: '1' language: - iso: eng project: - _id: '52' name: 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: '56' name: TRR 142 - Project Area C - _id: '173' name: 'TRR 142; TP C09: Ideale Erzeugung von Photonenpaaren für Verschränkungsaustausch bei Telekom Wellenlängen' publication: Physical Review Research publication_identifier: issn: - 2643-1564 publication_status: published publisher: American Physical Society (APS) status: public title: 'Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs' type: journal_article user_id: '16199' volume: 6 year: '2024' ... --- _id: '61255' abstract: - lang: eng text: "Abstract\r\n Topological states have been widely investigated in different types of systems and lattices. In the present work, we report on topological edge states in double-wave (DW) chains, which can be described by a generalized Aubry-André-Harper (AAH) model. For the specific system of a driven-dissipative exciton polariton system we show that in such potential chains, different types of edge states can form. For resonant optical excitation, we further find that the optical nonlinearity leads to a multistability of different edge states. This includes topologically protected edge states evolved directly from individual linear eigenstates as well as additional edge states that originate from nonlinearity-induced localization of bulk states. Extending the system into two dimensions (2D) by stacking horizontal DW chains in the vertical direction, we also create 2D multi-wave lattices. In such 2D lattices multiple Su–Schrieffer–Heeger (SSH) chains appear along the vertical direction. The combination of DW chains in the horizonal and SSH chains in the vertical direction then results in the formation of higher-order topological insulator corner states. Multistable corner states emerge in the nonlinear regime." author: - first_name: Tobias full_name: Schneider, Tobias last_name: Schneider - first_name: Wenlong full_name: Gao, Wenlong id: '78853' last_name: Gao - first_name: Thomas full_name: Zentgraf, Thomas id: '30525' last_name: Zentgraf orcid: 0000-0002-8662-1101 - first_name: Stefan full_name: Schumacher, Stefan id: '27271' last_name: Schumacher orcid: 0000-0003-4042-4951 - first_name: Xuekai full_name: Ma, Xuekai id: '59416' last_name: Ma citation: ama: Schneider T, Gao W, Zentgraf T, Schumacher S, Ma X. Topological edge and corner states in coupled wave lattices in nonlinear polariton condensates. Nanophotonics. 2024;13(4):509-518. doi:10.1515/nanoph-2023-0556 apa: Schneider, T., Gao, W., Zentgraf, T., Schumacher, S., & Ma, X. (2024). Topological edge and corner states in coupled wave lattices in nonlinear polariton condensates. Nanophotonics, 13(4), 509–518. https://doi.org/10.1515/nanoph-2023-0556 bibtex: '@article{Schneider_Gao_Zentgraf_Schumacher_Ma_2024, title={Topological edge and corner states in coupled wave lattices in nonlinear polariton condensates}, volume={13}, DOI={10.1515/nanoph-2023-0556}, number={4}, journal={Nanophotonics}, publisher={Walter de Gruyter GmbH}, author={Schneider, Tobias and Gao, Wenlong and Zentgraf, Thomas and Schumacher, Stefan and Ma, Xuekai}, year={2024}, pages={509–518} }' chicago: 'Schneider, Tobias, Wenlong Gao, Thomas Zentgraf, Stefan Schumacher, and Xuekai Ma. “Topological Edge and Corner States in Coupled Wave Lattices in Nonlinear Polariton Condensates.” Nanophotonics 13, no. 4 (2024): 509–18. https://doi.org/10.1515/nanoph-2023-0556.' ieee: 'T. Schneider, W. Gao, T. Zentgraf, S. Schumacher, and X. Ma, “Topological edge and corner states in coupled wave lattices in nonlinear polariton condensates,” Nanophotonics, vol. 13, no. 4, pp. 509–518, 2024, doi: 10.1515/nanoph-2023-0556.' mla: Schneider, Tobias, et al. “Topological Edge and Corner States in Coupled Wave Lattices in Nonlinear Polariton Condensates.” Nanophotonics, vol. 13, no. 4, Walter de Gruyter GmbH, 