[{"date_created":"2025-02-05T12:57:37Z","type":"journal_article","department":[{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"293"},{"_id":"35"},{"_id":"230"},{"_id":"623"},{"_id":"27"}],"publication":"Quantum","abstract":[{"lang":"eng","text":"A unified theoretical approach to describe the properties of multimode squeezed light generated in a lossy medium is presented. This approach is valid for Markovian environments and includes both a model of discrete losses based on the beamsplitter approach and a generalized continuous loss model based on the spatial Langevin equation. For an important class of Gaussian states, we derive master equations for the second-order correlation functions and illustrate their solution for both frequency-independent and frequency-dependent losses. Studying the mode structure, we demonstrate that in a lossy environment no broadband basis without quadrature correlations between the different broadband modes exists. Therefore, various techniques and strategies to introduce broadband modes can be considered. We show that the Mercer expansion and the Williamson-Euler decomposition do not provide modes in which the maximal squeezing contained in the system can be measured. In turn, we find a new broadband basis that maximizes squeezing in the lossy system and present an algorithm to construct it."}],"article_number":"1621","language":[{"iso":"eng"}],"doi":"10.22331/q-2025-02-04-1621","year":"2025","title":"Theory of Multimode Squeezed Light Generation in Lossy Media","author":[{"full_name":"Kopylov, Denis A.","first_name":"Denis A.","last_name":"Kopylov"},{"orcid":"0000-0001-8864-2072","last_name":"Meier","first_name":"Torsten","full_name":"Meier, Torsten","id":"344"},{"id":"60286","last_name":"Sharapova","first_name":"Polina R.","full_name":"Sharapova, Polina R."}],"publication_identifier":{"issn":["2521-327X"]},"date_updated":"2025-09-18T13:22:26Z","publication_status":"published","intvolume":" 9","citation":{"ieee":"D. A. Kopylov, T. Meier, and P. R. Sharapova, “Theory of Multimode Squeezed Light Generation in Lossy Media,” Quantum, vol. 9, Art. no. 1621, 2025, doi: 10.22331/q-2025-02-04-1621.","apa":"Kopylov, D. A., Meier, T., & Sharapova, P. R. (2025). Theory of Multimode Squeezed Light Generation in Lossy Media. Quantum, 9, Article 1621. https://doi.org/10.22331/q-2025-02-04-1621","chicago":"Kopylov, Denis A., Torsten Meier, and Polina R. Sharapova. “Theory of Multimode Squeezed Light Generation in Lossy Media.” Quantum 9 (2025). https://doi.org/10.22331/q-2025-02-04-1621.","short":"D.A. Kopylov, T. Meier, P.R. Sharapova, Quantum 9 (2025).","mla":"Kopylov, Denis A., et al. “Theory of Multimode Squeezed Light Generation in Lossy Media.” Quantum, vol. 9, 1621, Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften, 2025, doi:10.22331/q-2025-02-04-1621.","bibtex":"@article{Kopylov_Meier_Sharapova_2025, title={Theory of Multimode Squeezed Light Generation in Lossy Media}, volume={9}, DOI={10.22331/q-2025-02-04-1621}, number={1621}, journal={Quantum}, publisher={Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften}, author={Kopylov, Denis A. and Meier, Torsten and Sharapova, Polina R.}, year={2025} }","ama":"Kopylov DA, Meier T, Sharapova PR. Theory of Multimode Squeezed Light Generation in Lossy Media. Quantum. 2025;9. doi:10.22331/q-2025-02-04-1621"},"project":[{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","_id":"266"},{"name":"Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"publisher":"Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften","_id":"58519","user_id":"16199","volume":9,"status":"public"},{"user_id":"158","ddc":["530"],"volume":4,"page":"2356","_id":"60891","publisher":"Optica Publishing Group","has_accepted_license":"1","status":"public","file_date_updated":"2025-10-05T11:48:25Z","citation":{"ieee":"M. Hammer, S. Khan, B. Taheri, H. Farheen, and J. Förstner, “TFLN channel waveguides of rib and strip type: Properties of guided modes,” Optics Continuum, vol. 4, no. 10, p. 2356, 2025, doi: 10.1364/optcon.569959.","apa":"Hammer, M., Khan, S., Taheri, B., Farheen, H., & Förstner, J. (2025). TFLN channel waveguides of rib and strip type: Properties of guided modes. Optics Continuum, 4(10), 2356. https://doi.org/10.1364/optcon.569959","short":"M. Hammer, S. Khan, B. Taheri, H. Farheen, J. Förstner, Optics Continuum 4 (2025) 2356.","chicago":"Hammer, Manfred, Shahriar Khan, Behnood Taheri, Henna Farheen, and Jens Förstner. “TFLN Channel Waveguides of Rib and Strip Type: Properties of Guided Modes.” Optics Continuum 4, no. 10 (2025): 2356. https://doi.org/10.1364/optcon.569959.","mla":"Hammer, Manfred, et al. “TFLN Channel Waveguides of Rib and Strip Type: Properties of Guided Modes.” Optics Continuum, vol. 4, no. 10, Optica Publishing Group, 2025, p. 2356, doi:10.1364/optcon.569959.","bibtex":"@article{Hammer_Khan_Taheri_Farheen_Förstner_2025, title={TFLN channel waveguides of rib and strip type: Properties of guided modes}, volume={4}, DOI={10.1364/optcon.569959}, number={10}, journal={Optics Continuum}, publisher={Optica Publishing Group}, author={Hammer, Manfred and Khan, Shahriar and Taheri, Behnood and Farheen, Henna and Förstner, Jens}, year={2025}, pages={2356} }","ama":"Hammer M, Khan S, Taheri B, Farheen H, Förstner J. TFLN channel waveguides of rib and strip type: Properties of guided modes. Optics Continuum. 2025;4(10):2356. doi:10.1364/optcon.569959"},"doi":"10.1364/optcon.569959","language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2025-10-05T11:52:55Z","intvolume":" 4","title":"TFLN channel waveguides of rib and strip type: Properties of guided modes","year":"2025","publication_identifier":{"issn":["2770-0208"]},"author":[{"orcid":"0000-0002-6331-9348","first_name":"Manfred","last_name":"Hammer","full_name":"Hammer, Manfred","id":"48077"},{"full_name":"Khan, Shahriar","last_name":"Khan","first_name":"Shahriar"},{"full_name":"Taheri, Behnood","first_name":"Behnood","last_name":"Taheri"},{"last_name":"Farheen","orcid":"0000-0001-7730-3489","first_name":"Henna","full_name":"Farheen, Henna","id":"53444"},{"id":"158","orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens","full_name":"Förstner, Jens"}],"type":"journal_article","keyword":["tet_topic_waveguide"],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"file":[{"date_created":"2025-10-05T11:48:25Z","creator":"fossie","success":1,"content_type":"application/pdf","file_id":"61516","access_level":"closed","file_size":5417636,"file_name":"2025-08 Hammer - Optics Continuum - TFLN channel waveguides of rib and strip type. Properties of guided modes (official version).pdf","date_updated":"2025-10-05T11:48:25Z","relation":"main_file"}],"date_created":"2025-08-06T09:36:30Z","abstract":[{"lang":"eng","text":"Straight dielectric waveguide channels made from slabs of thin-film lithium niobate (TFLN), or lithium niobate on insulator (LNOI), are investigated in the linear regime, for channels of rib and strip type with common trapezoidal cross sections, in Z-cut and X-cut samples at varying on-chip orientation. We clarify the theoretical basis for the waveguides with potentially non-diagonal core permittivity. Symmetry classes can be distinguished that differ in their consequences for potential modal degeneracy and polarization conversion. Our rigorous numerical analysis by means of a finite-element solver takes the anisotropy of the lithium niobate cores rigorously into account. We discuss extensive data for effective indices, polarization properties, and hybridization of guided modes, in single- and multimode channels. Scans over the waveguide width and orientation as primary parameters are complemented by a series of illustrations of vectorial mode profiles. These turn out to be essentially complex in cases of X-cut channels at non-crystal-axis-aligned orientations."}],"publication":"Optics Continuum","issue":"10"},{"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"keyword":["tet_topic_waveguide"],"type":"conference","date_created":"2025-10-08T15:20:13Z","abstract":[{"lang":"eng","text":"We present a topology-optimized silicon nitride (Si3N4) coupler designed to enhance the coupling efficiency between integrated single-photon emitters and photonic waveguide modes. By leveraging inverse design techniques, we optimize the coupler’s geometry to maximize power transfer while maintaining fabrication feasibility by improving mode overlap and directional emission, addressing the challenge of low coupling efficiency caused by size mismatch and material incompatibility. Simulations demonstrate a substantial enhancement in photon extraction and waveguide coupling. This approach can be extended to other photonic devices, offering a versatile framework for improving quantum light-matter interactions in integrated photonics."}],"citation":{"apa":"Farheen, H., Chen, Y., Chen, P., Kryvobok, A., Peana, S., Senichev, A., Shalaev, V. M., Boltasseva, A., Förstner, J., & Kildishev, A. V. (2025). Topology-optimized silicon nitride coupler for integrated single-photon emitters. In X. Ni & W. Cai (Eds.), Photonic Computing: From Materials and Devices to Systems and Applications II. SPIE. https://doi.org/10.1117/12.3065734","ieee":"H. Farheen et al., “Topology-optimized silicon nitride coupler for integrated single-photon emitters,” in Photonic Computing: From Materials and Devices to Systems and Applications II, 2025, doi: 10.1117/12.3065734.","short":"H. Farheen, Y. Chen, P. Chen, A. Kryvobok, S. Peana, A. Senichev, V.M. Shalaev, A. Boltasseva, J. Förstner, A.V. Kildishev, in: X. Ni, W. Cai (Eds.), Photonic Computing: From Materials and Devices to Systems and Applications II, SPIE, 2025.","chicago":"Farheen, Henna, Yuheng Chen, Peigang Chen, Artem Kryvobok, Samuel Peana, Alexander Senichev, Vladimir M. Shalaev, Alexandra Boltasseva, Jens Förstner, and Alexander V. Kildishev. “Topology-Optimized Silicon Nitride Coupler for Integrated Single-Photon Emitters.” In Photonic Computing: From Materials and Devices to Systems and Applications II, edited by Xingjie Ni and Wenshan Cai. SPIE, 2025. https://doi.org/10.1117/12.3065734.","mla":"Farheen, Henna, et al. “Topology-Optimized Silicon Nitride Coupler for Integrated Single-Photon Emitters.” Photonic Computing: From Materials and Devices to Systems and Applications II, edited by Xingjie Ni and Wenshan Cai, SPIE, 2025, doi:10.1117/12.3065734.","ama":"Farheen H, Chen Y, Chen P, et al. Topology-optimized silicon nitride coupler for integrated single-photon emitters. In: Ni X, Cai W, eds. Photonic Computing: From Materials and Devices to Systems and Applications II. SPIE; 2025. doi:10.1117/12.3065734","bibtex":"@inproceedings{Farheen_Chen_Chen_Kryvobok_Peana_Senichev_Shalaev_Boltasseva_Förstner_Kildishev_2025, title={Topology-optimized silicon nitride coupler for integrated single-photon emitters}, DOI={10.1117/12.3065734}, booktitle={Photonic Computing: From Materials and Devices to Systems and Applications II}, publisher={SPIE}, author={Farheen, Henna and Chen, Yuheng and Chen, Peigang and Kryvobok, Artem and Peana, Samuel and Senichev, Alexander and Shalaev, Vladimir M. and Boltasseva, Alexandra and Förstner, Jens and Kildishev, Alexander V.