---
_id: '62862'
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.
article_number: '121103'
author:
- first_name: Qiang
full_name: Ai, Qiang
last_name: Ai
- first_name: Xuekai
full_name: Ma, Xuekai
id: '59416'
last_name: Ma
- first_name: Franziska
full_name: Barkhausen, Franziska
id: '63631'
last_name: Barkhausen
- first_name: Xiaokun
full_name: Zhai, Xiaokun
last_name: Zhai
- first_name: Chunzi
full_name: Xing, Chunzi
last_name: Xing
- first_name: Xinmiao
full_name: Yang, Xinmiao
last_name: Yang
- first_name: Peilin
full_name: Wang, Peilin
last_name: Wang
- first_name: Tianyu
full_name: Liu, Tianyu
last_name: Liu
- first_name: Yong
full_name: Zhang, Yong
last_name: Zhang
- first_name: Yazhou
full_name: Gu, Yazhou
last_name: Gu
- first_name: Peigang
full_name: Li, Peigang
last_name: Li
- first_name: Zhitong
full_name: Li, Zhitong
last_name: Li
- first_name: Zacharias
full_name: Hatzopoulos, Zacharias
last_name: Hatzopoulos
- first_name: Pavlos G.
full_name: Savvidis, Pavlos G.
last_name: Savvidis
- first_name: Stefan
full_name: Schumacher, Stefan
id: '27271'
last_name: Schumacher
orcid: 0000-0003-4042-4951
- first_name: Tingge
full_name: Gao, Tingge
last_name: Gao
citation:
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
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
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} }'
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.
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.'
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.
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).
date_created: 2025-12-04T12:25:12Z
date_updated: 2025-12-04T12:27:02Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '705'
- _id: '35'
- _id: '230'
- _id: '27'
doi: 10.1063/5.0287076
intvolume: ' 127'
issue: '12'
language:
- iso: eng
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: Applied Physics Letters
publication_identifier:
issn:
- 0003-6951
- 1077-3118
publication_status: published
publisher: AIP Publishing
status: public
title: Tuning polariton vortices in an asymmetric ring potential
type: journal_article
user_id: '16199'
volume: 127
year: '2025'
...
---
_id: '62865'
article_number: '115305'
author:
- first_name: Jinming
full_name: Sun, Jinming
last_name: Sun
- first_name: Manna
full_name: Chen, Manna
last_name: Chen
- first_name: Stefan
full_name: Schumacher, Stefan
id: '27271'
last_name: Schumacher
orcid: 0000-0003-4042-4951
- first_name: Wei
full_name: Hu, Wei
last_name: Hu
- first_name: Xuekai
full_name: Ma, Xuekai
id: '59416'
last_name: Ma
citation:
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
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
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}
}'
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.
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.'
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.
short: J. Sun, M. Chen, S. Schumacher, W. Hu, X. Ma, Physical Review B 112 (2025).
date_created: 2025-12-04T12:28:52Z
date_updated: 2025-12-04T12:29:37Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '705'
- _id: '35'
- _id: '230'
doi: 10.1103/p357-vyq8
intvolume: ' 112'
issue: '11'
language:
- iso: eng
publication: Physical Review B
publication_identifier:
issn:
- 2469-9950
- 2469-9969
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Higher-order dark solitons and control dynamics in microcavity polariton condensates
type: journal_article
user_id: '16199'
volume: 112
year: '2025'
...
---
_id: '62860'
abstract:
- lang: eng
text: "\r\n The Quantum Internet, a network of quantum-enabled
infrastructure, represents the next frontier in telecommunications, promising
capabilities that cannot be attained by classical counterparts. A crucial step
in realizing such large-scale quantum networks is the integration of entanglement
distribution within existing telecommunication infrastructure. Here, we demonstrate
a real-world scalable quantum networking testbed deployed within Deutsche Telekom’s
metropolitan fibers in Berlin. Using commercially available quantum devices and
standard add-drop multiplexing hardware, we distributed polarization-entangled
photon pairs over dynamically selectable looped fiber paths ranging from 10 m
to 60 km and showed entanglement distribution over up to approximately 100 km.
Quantum signals, transmitted at 1324 nm (O-band), coexist with conventional bidirectional
C-band traffic without dedicated fibers or infrastructure changes. Active stabilization
of the polarization enables robust long-term performance, achieving entanglement
Bell-state fidelity bounds between 85% and 99% and Clauser–Horne–Shimony–Holt
parameter\r\n S\r\n -values
between 2.36 and 2.74 during continuous multiday operation. By achieving a high-fidelity
entanglement distribution with less than 1.5% downtime, we confirm the feasibility
of hybrid quantum-classical networks under real-world conditions at the metropolitan
scale. These results establish deployment benchmarks and provide a practical roadmap
for telecom operators to integrate quantum capabilities.\r\n "
article_number: '1072'
author:
- first_name: Matheus
full_name: Sena, Matheus
last_name: Sena
- first_name: Mael
full_name: Flament, Mael
last_name: Flament
- first_name: Shane
full_name: Andrewski, Shane
last_name: Andrewski
- first_name: Ioannis
full_name: Caltzidis, Ioannis
last_name: Caltzidis
- first_name: Niccolò
full_name: Bigagli, Niccolò
last_name: Bigagli
- first_name: Thomas
full_name: Rieser, Thomas
last_name: Rieser
- first_name: Gabriel
full_name: Bello Portmann, Gabriel
last_name: Bello Portmann
- first_name: Rourke
full_name: Sekelsky, Rourke
last_name: Sekelsky
- first_name: Ralf-Peter
full_name: Braun, Ralf-Peter
last_name: Braun
- first_name: Alexander N.