2024, pp. 509–18, doi:10.1515/nanoph-2023-0556. short: T. Schneider, W. Gao, T. Zentgraf, S. Schumacher, X. Ma, Nanophotonics 13 (2024) 509–518. date_created: 2025-09-12T11:19:22Z date_updated: 2025-09-12T11:22:41Z department: - _id: '15' - _id: '170' - _id: '297' - _id: '705' - _id: '35' - _id: '230' - _id: '429' - _id: '27' doi: 10.1515/nanoph-2023-0556 intvolume: ' 13' issue: '4' language: - iso: eng page: 509-518 project: - _id: '52' name: 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: '54' name: TRR 142 - Project Area A - _id: '55' name: TRR 142 - Project Area B - _id: '61' name: 'TRR 142; TP A04: Nichtlineare Quantenprozesstomographie und Photonik mit Polaritonen in Mikrokavitäten' - _id: '170' name: 'TRR 142; TP B09: Effiziente Erzeugung mit maßgeschneiderter optischer Phaselage der zweiten Harmonischen mittels Quasi-gebundener Zustände in GaAs Metaoberflächen' publication: Nanophotonics publication_identifier: issn: - 2192-8614 publication_status: published publisher: Walter de Gruyter GmbH status: public title: Topological edge and corner states in coupled wave lattices in nonlinear polariton condensates type: journal_article user_id: '16199' volume: 13 year: '2024' ... --- _id: '61257' abstract: - lang: eng text: "Exceptional points (EPs), with their intriguing spectral topology, have attracted considerable attention in a broad range of physical systems, with potential sensing applications driving much of the present research in this field. Here, we investigate spectral topology and EPs in systems with significant nonlinearity, exemplified by a nonequilibrium exciton-polariton condensate. With the possibility to control loss and gain and nonlinearity by optical means, this system allows for a comprehensive analysis of the interplay of nonlinearities (Kerr type and saturable gain) and non-Hermiticity. Not only do we find that EPs can be intentionally shifted in parameter space by the saturable gain, but we also observe intriguing rotations and intersections of Riemann surfaces and find nonlinearity-enhanced sensing capabilities. With this, our results illustrate the potential of tailoring spectral topology and related phenomena in non-Hermitian systems by nonlinearity.\r\n \ \r\n \r\n \r\n \ \r\n Published by the American Physical Society\r\n 2024\r\n \ \r\n \r\n \ " article_number: '013148' author: - first_name: Jan full_name: Wingenbach, Jan id: '69187' last_name: Wingenbach - first_name: Stefan full_name: Schumacher, Stefan id: '27271' last_name: Schumacher orcid: 0000-0003-4042-4951 - first_name: Xuekai full_name: Ma, Xuekai id: '59416' last_name: Ma citation: ama: Wingenbach J, Schumacher S, Ma X. Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems. Physical Review Research. 2024;6(1). doi:10.1103/physrevresearch.6.013148 apa: Wingenbach, J., Schumacher, S., & Ma, X. (2024). Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems. Physical Review Research, 6(1), Article 013148. https://doi.org/10.1103/physrevresearch.6.013148 bibtex: '@article{Wingenbach_Schumacher_Ma_2024, title={Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems}, volume={6}, DOI={10.1103/physrevresearch.6.013148}, number={1013148}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Wingenbach, Jan and Schumacher, Stefan and Ma, Xuekai}, year={2024} }' chicago: Wingenbach, Jan, Stefan Schumacher, and Xuekai Ma. “Manipulating Spectral Topology and Exceptional Points by Nonlinearity in Non-Hermitian Polariton Systems.” Physical Review Research 6, no. 1 (2024). https://doi.org/10.1103/physrevresearch.6.013148. ieee: 'J. Wingenbach, S. Schumacher, and X. Ma, “Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems,” Physical Review Research, vol. 6, no. 1, Art. no. 013148, 2024, doi: 10.1103/physrevresearch.6.013148.' mla: Wingenbach, Jan, et al. “Manipulating Spectral Topology and Exceptional Points by Nonlinearity