}, editor={Ni, Xingjie and Cai, Wenshan}, year={2025} }"},"publication":"Photonic Computing: From Materials and Devices to Systems and Applications II","editor":[{"first_name":"Xingjie","last_name":"Ni","full_name":"Ni, Xingjie"},{"first_name":"Wenshan","last_name":"Cai","full_name":"Cai, Wenshan"}],"user_id":"158","doi":"10.1117/12.3065734","_id":"61760","publisher":"SPIE","language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2025-10-08T15:22:30Z","author":[{"id":"53444","full_name":"Farheen, Henna","orcid":"0000-0001-7730-3489","last_name":"Farheen","first_name":"Henna"},{"first_name":"Yuheng","last_name":"Chen","full_name":"Chen, Yuheng"},{"last_name":"Chen","first_name":"Peigang","full_name":"Chen, Peigang"},{"full_name":"Kryvobok, Artem","last_name":"Kryvobok","first_name":"Artem"},{"full_name":"Peana, Samuel","first_name":"Samuel","last_name":"Peana"},{"first_name":"Alexander","last_name":"Senichev","full_name":"Senichev, Alexander"},{"full_name":"Shalaev, Vladimir M.","last_name":"Shalaev","first_name":"Vladimir M."},{"full_name":"Boltasseva, Alexandra","first_name":"Alexandra","last_name":"Boltasseva"},{"orcid":"0000-0001-7059-9862","first_name":"Jens","last_name":"Förstner","full_name":"Förstner, Jens","id":"158"},{"full_name":"Kildishev, Alexander V.","first_name":"Alexander V.","last_name":"Kildishev"}],"status":"public","year":"2025","title":"Topology-optimized silicon nitride coupler for integrated single-photon emitters"},{"quality_controlled":"1","file_date_updated":"2025-09-24T07:19:36Z","isi":"1","citation":{"mla":"Neugum, Michael, and Arno Schindlmayr. “Ab Initio Calculations of Spin Waves: A Review of Theoretical Approaches and Applications.” Materials, vol. 18, no. 18, 4431, MDPI, 2025, doi:10.3390/ma18184431.","apa":"Neugum, M., & Schindlmayr, A. (2025). Ab initio calculations of spin waves: A review of theoretical approaches and applications. Materials, 18(18), Article 4431. https://doi.org/10.3390/ma18184431","ieee":"M. Neugum and A. Schindlmayr, “Ab initio calculations of spin waves: A review of theoretical approaches and applications,” Materials, vol. 18, no. 18, Art. no. 4431, 2025, doi: 10.3390/ma18184431.","short":"M. Neugum, A. Schindlmayr, Materials 18 (2025).","ama":"Neugum M, Schindlmayr A. Ab initio calculations of spin waves: A review of theoretical approaches and applications. Materials. 2025;18(18). doi:10.3390/ma18184431","chicago":"Neugum, Michael, and Arno Schindlmayr. “Ab Initio Calculations of Spin Waves: A Review of Theoretical Approaches and Applications.” Materials 18, no. 18 (2025). https://doi.org/10.3390/ma18184431.","bibtex":"@article{Neugum_Schindlmayr_2025, title={Ab initio calculations of spin waves: A review of theoretical approaches and applications}, volume={18}, DOI={10.3390/ma18184431}, number={184431}, journal={Materials}, publisher={MDPI}, author={Neugum, Michael and Schindlmayr, Arno}, year={2025} }"},"oa":"1","external_id":{"isi":["001580599300001"]},"has_accepted_license":"1","status":"public","user_id":"458","ddc":["530"],"volume":18,"publisher":"MDPI","_id":"61279","abstract":[{"text":"Spin waves represent an important class of low-energy excitations in magnetic solids, which influence the thermodynamic properties and play a major role in technical applications, such as spintronics or magnetic data storage. Despite the enormous advances of ab initio simulations in materials science, quantitative calculations of spin-wave spectra still pose a significant challenge, because the collective nature of the spin dynamics requires an accurate treatment of the Coulomb interaction between the electrons. As a consequence, simple lattice models like the Heisenberg Hamiltonian are still widespread in practical investigations, but modern techniques like time-dependent density-functional theory or many-body perturbation theory also open a route to material-specific spin-wave calculations from first principles. Although both are in principle exact, actual implementations necessarily employ approximations for electronic exchange and correlation as well as additional numerical simplifications. In this review, we recapitulate the theoretical foundations of ab initio spin-wave calculations and analyze the common approximations that underlie present implementations. In addition, we survey the available results for spin-wave dispersions of various magnetic materials and compare the performance of different computational approaches. In this way, we provide an overview of the present state of the art and identify directions for further developments.","lang":"eng"}],"issue":"18","publication":"Materials","type":"journal_article","department":[{"_id":"296"},{"_id":"15"},{"_id":"170"},{"_id":"35"},{"_id":"230"}],"file":[{"date_created":"2025-09-24T07:19:36Z","description":"Creative Commons Attribution 4.0 International Public License (CC BY 4.0)","creator":"schindlm","content_type":"application/pdf","file_id":"61422","title":"Ab initio calculations of spin waves: A review of theoretical approaches and applications","access_level":"open_access","file_size":611341,"file_name":"materials-18-04431.pdf","date_updated":"2025-09-24T07:19:36Z","relation":"main_file"}],"date_created":"2025-09-15T16:14:59Z","publication_status":"published","date_updated":"2025-10-10T07:31:23Z","article_type":"review","intvolume":" 18","title":"Ab initio calculations of spin waves: A review of theoretical approaches and applications","year":"2025","publication_identifier":{"eissn":["1996-1944"]},"author":[{"full_name":"Neugum, Michael","last_name":"Neugum","first_name":"Michael","id":"80813"},{"first_name":"Arno","last_name":"Schindlmayr","orcid":"0000-0002-4855-071X","full_name":"Schindlmayr, Arno","id":"458"}],"doi":"10.3390/ma18184431","article_number":"4431","language":[{"iso":"eng"}]},{"abstract":[{"lang":"eng","text":"Miller's rule originated as an empirical relation between the nonlinear and linear optical coefficients of materials. It is now accepted as a useful tool for guiding experiments and computational materials discovery, but its theoretical foundation had long been limited to a derivation for the classical Lorentz model with a weak anharmonic perturbation. Recently, we developed a mathematical framework which enabled us to prove that Miller's rule is equally valid for quantum anharmonic oscillators, despite different dynamics due to zero-point fluctuations and further quantum-mechanical effects. However, our previous derivation applied only to one-dimensional oscillators and to the special case of second- and third-harmonic generation in a monochromatic electric field. Here we extend the proof to three-dimensional quantum anharmonic oscillators and also treat all orders of the nonlinear response to an arbitrary multi-frequency field. This makes the results applicable to a much larger range of physical systems and nonlinear optical processes. The obtained generalized Miller formulae rigorously express all tensor elements of the frequency-dependent nonlinear susceptibilities in terms of the linear susceptibility and thus allow a computationally inexpensive quantitative prediction of arbitrary parametric frequency-mixing processes from a small initial dataset."}],"publication":"Dynamics","issue":"3","type":"journal_article","department":[{"_id":"296"},{"_id":"230"},{"_id":"15"},{"_id":"170"},{"_id":"35"}],"file":[{"file_name":"dynamics-05-00034.pdf","access_level":"open_access","file_size":375897,"relation":"main_file","date_updated":"2025-08-28T12:27:05Z","file_id":"61056","content_type":"application/pdf","title":"Generalized Miller formulae for quantum anharmonic oscillators","creator":"schindlm","date_created":"2025-08-28T12:23:26Z","description":"Creative Commons Attribution 4.0 International Public License (CC BY 4.0)"}],"date_created":"2025-08-20T09:46:13Z","date_updated":"2025-10-10T07:29:36Z","publication_status":"published","intvolume":" 5","article_type":"original","year":"2025","title":"Generalized Miller formulae for quantum anharmonic oscillators","publication_identifier":{"eissn":["2673-8716"]},"author":[{"first_name":"Maximilian Tim","orcid":"0009-0003-4899-0920","last_name":"Meyer","full_name":"Meyer, Maximilian Tim","id":"77895"},{"id":"458","full_name":"Schindlmayr, Arno","first_name":"Arno","last_name":"Schindlmayr","orcid":"0000-0002-4855-071X"}],"doi":"10.3390/dynamics5030034","article_number":"34","language":[{"iso":"eng"}],"quality_controlled":"1","file_date_updated":"2025-08-28T12:27:05Z","citation":{"ama":"Meyer MT, Schindlmayr A. Generalized Miller formulae for quantum anharmonic oscillators. Dynamics. 2025;5(3). doi:10.3390/dynamics5030034","bibtex":"@article{Meyer_Schindlmayr_2025, title={Generalized Miller formulae for quantum anharmonic oscillators}, volume={5}, DOI={10.3390/dynamics5030034}, number={334}, journal={Dynamics}, publisher={MDPI}, author={Meyer, Maximilian Tim and Schindlmayr, Arno}, year={2025} }","mla":"Meyer, Maximilian Tim, and Arno Schindlmayr. “Generalized Miller Formulae for Quantum Anharmonic Oscillators.” Dynamics, vol. 5, no. 3, 34, MDPI, 2025, doi:10.3390/dynamics5030034.","short":"M.T. Meyer, A. Schindlmayr, Dynamics 5 (2025).","chicago":"Meyer, Maximilian Tim, and Arno Schindlmayr. “Generalized Miller Formulae for Quantum Anharmonic Oscillators.” Dynamics 5, no. 3 (2025). https://doi.org/10.3390/dynamics5030034.","apa":"Meyer, M. T., & Schindlmayr, A. (2025). Generalized Miller formulae for quantum anharmonic oscillators. Dynamics, 5(3), Article 34. https://doi.org/10.3390/dynamics5030034","ieee":"M. T. Meyer and A. Schindlmayr, “Generalized Miller formulae for quantum anharmonic oscillators,” Dynamics, vol. 5, no. 3, Art. no. 34, 2025, doi: 10.3390/dynamics5030034."},"isi":"1","oa":"1","external_id":{"isi":["001581270200001"]},"has_accepted_license":"1","status":"public","ddc":["530"],"user_id":"458","volume":5,"_id":"60959","publisher":"MDPI"},{"doi":"10.1364/oe.580201","main_file_link":[{"url":"https://opg.optica.org/oe/fulltext.cfm?uri=oe-33-24-51085","open_access":"1"}],"article_number":"51085","language":[{"iso":"eng"}],"date_updated":"2025-11-24T06:35:19Z","publication_status":"published","intvolume":" 33","article_type":"original","title":"In vacuum metasurface for optical microtrap array","year":"2025","author":[{"first_name":"Donghao","last_name":"Li","full_name":"Li, Donghao"},{"first_name":"Qiming","last_name":"Liao","full_name":"Liao, Qiming"},{"full_name":"Xu, Beining","last_name":"Xu","first_name":"Beining"},{"full_name":"Zentgraf, Thomas","last_name":"Zentgraf","first_name":"Thomas","orcid":"0000-0002-8662-1101","id":"30525"},{"full_name":"Narvaez Castaneda, Emmanuel","last_name":"Narvaez Castaneda","first_name":"Emmanuel"},{"full_name":"Zhou, Yaoting","first_name":"Yaoting","last_name":"Zhou"},{"full_name":"Qin, Keyu","first_name":"Keyu","last_name":"Qin"},{"last_name":"Xu","first_name":"Zhongxiao","full_name":"Xu, Zhongxiao"},{"full_name":"Shen, Heng","last_name":"Shen","first_name":"Heng"},{"last_name":"Huang","first_name":"Lingling","full_name":"Huang, Lingling"}],"publication_identifier":{"issn":["1094-4087"]},"type":"journal_article","department":[{"_id":"15"},{"_id":"230"},{"_id":"289"},{"_id":"623"}],"date_created":"2025-11-24T06:31:17Z","abstract":[{"text":"Optical tweezer arrays of laser-cooled and individually controlled particles have revolutionized atomic, molecular, and optical physics. They afford exquisite capabilities for applications in quantum simulation of many-body physics, quantum computation, and sensing. Underlying this development is the technical maturity of generating scalable optical beams, enabled by active components and a high numerical aperture objective. However, such a complex combination of bulk optics outside the vacuum chamber is very sensitive to any vibration and drift. Here, we demonstrate the generation of a 3 × 3 static tweezer array with a single chip-scale multifunctional metasurface element in vacuum, replacing the meter-long free space optics. Fluorescence counts on the camera validate the successful trapping of the atomic ensemble array and showcase a promising strategy for integrated photonics with cold atom systems. The introduction of a polarization independent dual-wavelength metasurface significantly enhances fluorescence collection efficiency while reducing experimental complexity. This approach paves the way for scalable neutral atom platforms and offers a compelling route towards the realization of next generation quantum metasurfaces.","lang":"eng"}],"publication":"Optics Express","issue":"24","user_id":"30525","volume":33,"publisher":"Optica Publishing Group","_id":"62286","status":"public","oa":"1","quality_controlled":"1","citation":{"ieee":"D. Li et al., “In vacuum metasurface for optical microtrap array,” Optics Express, vol. 33, no. 24, Art. no. 51085, 2025, doi: 10.1364/oe.580201.","apa":"Li, D., Liao, Q., Xu, B., Zentgraf, T., Narvaez Castaneda, E., Zhou, Y., Qin, K., Xu, Z., Shen, H., & Huang, L. (2025). In vacuum metasurface for optical microtrap array. Optics Express, 33(24), Article 51085. https://doi.org/10.1364/oe.580201","chicago":"Li, Donghao, Qiming Liao, Beining Xu, Thomas Zentgraf, Emmanuel Narvaez Castaneda, Yaoting Zhou, Keyu Qin, Zhongxiao Xu, Heng Shen, and Lingling Huang. “In Vacuum Metasurface for Optical Microtrap Array.” Optics Express 33, no. 24 (2025). https://doi.org/10.1364/oe.580201.","short":"D. Li, Q. Liao, B. Xu, T. Zentgraf, E. Narvaez Castaneda, Y. Zhou, K. Qin, Z. Xu, H. Shen, L. Huang, Optics Express 33 (2025).","mla":"Li, Donghao, et al. “In Vacuum Metasurface for Optical Microtrap Array.” Optics Express, vol. 33, no. 24, 51085, Optica Publishing Group, 2025, doi:10.1364/oe.580201.","bibtex":"@article{Li_Liao_Xu_Zentgraf_Narvaez Castaneda_Zhou_Qin_Xu_Shen_Huang_2025, title={In vacuum metasurface for optical microtrap array}, volume={33}, DOI={10.1364/oe.580201}, number={2451085}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Li, Donghao and Liao, Qiming and Xu, Beining and Zentgraf, Thomas and Narvaez Castaneda, Emmanuel and Zhou, Yaoting and Qin, Keyu and Xu, Zhongxiao and Shen, Heng and Huang, Lingling}, year={2025} }","ama":"Li D, Liao Q, Xu B, et al. In vacuum metasurface for optical microtrap array. Optics Express. 2025;33(24). doi:10.1364/oe.580201"}},{"publication_status":"published","date_updated":"2025-12-04T12:34:45Z","title":"Molecular Orientation‐Dependent Photonic Spin–Orbit Coupling in Organic Microcavities Filled with 2D Polymorphic Crystals","year":"2025","status":"public","publication_identifier":{"issn":["1863-8880","1863-8899"]},"author":[{"first_name":"Ying","last_name":"Ji","full_name":"Ji, Ying"},{"id":"59416","full_name":"Ma, Xuekai","first_name":"Xuekai","last_name":"Ma"},{"first_name":"Han","last_name":"Huang","full_name":"Huang, Han"},{"full_name":"Deng, Yibo","first_name":"Yibo","last_name":"Deng"},{"last_name":"Wang","first_name":"Pingyang","full_name":"Wang, Pingyang"},{"full_name":"Long, Teng","first_name":"Teng","last_name":"Long"},{"full_name":"Li, Yuan","first_name":"Yuan","last_name":"Li"},{"full_name":"Zhao, Ruiyang","last_name":"Zhao","first_name":"Ruiyang"},{"full_name":"Li, Yunfei","last_name":"Li","first_name":"Yunfei"},{"last_name":"An","first_name":"Cunbin","full_name":"An, Cunbin"},{"id":"27271","full_name":"Schumacher, Stefan","first_name":"Stefan","last_name":"Schumacher","orcid":"0000-0003-4042-4951"},{"full_name":"Gu, Chunling","last_name":"Gu","first_name":"Chunling"},{"full_name":"Liao, Bo","last_name":"Liao","first_name":"Bo"},{"last_name":"Fu","first_name":"Hongbing","full_name":"Fu, Hongbing"},{"last_name":"Liao","first_name":"Qing","full_name":"Liao, Qing"}],"user_id":"16199","doi":"10.1002/lpor.202501874","article_number":"e01874","_id":"62867","language":[{"iso":"eng"}],"publisher":"Wiley","abstract":[{"lang":"eng","text":"ABSTRACT\r\n Effective manipulation of photonic spin–orbit coupling (SOC) in microcavities is of fundamental importance within topological photonics and applications. Anisotropic organic single‐crystalline materials can induce abundant SOC phenomenon due to their flexible tunability of molecular geometries, however, the intrinsic relationship between molecular geometries/orientations in 3D space and photonic SOC is lacking. In this study, we design two kinds of 2D organic polymorphs for the construction of organic microcavities to investigate the structure‐performance relationships. In two polymorphic microcavities, two distinctive photonic SOC phenomena are observed regardless of the in‐plane anisotropy of organic polymorphs. Theoretical analysis indicates that the photonic SOC strength is strongly influenced by the synergies between the crystal anisotropy and the tilted collective molecular transition dipole moment. Our results uncover the correlation mechanism between the structure of molecules and photonic SOC and open an avenue to engineer complex photonic SOC by use of organic microstructures towards the development of diverse integrated photonic devices."}],"publication":"Laser & Photonics Reviews","citation":{"mla":"Ji, Ying, et al. “Molecular Orientation‐Dependent Photonic Spin–Orbit Coupling in Organic Microcavities Filled with 2D Polymorphic Crystals.” Laser & Photonics Reviews, e01874, Wiley, 2025, doi:10.1002/lpor.202501874.","bibtex":"@article{Ji_Ma_Huang_Deng_Wang_Long_Li_Zhao_Li_An_et al._2025, title={Molecular Orientation‐Dependent Photonic Spin–Orbit Coupling in Organic Microcavities Filled with 2D Polymorphic Crystals}, DOI={10.1002/lpor.202501874}, number={e01874}, journal={Laser & Photonics Reviews}, publisher={Wiley}, author={Ji, Ying and Ma, Xuekai and Huang, Han and Deng, Yibo and Wang, Pingyang and Long, Teng and Li, Yuan and Zhao, Ruiyang and Li, Yunfei and An, Cunbin and et al.}, year={2025} }","ama":"Ji Y, Ma X, Huang H, et al. Molecular Orientation‐Dependent Photonic Spin–Orbit Coupling in Organic Microcavities Filled with 2D Polymorphic Crystals. Laser & Photonics Reviews. Published online 2025. doi:10.1002/lpor.202501874","ieee":"Y. Ji et al., “Molecular Orientation‐Dependent Photonic Spin–Orbit Coupling in Organic Microcavities Filled with 2D Polymorphic Crystals,” Laser & Photonics Reviews, Art. no. e01874, 2025, doi: 10.1002/lpor.202501874.","apa":"Ji, Y., Ma, X., Huang, H., Deng, Y., Wang, P., Long, T., Li, Y., Zhao, R., Li, Y., An, C., Schumacher, S., Gu, C., Liao, B., Fu, H., & Liao, Q. (2025). Molecular Orientation‐Dependent Photonic Spin–Orbit Coupling in Organic Microcavities Filled with 2D Polymorphic Crystals. Laser & Photonics Reviews, Article e01874. https://doi.org/10.1002/lpor.202501874","short":"Y. Ji, X. Ma, H. Huang, Y. Deng, P. Wang, T. Long, Y. Li, R. Zhao, Y. Li, C. An, S. Schumacher, C. Gu, B. Liao, H. Fu, Q. Liao, Laser & Photonics Reviews (2025).","chicago":"Ji, Ying, Xuekai Ma, Han Huang, Yibo Deng, Pingyang Wang, Teng Long, Yuan Li, et al. “Molecular Orientation‐Dependent Photonic Spin–Orbit Coupling in Organic Microcavities Filled with 2D Polymorphic Crystals.” Laser & Photonics Reviews, 2025. https://doi.org/10.1002/lpor.202501874."