in Non-Hermitian Polariton Systems.” Physical Review Research, vol. 6, no. 1, 013148, American Physical Society (APS), 2024, doi:10.1103/physrevresearch.6.013148. short: J. Wingenbach, S. Schumacher, X. Ma, Physical Review Research 6 (2024). date_created: 2025-09-12T11:23:33Z date_updated: 2025-09-12T11:24:59Z department: - _id: '15' - _id: '170' - _id: '297' - _id: '705' - _id: '35' - _id: '230' - _id: '27' - _id: '429' doi: 10.1103/physrevresearch.6.013148 intvolume: ' 6' issue: '1' language: - iso: eng project: - _id: '52' name: 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: '54' name: TRR 142 - Project Area A - _id: '61' name: 'TRR 142; TP A04: Nichtlineare Quantenprozesstomographie und Photonik mit Polaritonen in Mikrokavitäten' publication: Physical Review Research publication_identifier: issn: - 2643-1564 publication_status: published publisher: American Physical Society (APS) status: public title: Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems type: journal_article user_id: '16199' volume: 6 year: '2024' ... --- _id: '61259' author: - first_name: Fabian full_name: Bauch, Fabian last_name: Bauch - first_name: Chuan-Ding full_name: Dong, Chuan-Ding last_name: Dong - first_name: Stefan full_name: Schumacher, Stefan id: '27271' last_name: Schumacher orcid: 0000-0003-4042-4951 citation: ama: Bauch F, Dong C-D, Schumacher S. Dynamics of Electron–Hole Coulomb Attractive Energy and Dipole Moment of Hot Excitons in Donor–Acceptor Polymers. The Journal of Physical Chemistry C. 2024;128(8):3525-3532. doi:10.1021/acs.jpcc.3c07513 apa: Bauch, F., Dong, C.-D., & Schumacher, S. (2024). Dynamics of Electron–Hole Coulomb Attractive Energy and Dipole Moment of Hot Excitons in Donor–Acceptor Polymers. The Journal of Physical Chemistry C, 128(8), 3525–3532. https://doi.org/10.1021/acs.jpcc.3c07513 bibtex: '@article{Bauch_Dong_Schumacher_2024, title={Dynamics of Electron–Hole Coulomb Attractive Energy and Dipole Moment of Hot Excitons in Donor–Acceptor Polymers}, volume={128}, DOI={10.1021/acs.jpcc.3c07513}, number={8}, journal={The Journal of Physical Chemistry C}, publisher={American Chemical Society (ACS)}, author={Bauch, Fabian and Dong, Chuan-Ding and Schumacher, Stefan}, year={2024}, pages={3525–3532} }' chicago: 'Bauch, Fabian, Chuan-Ding Dong, and Stefan Schumacher. “Dynamics of Electron–Hole Coulomb Attractive Energy and Dipole Moment of Hot Excitons in Donor–Acceptor Polymers.” The Journal of Physical Chemistry C 128, no. 8 (2024): 3525–32. https://doi.org/10.1021/acs.jpcc.3c07513.' ieee: 'F. Bauch, C.-D. Dong, and S. Schumacher, “Dynamics of Electron–Hole Coulomb Attractive Energy and Dipole Moment of Hot Excitons in Donor–Acceptor Polymers,” The Journal of Physical Chemistry C, vol. 128, no. 8, pp. 3525–3532, 2024, doi: 10.1021/acs.jpcc.3c07513.' mla: Bauch, Fabian, et al. “Dynamics of Electron–Hole Coulomb Attractive Energy and Dipole Moment of Hot Excitons in Donor–Acceptor Polymers.” The Journal of Physical Chemistry C, vol. 128, no. 8, American Chemical Society (ACS), 2024, pp. 3525–32, doi:10.1021/acs.jpcc.3c07513. short: F. Bauch, C.-D. Dong, S. Schumacher, The Journal of Physical Chemistry C 128 (2024) 3525–3532. date_created: 2025-09-12T11:26:49Z date_updated: 2025-09-12T11:27:57Z department: - _id: '15' - _id: '170' - _id: '297' - _id: '35' - _id: '230' - _id: '27' doi: 10.1021/acs.jpcc.3c07513 intvolume: ' 128' issue: '8' language: - iso: eng page: 3525-3532 project: - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: The Journal of Physical Chemistry C publication_identifier: issn: - 1932-7447 - 1932-7455 publication_status: published publisher: American Chemical Society (ACS) status: public title: Dynamics of Electron–Hole Coulomb Attractive Energy and Dipole Moment of Hot Excitons in Donor–Acceptor Polymers type: journal_article user_id: '16199' volume: 128 year: '2024' ...