},"type":"journal_article","department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"705"},{"_id":"35"},{"_id":"230"}],"date_created":"2025-12-04T12:33:48Z"},{"language":[{"iso":"eng"}],"article_number":"121103","doi":"10.1063/5.0287076","publication_identifier":{"issn":["0003-6951","1077-3118"]},"author":[{"full_name":"Ai, Qiang","first_name":"Qiang","last_name":"Ai"},{"last_name":"Ma","first_name":"Xuekai","full_name":"Ma, Xuekai","id":"59416"},{"id":"63631","full_name":"Barkhausen, Franziska","last_name":"Barkhausen","first_name":"Franziska"},{"full_name":"Zhai, Xiaokun","first_name":"Xiaokun","last_name":"Zhai"},{"first_name":"Chunzi","last_name":"Xing","full_name":"Xing, Chunzi"},{"last_name":"Yang","first_name":"Xinmiao","full_name":"Yang, Xinmiao"},{"full_name":"Wang, Peilin","first_name":"Peilin","last_name":"Wang"},{"full_name":"Liu, Tianyu","last_name":"Liu","first_name":"Tianyu"},{"first_name":"Yong","last_name":"Zhang","full_name":"Zhang, Yong"},{"last_name":"Gu","first_name":"Yazhou","full_name":"Gu, Yazhou"},{"full_name":"Li, Peigang","last_name":"Li","first_name":"Peigang"},{"full_name":"Li, Zhitong","first_name":"Zhitong","last_name":"Li"},{"full_name":"Hatzopoulos, Zacharias","last_name":"Hatzopoulos","first_name":"Zacharias"},{"first_name":"Pavlos G.","last_name":"Savvidis","full_name":"Savvidis, Pavlos G."},{"full_name":"Schumacher, Stefan","first_name":"Stefan","orcid":"0000-0003-4042-4951","last_name":"Schumacher","id":"27271"},{"last_name":"Gao","first_name":"Tingge","full_name":"Gao, Tingge"}],"year":"2025","title":"Tuning polariton vortices in an asymmetric ring potential","intvolume":" 127","date_updated":"2025-12-04T12:27:02Z","publication_status":"published","date_created":"2025-12-04T12:25:12Z","department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"705"},{"_id":"35"},{"_id":"230"},{"_id":"27"}],"type":"journal_article","issue":"12","publication":"Applied Physics Letters","abstract":[{"lang":"eng","text":"Exciton polariton condensates are macroscopic coherent states in which topological excitations can be observed. In this work, we observe the excitation of the vortices and realize tuning the topological charge by manipulating the pumping configurations. Using a digital micromirror device, we constructed an annular pumping pattern where the inner and outer rings can be easily tuned. Both the number and the topological charge of the vortices can be changed by slightly tuning the inner ring position against the outer ring. The experimental results can be reproduced in theory by the Gross–Pitaevskii equation. Our work offers to generate and manipulate vortices in exciton polariton condensates using a straightforward optical method."}],"_id":"62862","publisher":"AIP Publishing","volume":127,"user_id":"16199","status":"public","citation":{"apa":"Ai, Q., Ma, X., Barkhausen, F., Zhai, X., Xing, C., Yang, X., Wang, P., Liu, T., Zhang, Y., Gu, Y., Li, P., Li, Z., Hatzopoulos, Z., Savvidis, P. G., Schumacher, S., & Gao, T. (2025). Tuning polariton vortices in an asymmetric ring potential. Applied Physics Letters, 127(12), Article 121103. https://doi.org/10.1063/5.0287076","ieee":"Q. Ai et al., “Tuning polariton vortices in an asymmetric ring potential,” Applied Physics Letters, vol. 127, no. 12, Art. no. 121103, 2025, doi: 10.1063/5.0287076.","short":"Q. Ai, X. Ma, F. Barkhausen, X. Zhai, C. Xing, X. Yang, P. Wang, T. Liu, Y. Zhang, Y. Gu, P. Li, Z. Li, Z. Hatzopoulos, P.G. Savvidis, S. Schumacher, T. Gao, Applied Physics Letters 127 (2025).","chicago":"Ai, Qiang, Xuekai Ma, Franziska Barkhausen, Xiaokun Zhai, Chunzi Xing, Xinmiao Yang, Peilin Wang, et al. “Tuning Polariton Vortices in an Asymmetric Ring Potential.” Applied Physics Letters 127, no. 12 (2025). https://doi.org/10.1063/5.0287076.","mla":"Ai, Qiang, et al. “Tuning Polariton Vortices in an Asymmetric Ring Potential.” Applied Physics Letters, vol. 127, no. 12, 121103, AIP Publishing, 2025, doi:10.1063/5.0287076.","ama":"Ai Q, Ma X, Barkhausen F, et al. Tuning polariton vortices in an asymmetric ring potential. Applied Physics Letters. 2025;127(12). doi:10.1063/5.0287076","bibtex":"@article{Ai_Ma_Barkhausen_Zhai_Xing_Yang_Wang_Liu_Zhang_Gu_et al._2025, title={Tuning polariton vortices in an asymmetric ring potential}, volume={127}, DOI={10.1063/5.0287076}, number={12121103}, journal={Applied Physics Letters}, publisher={AIP Publishing}, author={Ai, Qiang and Ma, Xuekai and Barkhausen, Franziska and Zhai, Xiaokun and Xing, Chunzi and Yang, Xinmiao and Wang, Peilin and Liu, Tianyu and Zhang, Yong and Gu, Yazhou and et al.}, year={2025} }"},"project":[{"name":"Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}]},{"publication":"Physical Review B","issue":"11","date_created":"2025-12-04T12:28:52Z","type":"journal_article","department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"705"},{"_id":"35"},{"_id":"230"}],"title":"Higher-order dark solitons and control dynamics in microcavity polariton condensates","year":"2025","publication_identifier":{"issn":["2469-9950","2469-9969"]},"author":[{"full_name":"Sun, Jinming","first_name":"Jinming","last_name":"Sun"},{"first_name":"Manna","last_name":"Chen","full_name":"Chen, Manna"},{"id":"27271","last_name":"Schumacher","orcid":"0000-0003-4042-4951","first_name":"Stefan","full_name":"Schumacher, Stefan"},{"full_name":"Hu, Wei","last_name":"Hu","first_name":"Wei"},{"first_name":"Xuekai","last_name":"Ma","full_name":"Ma, Xuekai","id":"59416"}],"publication_status":"published","date_updated":"2025-12-04T12:29:37Z","intvolume":" 112","article_number":"115305","language":[{"iso":"eng"}],"doi":"10.1103/p357-vyq8","citation":{"bibtex":"@article{Sun_Chen_Schumacher_Hu_Ma_2025, title={Higher-order dark solitons and control dynamics in microcavity polariton condensates}, volume={112}, DOI={10.1103/p357-vyq8}, number={11115305}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Sun, Jinming and Chen, Manna and Schumacher, Stefan and Hu, Wei and Ma, Xuekai}, year={2025} }","ama":"Sun J, Chen M, Schumacher S, Hu W, Ma X. Higher-order dark solitons and control dynamics in microcavity polariton condensates. Physical Review B. 2025;112(11). doi:10.1103/p357-vyq8","mla":"Sun, Jinming, et al. “Higher-Order Dark Solitons and Control Dynamics in Microcavity Polariton Condensates.” Physical Review B, vol. 112, no. 11, 115305, American Physical Society (APS), 2025, doi:10.1103/p357-vyq8.","chicago":"Sun, Jinming, Manna Chen, Stefan Schumacher, Wei Hu, and Xuekai Ma. “Higher-Order Dark Solitons and Control Dynamics in Microcavity Polariton Condensates.” Physical Review B 112, no. 11 (2025). https://doi.org/10.1103/p357-vyq8.","short":"J. Sun, M. Chen, S. Schumacher, W. Hu, X. Ma, Physical Review B 112 (2025).","ieee":"J. Sun, M. Chen, S. Schumacher, W. Hu, and X. Ma, “Higher-order dark solitons and control dynamics in microcavity polariton condensates,” Physical Review B, vol. 112, no. 11, Art. no. 115305, 2025, doi: 10.1103/p357-vyq8.","apa":"Sun, J., Chen, M., Schumacher, S., Hu, W., & Ma, X. (2025). Higher-order dark solitons and control dynamics in microcavity polariton condensates. Physical Review B, 112(11), Article 115305. https://doi.org/10.1103/p357-vyq8"},"status":"public","_id":"62865","publisher":"American Physical Society (APS)","user_id":"16199","volume":112},{"_id":"62912","publisher":"American Physical Society (APS)","volume":7,"user_id":"16199","status":"public","citation":{"apa":"Ali, U., Holthaus, M., & Meier, T. (2025). Wave packet dynamics in parabolic optical lattices: From Bloch oscillations to long-range dynamical tunneling. Physical Review Research, 7(1), Article 013141. https://doi.org/10.1103/physrevresearch.7.013141","mla":"Ali, Usman, et al. “Wave Packet Dynamics in Parabolic Optical Lattices: From Bloch Oscillations to Long-Range Dynamical Tunneling.” Physical Review Research, vol. 7, no. 1, 013141, American Physical Society (APS), 2025, doi:10.1103/physrevresearch.7.013141.","ieee":"U. Ali, M. Holthaus, and T. Meier, “Wave packet dynamics in parabolic optical lattices: From Bloch oscillations to long-range dynamical tunneling,” Physical Review Research, vol. 7, no. 1, Art. no. 013141, 2025, doi: 10.1103/physrevresearch.7.013141.","ama":"Ali U, Holthaus M, Meier T. Wave packet dynamics in parabolic optical lattices: From Bloch oscillations to long-range dynamical tunneling. Physical Review Research. 2025;7(1). doi:10.1103/physrevresearch.7.013141","short":"U. Ali, M. Holthaus, T. Meier, Physical Review Research 7 (2025).","chicago":"Ali, Usman, Martin Holthaus, and Torsten Meier. “Wave Packet Dynamics in Parabolic Optical Lattices: From Bloch Oscillations to Long-Range Dynamical Tunneling.” Physical Review Research 7, no. 1 (2025). https://doi.org/10.1103/physrevresearch.7.013141.","bibtex":"@article{Ali_Holthaus_Meier_2025, title={Wave packet dynamics in parabolic optical lattices: From Bloch oscillations to long-range dynamical tunneling}, volume={7}, DOI={10.1103/physrevresearch.7.013141}, number={1013141}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Ali, Usman and Holthaus, Martin and Meier, Torsten}, year={2025} }"},"language":[{"iso":"eng"}],"article_number":"013141","doi":"10.1103/physrevresearch.7.013141","author":[{"first_name":"Usman","last_name":"Ali","full_name":"Ali, Usman"},{"full_name":"Holthaus, Martin","first_name":"Martin","last_name":"Holthaus"},{"full_name":"Meier, Torsten","orcid":"0000-0001-8864-2072","first_name":"Torsten","last_name":"Meier","id":"344"}],"publication_identifier":{"issn":["2643-1564"]},"year":"2025","title":"Wave packet dynamics in parabolic optical lattices: From Bloch oscillations to long-range dynamical tunneling","intvolume":" 7","date_updated":"2025-12-05T09:37:10Z","publication_status":"published","date_created":"2025-12-05T09:36:31Z","department":[{"_id":"15"},{"_id":"170"},{"_id":"293"},{"_id":"230"},{"_id":"35"}],"type":"journal_article","publication":"Physical Review Research","issue":"1","abstract":[{"lang":"eng","text":"We investigate the dynamics of wave packets in a parabolic optical lattice formed by combining an optical lattice with a global parabolic trap. Our study examines the phase space representation of the system's eigenstates by comparing them to the classical phase space of a pendulum, to which the system effectively maps. The analysis reveals that quantum states can exhibit mixed dynamics by straddling the separatrix. A key finding is that the dynamics around the separatrix enables the controlled creation of highly nonclassical states, distinguishing them from the classical oscillatory or rotational dynamics of the pendulum. By considering a finite momentum of the initial wave packet, we demonstrate various dynamical regimes. Furthermore, a slight energy mismatch between nearly degenerate states localized at opposite turning points of the trap potential results in controlled long-range dynamical tunneling. These results can be interpreted as quantum beating between a clockwise rotating and a counterclockwise rotating pendulum."}]},{"abstract":[{"lang":"eng","text":"In this paper, we theoretically study the spectral and temporal properties of pulsed spontaneous parametric down-conversion (SPDC) generated in lossy waveguides. Our theoretical approach is based on the formalism of Gaussian states and the Langevin equation, which is elaborated for weak parametric down-conversion and photon-number-unresolved click detection. Using the example of frequency-degenerate type-II SPDC generated under the pump-idler group-velocity-matching condition, we show how the joint-spectral intensity, mode structure, normalized second-order correlation function, and Hong-Ou-Mandel interference pattern depend on internal losses of the SPDC process. We found that the joint-spectral intensity is almost insensitive to internal losses, while the second-order correlation function shows a strong dependence on them, being different for the signal and idler beams in the presence of internal losses. Based on the sensitivity of the normalized second-order correlation function, we show how its measurement can be used to experimentally determine internal losses."}],"issue":"3","publication":"Physical Review Research","department":[{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"293"},{"_id":"288"},{"_id":"230"},{"_id":"623"},{"_id":"429"},{"_id":"35"}],"type":"journal_article","date_created":"2025-12-05T09:33:36Z","intvolume":" 7","publication_status":"published","date_updated":"2025-12-05T09:55:22Z","publication_identifier":{"issn":["2643-1564"]},"author":[{"first_name":"Denis A.","last_name":"Kopylov","full_name":"Kopylov, Denis A."},{"id":"42777","last_name":"Stefszky","first_name":"Michael","full_name":"Stefszky, Michael"},{"id":"344","orcid":"0000-0001-8864-2072","first_name":"Torsten","last_name":"Meier","full_name":"Meier, Torsten"},{"id":"26263","full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn"},{"id":"60286","full_name":"Sharapova, Polina R.","first_name":"Polina R.","last_name":"Sharapova"}],"year":"2025","title":"Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation","doi":"10.1103/zp72-7qwl","language":[{"iso":"eng"}],"article_number":"033122","project":[{"name":"PhoQC: Photonisches Quantencomputing","_id":"266"},{"name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"_id":"56","name":"TRR 142 - Project Area C"},{"_id":"174","name":"TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen Systemen: Eine theoretische Analyse"}],"citation":{"ama":"Kopylov DA, Stefszky M, Meier T, Silberhorn C, Sharapova PR. Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation. Physical Review Research. 2025;7(3). doi:10.1103/zp72-7qwl","bibtex":"@article{Kopylov_Stefszky_Meier_Silberhorn_Sharapova_2025, title={Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation}, volume={7}, DOI={10.1103/zp72-7qwl}, number={3033122}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Kopylov, Denis A. and Stefszky, Michael and Meier, Torsten and Silberhorn, Christine and Sharapova, Polina R.}, year={2025} }","mla":"Kopylov, Denis A., et al. “Spectral and Temporal Properties of Type-II Parametric down-Conversion: The Impact of Losses during State Generation.” Physical Review Research, vol. 7, no. 3, 033122, American Physical Society (APS), 2025, doi:10.1103/zp72-7qwl.","chicago":"Kopylov, Denis A., Michael Stefszky, Torsten Meier, Christine Silberhorn, and Polina R. Sharapova. “Spectral and Temporal Properties of Type-II Parametric down-Conversion: The Impact of Losses during State Generation.” Physical Review Research 7, no. 3 (2025). https://doi.org/10.1103/zp72-7qwl.","short":"D.A. Kopylov, M. Stefszky, T. Meier, C. Silberhorn, P.R. Sharapova, Physical Review Research 7 (2025).","apa":"Kopylov, D. A., Stefszky, M., Meier, T., Silberhorn, C., & Sharapova, P. R. (2025). Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation. Physical Review Research, 7(3), Article 033122. https://doi.org/10.1103/zp72-7qwl","ieee":"D. A. Kopylov, M. Stefszky, T. Meier, C. Silberhorn, and P. R. Sharapova, “Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation,” Physical Review Research, vol. 7, no. 3, Art. no. 033122, 2025, doi: 10.1103/zp72-7qwl."},"status":"public","volume":7,"user_id":"16199","_id":"62911","publisher":"American Physical Society (APS)"},{"citation":{"chicago":"Hunstig, Anna, Sebastian Peitz, Hendrik Rose, and Torsten Meier. “Accelerating the Analysis of Optical Quantum Systems Using the Koopman Operator.” In 2024 IEEE 63rd Conference on Decision and Control (CDC). IEEE, 2025. https://doi.org/10.1109/cdc56724.2024.10886589.","short":"A. Hunstig, S. Peitz, H. Rose, T. Meier, in: 2024 IEEE 63rd Conference on Decision and Control (CDC), IEEE, 2025.","ieee":"A. Hunstig, S. Peitz, H. Rose, and T. Meier, “Accelerating the analysis of optical quantum systems using the Koopman operator,” 2025, doi: 10.1109/cdc56724.2024.10886589.","apa":"Hunstig, A., Peitz, S., Rose, H., & Meier, T. (2025). Accelerating the analysis of optical quantum systems using the Koopman operator. 2024 IEEE 63rd Conference on Decision and Control (CDC). https://doi.org/10.1109/cdc56724.2024.10886589","bibtex":"@inproceedings{Hunstig_Peitz_Rose_Meier_2025, title={Accelerating the analysis of optical quantum systems using the Koopman operator}, DOI={10.1109/cdc56724.2024.10886589}, booktitle={2024 IEEE 63rd Conference on Decision and Control (CDC)}, publisher={IEEE}, author={Hunstig, Anna and Peitz, Sebastian and Rose, Hendrik and Meier, Torsten}, year={2025} }","ama":"Hunstig A, Peitz S, Rose H, Meier T. Accelerating the analysis of optical quantum systems using the Koopman operator. In: 2024 IEEE 63rd Conference on Decision and Control (CDC). IEEE; 2025. doi:10.1109/cdc56724.2024.10886589","mla":"Hunstig, Anna, et al. “Accelerating the Analysis of Optical Quantum Systems Using the Koopman Operator.” 2024 IEEE 63rd Conference on Decision and Control (CDC), IEEE, 2025, doi:10.1109/cdc56724.2024.10886589."},"publication":"2024 IEEE 63rd Conference on Decision and Control (CDC)","project":[{"_id":"266","name":"PhoQC: Photonisches Quantencomputing"}],"date_created":"2025-12-05T09:37:58Z","department":[{"_id":"15"},{"_id":"170"},{"_id":"293"},{"_id":"230"},{"_id":"623"},{"_id":"35"}],"type":"conference","author":[{"full_name":"Hunstig, Anna","last_name":"Hunstig","first_name":"Anna","id":"73659"},{"full_name":"Peitz, Sebastian","first_name":"Sebastian","orcid":"0000-0002-3389-793X","last_name":"Peitz","id":"47427"},{"full_name":"Rose, Hendrik","orcid":"0000-0002-3079-5428","last_name":"Rose","first_name":"Hendrik","id":"55958"},{"id":"344","full_name":"Meier, Torsten","last_name":"Meier","first_name":"Torsten","orcid":"0000-0001-8864-2072"}],"status":"public","title":"Accelerating the analysis of optical quantum systems using the Koopman operator","year":"2025","date_updated":"2025-12-05T09:40:24Z","publication_status":"published","language":[{"iso":"eng"}],"_id":"62913","publisher":"IEEE","doi":"10.1109/cdc56724.2024.10886589","user_id":"16199"},{"publication_status":"published","date_updated":"2025-12-05T13:34:10Z","intvolume":" 760","year":"2025","title":"Phosphonic acid adsorption on α-Bi2O3 surfaces","publication_identifier":{"issn":["0039-6028"]},"author":[{"id":"58349","full_name":"Bocchini, Adriana","orcid":"0000-0002-2134-3075","first_name":"Adriana","last_name":"Bocchini"},{"first_name":"S.","last_name":"Kollmann","full_name":"Kollmann, S."},{"first_name":"Uwe","last_name":"Gerstmann","orcid":"0000-0002-4476-223X","full_name":"Gerstmann, Uwe","id":"171"},{"id":"468","first_name":"Wolf Gero","last_name":"Schmidt","orcid":"0000-0002-2717-5076","full_name":"Schmidt, Wolf Gero"},{"full_name":"Grundmeier, Guido","first_name":"Guido","last_name":"Grundmeier","id":"194"}],"doi":"10.1016/j.susc.2025.122776","article_number":"122776","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1016/j.susc.2025.122776"}],"language":[{"iso":"eng"}],"publication":"Surface Science","type":"journal_article","department":[{"_id":"15"},{"_id":"2"},{"_id":"230"},{"_id":"295"},{"_id":"790"},{"_id":"302"},{"_id":"429"},{"_id":"35"},{"_id":"170"},{"_id":"27"}],"date_created":"2025-07-09T09:23:04Z","status":"public","user_id":"16199","volume":760,"_id":"60568","publisher":"Elsevier BV","project":[{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"_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"}],"citation":{"bibtex":"@article{Bocchini_Kollmann_Gerstmann_Schmidt_Grundmeier_2025, title={Phosphonic acid adsorption on <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" altimg=\"si23.svg\" display=\"inline\" id=\"d1e564\"><mml:mi>α</mml:mi></mml:math>-Bi<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" altimg=\"si24.svg\" display=\"inline\" id=\"d1e569\"><mml:msub><mml:mrow/><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math>O<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" altimg=\"si25.svg\" display=\"inline\" id=\"d1e577\"><mml:msub><mml:mrow/><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:math> surfaces}, volume={760}, DOI={10.1016/j.susc.2025.122776}, number={122776}, journal={Surface Science}, publisher={Elsevier BV}, author={Bocchini, Adriana and Kollmann, S. and Gerstmann, Uwe and Schmidt, Wolf Gero and Grundmeier, Guido}, year={2025} }","ama":"Bocchini A, Kollmann S, Gerstmann U, Schmidt WG, Grundmeier G. Phosphonic acid adsorption on <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" altimg=\"si23.svg\" display=\"inline\" id=\"d1e564\"><mml:mi>α</mml:mi></mml:math>-Bi<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" altimg=\"si24.svg\" display=\"inline\" id=\"d1e569\"><mml:msub><mml:mrow/><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math>O<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" altimg=\"si25.svg\" display=\"inline\" id=\"d1e577\"><mml:msub><mml:mrow/><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:math> surfaces. Surface Science. 2025;760. doi:10.1016/j.susc.2025.122776","mla":"Bocchini, Adriana, et al. “Phosphonic Acid Adsorption on <mml:Math Xmlns:Mml=\"http://Www.W3.Org/1998/Math/MathML\" Altimg=\"si23.Svg\" Display=\"inline\" Id=\"d1e564\"><mml:Mi>α</Mml:Mi></Mml:Math>-Bi<mml:Math Xmlns:Mml=\"http://Www.W3.Org/1998/Math/MathML\" Altimg=\"si24.Svg\" Display=\"inline\" Id=\"d1e569\"><mml:Msub><mml:Mrow/><mml:Mrow><mml:Mn>2</Mml:Mn></Mml:Mrow></Mml:Msub></Mml:Math>O<mml:Math Xmlns:Mml=\"http://Www.W3.Org/1998/Math/MathML\" Altimg=\"si25.Svg\" Display=\"inline\" Id=\"d1e577\"><mml:Msub><mml:Mrow/><mml:Mrow><mml:Mn>3</Mml:Mn></Mml:Mrow></Mml:Msub></Mml:Math> Surfaces.” Surface Science, vol. 760, 122776, Elsevier BV, 2025, doi:10.1016/j.susc.2025.122776.","short":"A. Bocchini, S. Kollmann, U. Gerstmann, W.G. Schmidt, G. Grundmeier, Surface Science 760 (2025).","chicago":"Bocchini, Adriana, S. Kollmann, Uwe Gerstmann, Wolf Gero Schmidt, and Guido Grundmeier. “Phosphonic Acid Adsorption on <mml:Math Xmlns:Mml=\"http://Www.W3.Org/1998/Math/MathML\" Altimg=\"si23.Svg\" Display=\"inline\" Id=\"d1e564\"><mml:Mi>α</Mml:Mi></Mml:Math>-Bi<mml:Math Xmlns:Mml=\"http://Www.W3.Org/1998/Math/MathML\" Altimg=\"si24.Svg\" Display=\"inline\" Id=\"d1e569\"><mml:Msub><mml:Mrow/><mml:Mrow><mml:Mn>2</Mml:Mn></Mml:Mrow></Mml:Msub></Mml:Math>O<mml:Math Xmlns:Mml=\"http://Www.W3.Org/1998/Math/MathML\" Altimg=\"si25.Svg\" Display=\"inline\" Id=\"d1e577\"><mml:Msub><mml:Mrow/><mml:Mrow><mml:Mn>3</Mml:Mn></Mml:Mrow></Mml:Msub></Mml:Math> Surfaces.” Surface Science 760 (2025). https://doi.org/10.1016/j.susc.2025.122776.","ieee":"A. Bocchini, S. Kollmann, U. Gerstmann, W. G. Schmidt, and G. Grundmeier, “Phosphonic acid adsorption on <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" altimg=\"si23.svg\" display=\"inline\" id=\"d1e564\"><mml:mi>α</mml:mi></mml:math>-Bi<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" altimg=\"si24.svg\" display=\"inline\" id=\"d1e569\"><mml:msub><mml:mrow/><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math>O<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" altimg=\"si25.svg\" display=\"inline\" id=\"d1e577\"><mml:msub><mml:mrow/><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:math> surfaces,” Surface Science, vol. 760, Art. no. 122776, 2025, doi: 10.1016/j.susc.2025.122776.","apa":"Bocchini, A., Kollmann, S., Gerstmann, U., Schmidt, W. G., & Grundmeier, G. (2025). Phosphonic acid adsorption on <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" altimg=\"si23.svg\" display=\"inline\" id=\"d1e564\"><mml:mi>α</mml:mi></mml:math>-Bi<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" altimg=\"si24.svg\" display=\"inline\" id=\"d1e569\"><mml:msub><mml:mrow/><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math>O<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" altimg=\"si25.svg\" display=\"inline\" id=\"d1e577\"><mml:msub><mml:mrow/><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:math> surfaces. Surface Science, 760, Article 122776. https://doi.org/10.1016/j.susc.2025.122776"},"oa":"1"},{"intvolume":" 3027","date_updated":"2025-12-05T13:32:45Z","publication_status":"published","author":[{"last_name":"Franzke","first_name":"Katharina L.","full_name":"Franzke, Katharina L."},{"id":"468","orcid":"0000-0002-2717-5076","first_name":"Wolf Gero","last_name":"Schmidt","full_name":"Schmidt, Wolf Gero"},{"full_name":"Gerstmann, Uwe","first_name":"Uwe","orcid":"0000-0002-4476-223X","last_name":"Gerstmann","id":"171"}],"publication_identifier":{"issn":["1742-6588","1742-6596"]},"year":"2025","title":"Finite-size and relativistic effects onto hyperfine interaction of muonic hydrogen","doi":"10.1088/1742-6596/3027/1/012001","language":[{"iso":"eng"}],"article_number":"012001","abstract":[{"lang":"eng","text":"Abstract\r\n Muonic hydrogen is an exotic atom where a muon instead of an electron is bound to a proton. The comparably high mass of the muon (≈ 207 · me\r\n ) has two important effects, (i) the reduced mass of the system becomes more important, and (ii) the muon is localized much closer to the nucleus. Thus, muonic hydrogen is not only excellently suitable for evaluating highly precise quantum electrodynamic (QED) calculations, but may also be used for assessing new approaches including finite nuclear size (FNS) effects to evaluate the proton structure and improve calculation schemes for the hyperfine splittings of many-particle systems, as e.g. to be implemented in density functional theory (DFT) software packages. Here, starting from Dirac’s equation we calculate the relativistic hyperfine splitting of the ground state and several excited states of muonic hydrogen analytically for different charge and magnetization models. The FNS related hyperfine shifts are compared with the differences between QED calculations and experimental measurements. This comparison also allows to unravel the role of the reduced mass, which is on one hand crucial in case of muonic atoms, but on the other hand is by no means well defined in relativistic quantum mechanics."}],"publication":"Journal of Physics: Conference Series","issue":"1","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"35"},{"_id":"230"},{"_id":"429"},{"_id":"27"},{"_id":"790"}],"type":"journal_article","date_created":"2025-09-18T11:17:05Z","status":"public","volume":3027,"user_id":"16199","_id":"61353","publisher":"IOP Publishing","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":"166","name":"TRR 142 - Subproject A11"}],"citation":{"ama":"Franzke KL, Schmidt WG, Gerstmann U. Finite-size and relativistic effects onto hyperfine interaction of muonic hydrogen. Journal of Physics: Conference Series. 2025;3027(1). doi:10.1088/1742-6596/3027/1/012001","bibtex":"@article{Franzke_Schmidt_Gerstmann_2025, title={Finite-size and relativistic effects onto hyperfine interaction of muonic hydrogen}, volume={3027}, DOI={10.1088/1742-6596/3027/1/012001}, number={1012001}, journal={Journal of Physics: Conference Series}, publisher={IOP Publishing}, author={Franzke, Katharina L. and Schmidt, Wolf Gero and Gerstmann, Uwe}, year={2025} }","mla":"Franzke, Katharina L., et al. “Finite-Size and Relativistic Effects onto Hyperfine Interaction of Muonic Hydrogen.” Journal of Physics: Conference Series, vol. 3027, no. 1, 012001, IOP Publishing, 2025, doi:10.1088/1742-6596/3027/1/012001.","short":"K.L. Franzke, W.G. Schmidt, U. Gerstmann, Journal of Physics: Conference Series 3027 (2025).","chicago":"Franzke, Katharina L., Wolf Gero Schmidt, and Uwe Gerstmann. “Finite-Size and Relativistic Effects onto Hyperfine Interaction of Muonic Hydrogen.” Journal of Physics: Conference Series 3027, no. 1 (2025). https://doi.org/10.1088/1742-6596/3027/1/012001.","apa":"Franzke, K. L., Schmidt, W. G., & Gerstmann, U. (2025). Finite-size and relativistic effects onto hyperfine interaction of muonic hydrogen. Journal of Physics: Conference Series, 3027(1), Article 012001. https://doi.org/10.1088/1742-6596/3027/1/012001","ieee":"K. L. Franzke, W. G. Schmidt, and U. Gerstmann, “Finite-size and relativistic effects onto hyperfine interaction of muonic hydrogen,” Journal of Physics: Conference Series, vol. 3027, no. 1, Art. no. 012001, 2025, doi: 10.1088/1742-6596/3027/1/012001."}},{"date_created":"2025-09-18T11:09:30Z","type":"conference","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"289"},{"_id":"35"},{"_id":"230"},{"_id":"790"}],"publication":"2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)","citation":{"bibtex":"@inproceedings{Devaraj_Ruiz Alvarado_Lee_Oh_Gerstmann_Schmidt_Zentgraf_2025, title={Dynamic and Reversible Plasmonic Nanogaps From Isolated Dimer Nanoparticles via Self-Assembly}, DOI={10.1109/cleo/europe-eqec65582.2025.11109762}, booktitle={2025 Conference on Lasers and Electro-Optics Europe &amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)}, publisher={IEEE}, author={Devaraj, Vasanthan and Ruiz Alvarado, Isaac Azahel and Lee, Jongmin and Oh, Jin-Woo and Gerstmann, Uwe and Schmidt, Wolf Gero and Zentgraf, Thomas}, year={2025} }","ama":"Devaraj V, Ruiz Alvarado IA, Lee J, et al. Dynamic and Reversible Plasmonic Nanogaps From Isolated Dimer Nanoparticles via Self-Assembly. In: 2025 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE; 2025. doi:10.1109/cleo/europe-eqec65582.2025.11109762","mla":"Devaraj, Vasanthan, et al. “Dynamic and Reversible Plasmonic Nanogaps From Isolated Dimer Nanoparticles via Self-Assembly.” 2025 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC), IEEE, 2025, doi:10.1109/cleo/europe-eqec65582.2025.11109762.","short":"V. Devaraj, I.A. Ruiz Alvarado, J. Lee, J.-W. Oh, U. Gerstmann, W.G. Schmidt, T. Zentgraf, in: 2025 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC), IEEE, 2025.","chicago":"Devaraj, Vasanthan, Isaac Azahel Ruiz Alvarado, Jongmin Lee, Jin-Woo Oh, Uwe Gerstmann, Wolf Gero Schmidt, and Thomas Zentgraf. “Dynamic and Reversible Plasmonic Nanogaps From Isolated Dimer Nanoparticles via Self-Assembly.” In 2025 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2025. https://doi.org/10.1109/cleo/europe-eqec65582.2025.11109762.","ieee":"V. Devaraj et al., “Dynamic and Reversible Plasmonic Nanogaps From Isolated Dimer Nanoparticles via Self-Assembly,” 2025, doi: 10.1109/cleo/europe-eqec65582.2025.11109762.","apa":"Devaraj, V., Ruiz Alvarado, I. A., Lee, J., Oh, J.-W., Gerstmann, U., Schmidt, W. G., & Zentgraf, T. (2025). Dynamic and Reversible Plasmonic Nanogaps From Isolated Dimer Nanoparticles via Self-Assembly. 2025 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC). https://doi.org/10.1109/cleo/europe-eqec65582.2025.11109762"},"_id":"61352","publisher":"IEEE","language":[{"iso":"eng"}],"user_id":"16199","doi":"10.1109/cleo/europe-eqec65582.2025.11109762","year":"2025","title":"Dynamic and Reversible Plasmonic Nanogaps From Isolated Dimer Nanoparticles via Self-Assembly","status":"public","author":[{"id":"103814","full_name":"Devaraj, Vasanthan","first_name":"Vasanthan","last_name":"Devaraj"},{"first_name":"Isaac Azahel","last_name":"Ruiz Alvarado","orcid":"0000-0002-4710-1170","full_name":"Ruiz Alvarado, Isaac Azahel","id":"79462"},{"last_name":"Lee","first_name":"Jongmin","full_name":"Lee, Jongmin"},{"full_name":"Oh, Jin-Woo","last_name":"Oh","first_name":"Jin-Woo"},{"id":"171","full_name":"Gerstmann, Uwe","orcid":"0000-0002-4476-223X","first_name":"Uwe","last_name":"Gerstmann"},{"first_name":"Wolf Gero","last_name":"Schmidt","orcid":"0000-0002-2717-5076","full_name":"Schmidt, Wolf Gero","id":"468"},{"id":"30525","full_name":"Zentgraf, Thomas","first_name":"Thomas","orcid":"0000-0002-8662-1101","last_name":"Zentgraf"}],"publication_status":"published","date_updated":"2025-12-05T13:32:18Z"},{"date_updated":"2025-12-05T13:40:48Z","publication_status":"published","publication_identifier":{"issn":["2198-3844","2198-3844"]},"author":[{"last_name":"Wei","first_name":"Huan","full_name":"Wei, Huan"},{"first_name":"Tong","last_name":"Wu","full_name":"Wu, Tong"},{"last_name":"Dong","first_name":"Chuanding","full_name":"Dong, Chuanding"},{"full_name":"Chen, Chen","first_name":"Chen","last_name":"Chen"},{"first_name":"Zhenqi","last_name":"Gong","full_name":"Gong, Zhenqi"},{"first_name":"Jiangnan","last_name":"Xia","full_name":"Xia, Jiangnan"},{"first_name":"Chengyuan","last_name":"Peng","full_name":"Peng, Chengyuan"},{"last_name":"Ding","first_name":"Jiaqi","full_name":"Ding, Jiaqi"},{"full_name":"Zhang, Yu","first_name":"Yu","last_name":"Zhang"},{"last_name":"Shi","first_name":"Wenpei","full_name":"Shi, Wenpei"},{"orcid":"0000-0003-4042-4951","first_name":"Stefan","last_name":"Schumacher","full_name":"Schumacher, Stefan","id":"27271"},{"last_name":"Zhang","first_name":"Xue","full_name":"Zhang, Xue"},{"last_name":"Bai","first_name":"Yugang","full_name":"Bai, Yugang"},{"full_name":"Jiang, Lang","first_name":"Lang","last_name":"Jiang"},{"full_name":"Liao, Lei","last_name":"Liao","first_name":"Lei"},{"first_name":"Thuc‐Quyen","last_name":"Nguyen","full_name":"Nguyen, Thuc‐Quyen"},{"full_name":"Hu, Yuanyuan","last_name":"Hu","first_name":"Yuanyuan"}],"title":"Efficient n‐Doping of Organic Semiconductors via a Broadly Applicable Nucleophilic‐Attack Mechanism","status":"public","year":"2025","doi":"10.1002/advs.202520487","user_id":"16199","_id":"62866","language":[{"iso":"eng"}],"publisher":"Wiley","article_number":"e20487","abstract":[{"lang":"eng","text":"Abstract\r\n \r\n The development of efficient and broadly applicable n‐doping strategies for organic semiconductors (OSCs) is crucial for advancing the performance of various organic electronic devices. Here, a novel nucleophilic‐attack n‐doping mechanism is unveiled that achieves exceptionally high conductivity in doped OSC films and demonstrates broad applicability across OSCs. The remarkable efficacy of n‐Butyl lithium (n‐BuLi) is highlighted in n‐doping C\r\n 60\r\n and PC\r\n 61\r\n BM, achieving a conductivity of 1.27 S cm\r\n −1\r\n and 2.57 S cm\r\n −1\r\n , respectively, which are among the highest reported values for these materials. The investigation reveals that the n‐BuLi anion interacts with electron‐deficient units in OSCs, generating a carbanion that facilitates efficient electron transfer for n‐doping. This mechanism is further validated across diverse fullerenes, polymeric, and small molecule OSCs, and is extendable to other high‐performance dopants such as tert‐Butyllithium (tert‐BuLi) and sodium ethoxide (NaOEt). Device studies show that n‐BuLi‐doped C\r\n 60\r\n enables substantially improved diode rectification, attributed to greater junction built‐in potential. These findings establish a unified chemical‐bonding‐based n‐doping paradigm, complementing existing electrophilic‐attack p‐doping concepts, and pave the way for achieving efficient doping of OSCs for advanced organic electronic applications.\r\n "}],"citation":{"bibtex":"@article{Wei_Wu_Dong_Chen_Gong_Xia_Peng_Ding_Zhang_Shi_et al._2025, title={Efficient n‐Doping of Organic Semiconductors via a Broadly Applicable Nucleophilic‐Attack Mechanism}, DOI={10.1002/advs.202520487}, number={e20487}, journal={Advanced Science}, publisher={Wiley}, author={Wei, Huan and Wu, Tong and Dong, Chuanding and Chen, Chen and Gong, Zhenqi and Xia, Jiangnan and Peng, Chengyuan and Ding, Jiaqi and Zhang, Yu and Shi, Wenpei and et al.}, year={2025} }","ama":"Wei H, Wu T, Dong C, et al. Efficient n‐Doping of Organic Semiconductors via a Broadly Applicable Nucleophilic‐Attack Mechanism. Advanced Science. Published online 2025. doi:10.1002/advs.202520487","mla":"Wei, Huan, et al. “Efficient N‐Doping of Organic Semiconductors via a Broadly Applicable Nucleophilic‐Attack Mechanism.” Advanced Science, e20487, Wiley, 2025, doi:10.1002/advs.202520487.","chicago":"Wei, Huan, Tong Wu, Chuanding Dong, Chen Chen, Zhenqi Gong, Jiangnan Xia, Chengyuan Peng, et al. “Efficient N‐Doping of Organic Semiconductors via a Broadly Applicable Nucleophilic‐Attack Mechanism.” Advanced Science, 2025. https://doi.org/10.1002/advs.202520487.","short":"H. Wei, T. Wu, C. Dong, C. Chen, Z. Gong, J. Xia, C. Peng, J. Ding, Y. Zhang, W. Shi, S. Schumacher, X. Zhang, Y. Bai, L. Jiang, L. Liao, T. Nguyen, Y. Hu, Advanced Science (2025).","ieee":"H. Wei et al., “Efficient n‐Doping of Organic Semiconductors via a Broadly Applicable Nucleophilic‐Attack Mechanism,” Advanced Science, Art. no. e20487, 2025, doi: 10.1002/advs.202520487.","apa":"Wei, H., Wu, T., Dong, C., Chen, C., Gong, Z., Xia, J., Peng, C., Ding, J., Zhang, Y., Shi, W., Schumacher, S., Zhang, X., Bai, Y., Jiang, L., Liao, L., Nguyen, T., & Hu, Y. (2025). Efficient n‐Doping of Organic Semiconductors via a Broadly Applicable Nucleophilic‐Attack Mechanism. Advanced Science, Article e20487. https://doi.org/10.1002/advs.202520487"},"publication":"Advanced Science","department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"705"},{"_id":"35"},{"_id":"230"}],"type":"journal_article","date_created":"2025-12-04T12:30:39Z"},{"date_updated":"2025-12-05T13:55:48Z","author":[{"full_name":"Wingenbach, Jan","first_name":"Jan","last_name":"Wingenbach","id":"69187"},{"last_name":"Ares Santos","first_name":"Laura ","full_name":"Ares Santos, Laura "},{"last_name":"Ma","first_name":"Xuekai","full_name":"Ma, Xuekai","id":"59416"},{"orcid":"0000-0002-5844-3205","first_name":"Jan","last_name":"Sperling","full_name":"Sperling, Jan","id":"75127"},{"id":"27271","full_name":"Schumacher, Stefan","last_name":"Schumacher","orcid":"0000-0003-4042-4951","first_name":"Stefan"}],"year":"2025","status":"public","title":"Sensitivity and Topology of Exceptional Rings in Nonlinear Non-Hermitian Planar Optical Microcavities","doi":"10.48550/ARXIV.2507.07099","user_id":"16199","language":[{"iso":"eng"}],"_id":"60992","publisher":"Arxiv","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"},{"name":"TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen Systemen: Eine theoretische Analyse","_id":"174"},{"_id":"56","name":"TRR 142 - Project Area C"}],"abstract":[{"lang":"eng","text":"Non-Hermitian systems hosting exceptional points (EPs) exhibit enhanced sensitivity and unconventional mode dynamics. Going beyond isolated EPs, here we report on the existence of exceptional rings (ERs) in planar optical resonators with specific form of circular dichroism and TE-TM splitting. Such exceptional rings possess intriguing topologies as discussed earlier for condensed matter systems, but they remain virtually unexplored in presence of nonlinearity, for which our photonic platform is ideal. We find that when Kerr-type nonlinearity (or saturable gain) is introduced, the linear ER splits into two concentric ERs, with the larger-radius ring being a ring of third-order EPs. Transitioning from linear to nonlinear regime, we present a rigorous analysis of spectral topology and report enhanced and adjustable perturbation response in the nonlinear regime. Whereas certain features are specific to our system, the results on non-Hermitian spectral topology and nonlinearity-enhanced perturbation response are generic and equally relevant to a broad class of other nonlinear non-Hermitian systems, providing a universal framework for engineering ERs and EPs in nonlinear non-Hermitian systems."}],"citation":{"mla":"Wingenbach, Jan, et al. “Sensitivity and Topology of Exceptional Rings in Nonlinear Non-Hermitian Planar Optical Microcavities.” Arxiv, Arxiv, 2025, doi:10.48550/ARXIV.2507.07099.","bibtex":"@article{Wingenbach_Ares Santos_Ma_Sperling_Schumacher_2025, title={Sensitivity and Topology of Exceptional Rings in Nonlinear Non-Hermitian Planar Optical Microcavities}, DOI={10.48550/ARXIV.2507.07099}, journal={Arxiv}, publisher={Arxiv}, author={Wingenbach, Jan and Ares Santos, Laura and Ma, Xuekai and Sperling, Jan and Schumacher, Stefan}, year={2025} }","ama":"Wingenbach J, Ares Santos L, Ma X, Sperling J, Schumacher S. Sensitivity and Topology of Exceptional Rings in Nonlinear Non-Hermitian Planar Optical Microcavities. Arxiv. Published online 2025. doi:10.48550/ARXIV.2507.07099","ieee":"J. Wingenbach, L. Ares Santos, X. Ma, J. Sperling, and S. Schumacher, “Sensitivity and Topology of Exceptional Rings in Nonlinear Non-Hermitian Planar Optical Microcavities,” Arxiv, 2025, doi: 10.48550/ARXIV.2507.07099.","apa":"Wingenbach, J., Ares Santos, L., Ma, X., Sperling, J., & Schumacher, S. (2025). Sensitivity and Topology of Exceptional Rings in Nonlinear Non-Hermitian Planar Optical Microcavities. Arxiv. https://doi.org/10.48550/ARXIV.2507.07099","chicago":"Wingenbach, Jan, Laura Ares Santos, Xuekai Ma, Jan Sperling, and Stefan Schumacher. “Sensitivity and Topology of Exceptional Rings in Nonlinear Non-Hermitian Planar Optical Microcavities.” Arxiv, 2025. https://doi.org/10.48550/ARXIV.2507.07099.","short":"J. Wingenbach, L. Ares Santos, X. Ma, J. Sperling, S. Schumacher, Arxiv (2025)."},"publication":"Arxiv","department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"706"},{"_id":"705"},{"_id":"35"},{"_id":"230"},{"_id":"429"},{"_id":"27"}],"type":"journal_article","date_created":"2025-08-25T11:15:22Z"},{"publication":"Advanced Functional Materials","citation":{"ama":"Patra A, Konrad P, Sperlich A, et al. Quantifying Spin Defect Density in hBN via Raman and Photoluminescence Analysis. Advanced Functional Materials. Published online 2025. doi:10.1002/adfm.202517851","bibtex":"@article{Patra_Konrad_Sperlich_Biktagirov_Schmidt_Spencer_Aharonovich_Höfling_Dyakonov_2025, title={Quantifying Spin Defect Density in hBN via Raman and Photoluminescence Analysis}, DOI={10.1002/adfm.202517851}, number={e17851}, journal={Advanced Functional Materials}, publisher={Wiley}, author={Patra, Atanu and Konrad, Paul and Sperlich, Andreas and Biktagirov, Timur and Schmidt, Wolf Gero and Spencer, Lesley and Aharonovich, Igor and Höfling, Sven and Dyakonov, Vladimir}, year={2025} }","mla":"Patra, Atanu, et al. “Quantifying Spin Defect Density in HBN via Raman and Photoluminescence Analysis.” Advanced Functional Materials, e17851, Wiley, 2025, doi:10.1002/adfm.202517851.","short":"A. Patra, P. Konrad, A. Sperlich, T. Biktagirov, W.G. Schmidt, L. Spencer, I. Aharonovich, S. Höfling, V. Dyakonov, Advanced Functional Materials (2025).","chicago":"Patra, Atanu, Paul Konrad, Andreas Sperlich, Timur Biktagirov, Wolf Gero Schmidt, Lesley Spencer, Igor Aharonovich, Sven Höfling, and Vladimir Dyakonov. “Quantifying Spin Defect Density in HBN via Raman and Photoluminescence Analysis.” Advanced Functional Materials, 2025. https://doi.org/10.1002/adfm.202517851.","apa":"Patra, A., Konrad, P., Sperlich, A., Biktagirov, T., Schmidt, W. G., Spencer, L., Aharonovich, I., Höfling, S., & Dyakonov, V. (2025). Quantifying Spin Defect Density in hBN via Raman and Photoluminescence Analysis. Advanced Functional Materials, Article e17851. https://doi.org/10.1002/adfm.202517851","ieee":"A. Patra et al., “Quantifying Spin Defect Density in hBN via Raman and Photoluminescence Analysis,” Advanced Functional Materials, Art. no. e17851, 2025, doi: 10.1002/adfm.202517851."},"abstract":[{"lang":"eng","text":"Abstract\r\n \r\n Negatively charged boron vacancies () in hexagonal boron nitride (hBN) are emerging as promising solid‐state spin qubits due to their optical accessibility, structural simplicity, and compatibility with photonic platforms. However, quantifying the density of such defects in thin hBN flakes has remained elusive, limiting progress in device integration and reproducibility. Here, an all‐optical method is presented to quantify defect density in hBN by correlating Raman and photoluminescence (PL) signatures with irradiation fluence. Two defect‐induced Raman modes, D1 and D2, are identified and assigned them to vibrational modes of using polarization‐resolved Raman measurements and density functional theory (DFT) calculations. By adapting a numerical model originally developed for graphene, an empirical relationship linking Raman (D1,\r\n E\r\n 2g\r\n ) and PL intensities is established to absolute defect densities. This method is universally applicable across various irradiation types and uniquely suited for thin flakes, where conventional techniques fail. The approach enables accurate, direct, and non‐destructive quantification of spin defect densities down to 10\r\n 15\r\n defects/cm\r\n 3\r\n , offering a powerful tool for optimizing and benchmarking hBN for quantum optical applications.\r\n "}],"project":[{"name":"Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"date_created":"2025-12-05T14:15:35Z","type":"journal_article","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"35"},{"_id":"230"},{"_id":"27"}],"year":"2025","status":"public","title":"Quantifying Spin Defect Density in hBN via Raman and Photoluminescence Analysis","publication_identifier":{"issn":["1616-301X","1616-3028"]},"author":[{"first_name":"Atanu","last_name":"Patra","full_name":"Patra, Atanu"},{"full_name":"Konrad, Paul","last_name":"Konrad","first_name":"Paul"},{"full_name":"Sperlich, Andreas","last_name":"Sperlich","first_name":"Andreas"},{"full_name":"Biktagirov, Timur","first_name":"Timur","last_name":"Biktagirov","id":"65612"},{"id":"468","full_name":"Schmidt, Wolf Gero","orcid":"0000-0002-2717-5076","first_name":"Wolf Gero","last_name":"Schmidt"},{"first_name":"Lesley","last_name":"Spencer","full_name":"Spencer, Lesley"},{"full_name":"Aharonovich, Igor","last_name":"Aharonovich","first_name":"Igor"},{"full_name":"Höfling, Sven","first_name":"Sven","last_name":"Höfling"},{"last_name":"Dyakonov","first_name":"Vladimir","full_name":"Dyakonov, Vladimir"}],"publication_status":"published","date_updated":"2025-12-05T14:18:27Z","article_number":"e17851","_id":"62926","publisher":"Wiley","language":[{"iso":"eng"}],"user_id":"16199","doi":"10.1002/adfm.202517851"},{"abstract":[{"text":"We introduce a new classification of multimode states with a fixed number of photons. This classification is based on the factorizability of homogeneous multivariate polynomials and is invariant under unitary transformations. The classes physically correspond to field excitations in terms of single and multiple photons, each of which is in an arbitrary irreducible superposition of quantized modes. We further show how the transitions between classes are rendered possible by photon addition, photon subtraction, and photon-projection nonlinearities. We explicitly put forward a design for a multilayer interferometer in which the states for different classes can be generated with state-of-the-art experimental techniques. Limitations of the proposed designs are analyzed using the introduced classification, providing a benchmark for the robustness of certain states and classes.","lang":"eng"}],"issue":"3","publication":"Physical Review Research","department":[{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"293"},{"_id":"706"},{"_id":"636"},{"_id":"35"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"type":"journal_article","date_created":"2025-12-09T09:08:39Z","intvolume":" 7","date_updated":"2025-12-09T09:10:01Z","publication_status":"published","publication_identifier":{"issn":["2643-1564"]},"author":[{"full_name":"Kopylov, Denis A.","last_name":"Kopylov","first_name":"Denis A."},{"id":"85279","orcid":"0000-0002-5940-8057","first_name":"Christian","last_name":"Offen","full_name":"Offen, Christian"},{"last_name":"Ares","first_name":"Laura","full_name":"Ares, Laura"},{"id":"95394","full_name":"Wembe Moafo, Boris Edgar","last_name":"Wembe Moafo","first_name":"Boris Edgar"},{"first_name":"Sina","last_name":"Ober-Blöbaum","full_name":"Ober-Blöbaum, Sina","id":"16494"},{"id":"344","full_name":"Meier, Torsten","last_name":"Meier","orcid":"0000-0001-8864-2072","first_name":"Torsten"},{"id":"60286","full_name":"Sharapova, Polina R.","first_name":"Polina R.","last_name":"Sharapova"},{"id":"75127","full_name":"Sperling, Jan","orcid":"0000-0002-5844-3205","first_name":"Jan","last_name":"Sperling"}],"year":"2025","title":"Multiphoton, multimode state classification for nonlinear optical circuits","doi":"10.1103/sv6z-v1gk","language":[{"iso":"eng"}],"article_number":"033062","project":[{"_id":"53","name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"},{"name":"TRR 142 - Project Area C","_id":"56"},{"name":"TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen Systemen: Eine theoretische Analyse","_id":"174"},{"name":"PhoQC: Photonisches Quantencomputing","_id":"266"}],"citation":{"ieee":"D. A. Kopylov et al., “Multiphoton, multimode state classification for nonlinear optical circuits,” Physical Review Research, vol. 7, no. 3, Art. no. 033062, 2025, doi: 10.1103/sv6z-v1gk.","apa":"Kopylov, D. A., Offen, C., Ares, L., Wembe Moafo, B. E., Ober-Blöbaum, S., Meier, T., Sharapova, P. R., & Sperling, J. (2025). Multiphoton, multimode state classification for nonlinear optical circuits. Physical Review Research, 7(3), Article 033062. https://doi.org/10.1103/sv6z-v1gk","chicago":"Kopylov, Denis A., Christian Offen, Laura Ares, Boris Edgar Wembe Moafo, Sina Ober-Blöbaum, Torsten Meier, Polina R. Sharapova, and Jan Sperling. “Multiphoton, Multimode State Classification for Nonlinear Optical Circuits.” Physical Review Research 7, no. 3 (2025). https://doi.org/10.1103/sv6z-v1gk.","short":"D.A. Kopylov, C. Offen, L. Ares, B.E. Wembe Moafo, S. Ober-Blöbaum, T. Meier, P.R. Sharapova, J. Sperling, Physical Review Research 7 (2025).","mla":"Kopylov, Denis A., et al. “Multiphoton, Multimode State Classification for Nonlinear Optical Circuits.” Physical Review Research, vol. 7, no. 3, 033062, American Physical Society (APS), 2025, doi:10.1103/sv6z-v1gk.","bibtex":"@article{Kopylov_Offen_Ares_Wembe Moafo_Ober-Blöbaum_Meier_Sharapova_Sperling_2025, title={Multiphoton, multimode state classification for nonlinear optical circuits}, volume={7}, DOI={10.1103/sv6z-v1gk}, number={3033062}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Kopylov, Denis A. and Offen, Christian and Ares, Laura and Wembe Moafo, Boris Edgar and Ober-Blöbaum, Sina and Meier, Torsten and Sharapova, Polina R. and Sperling, Jan}, year={2025} }","ama":"Kopylov DA, Offen C, Ares L, et al. Multiphoton, multimode state classification for nonlinear optical circuits. Physical Review Research. 2025;7(3). doi:10.1103/sv6z-v1gk"},"status":"public","volume":7,"user_id":"16199","publisher":"American Physical Society (APS)","_id":"62980"},{"ipc":"US20250172751A1","citation":{"mla":"Güsken, Nicholas Alexander. Beam Steering Device and Electronic Apparatus Including the Same. 2025.","bibtex":"@article{Güsken_2025, title={Beam steering device and electronic apparatus including the same}, author={Güsken, Nicholas Alexander}, year={2025} }","ama":"Güsken NA. Beam steering device and electronic apparatus including the same. Published online 2025.","ieee":"N. A. Güsken, “Beam steering device and electronic apparatus including the same.” 2025.","apa":"Güsken, N. A. (2025). Beam steering device and electronic apparatus including the same.","chicago":"Güsken, Nicholas Alexander. “Beam Steering Device and Electronic Apparatus Including the Same,” 2025.","short":"N.A. Güsken, (2025)."},"type":"patent","department":[{"_id":"623"},{"_id":"15"},{"_id":"230"}],"application_number":"18957248","date_created":"2025-12-11T20:43:18Z","date_updated":"2025-12-11T20:46:30Z","ipn":"18957248","title":"Beam steering device and electronic apparatus including the same","status":"public","year":"2025","author":[{"id":"112030","full_name":"Güsken, Nicholas Alexander","first_name":"Nicholas Alexander","orcid":"0000-0002-4816-0666","last_name":"Güsken"}],"publication_date":"2025/05/29","user_id":"112030","_id":"63050"}]