full_name: Craddock, Alexander N.
last_name: Craddock
- first_name: Maximilian
full_name: Schulz, Maximilian
last_name: Schulz
- first_name: Klaus
full_name: Jöns, Klaus
id: '85353'
last_name: Jöns
- first_name: Michaela
full_name: Ritter, Michaela
last_name: Ritter
- first_name: Marc
full_name: Geitz, Marc
last_name: Geitz
- first_name: Oliver
full_name: Holschke, Oliver
last_name: Holschke
- first_name: Mehdi
full_name: Namazi, Mehdi
last_name: Namazi
citation:
ama: Sena M, Flament M, Andrewski S, et al. High-fidelity quantum entanglement distribution
in metropolitan fiber networks with co-propagating classical traffic. Journal
of Optical Communications and Networking. 2025;17(12). doi:10.1364/jocn.575396
apa: Sena, M., Flament, M., Andrewski, S., Caltzidis, I., Bigagli, N., Rieser, T.,
Bello Portmann, G., Sekelsky, R., Braun, R.-P., Craddock, A. N., Schulz, M., Jöns,
K., Ritter, M., Geitz, M., Holschke, O., & Namazi, M. (2025). High-fidelity
quantum entanglement distribution in metropolitan fiber networks with co-propagating
classical traffic. Journal of Optical Communications and Networking, 17(12),
Article 1072. https://doi.org/10.1364/jocn.575396
bibtex: '@article{Sena_Flament_Andrewski_Caltzidis_Bigagli_Rieser_Bello Portmann_Sekelsky_Braun_Craddock_et
al._2025, title={High-fidelity quantum entanglement distribution in metropolitan
fiber networks with co-propagating classical traffic}, volume={17}, DOI={10.1364/jocn.575396},
number={121072}, journal={Journal of Optical Communications and Networking}, publisher={Optica
Publishing Group}, author={Sena, Matheus and Flament, Mael and Andrewski, Shane
and Caltzidis, Ioannis and Bigagli, Niccolò and Rieser, Thomas and Bello Portmann,
Gabriel and Sekelsky, Rourke and Braun, Ralf-Peter and Craddock, Alexander N.
and et al.}, year={2025} }'
chicago: Sena, Matheus, Mael Flament, Shane Andrewski, Ioannis Caltzidis, Niccolò
Bigagli, Thomas Rieser, Gabriel Bello Portmann, et al. “High-Fidelity Quantum
Entanglement Distribution in Metropolitan Fiber Networks with Co-Propagating Classical
Traffic.” Journal of Optical Communications and Networking 17, no. 12 (2025).
https://doi.org/10.1364/jocn.575396.
ieee: 'M. Sena et al., “High-fidelity quantum entanglement distribution in
metropolitan fiber networks with co-propagating classical traffic,” Journal
of Optical Communications and Networking, vol. 17, no. 12, Art. no. 1072,
2025, doi: 10.1364/jocn.575396.'
mla: Sena, Matheus, et al. “High-Fidelity Quantum Entanglement Distribution in Metropolitan
Fiber Networks with Co-Propagating Classical Traffic.” Journal of Optical Communications
and Networking, vol. 17, no. 12, 1072, Optica Publishing Group, 2025, doi:10.1364/jocn.575396.
short: M. Sena, M. Flament, S. Andrewski, I. Caltzidis, N. Bigagli, T. Rieser, G.
Bello Portmann, R. Sekelsky, R.-P. Braun, A.N. Craddock, M. Schulz, K. Jöns, M.
Ritter, M. Geitz, O. Holschke, M. Namazi, Journal of Optical Communications and
Networking 17 (2025).
date_created: 2025-12-04T12:20:01Z
date_updated: 2025-12-04T13:37:02Z
department:
- _id: '623'
- _id: '15'
doi: 10.1364/jocn.575396
intvolume: ' 17'
issue: '12'
language:
- iso: eng
publication: Journal of Optical Communications and Networking
publication_identifier:
issn:
- 1943-0620
- 1943-0639
publication_status: published
publisher: Optica Publishing Group
status: public
title: High-fidelity quantum entanglement distribution in metropolitan fiber networks
with co-propagating classical traffic
type: journal_article
user_id: '85353'
volume: 17
year: '2025'
...
---
_id: '62912'
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.
article_number: '013141'
author:
- first_name: Usman
full_name: Ali, Usman
last_name: Ali
- first_name: Martin
full_name: Holthaus, Martin
last_name: Holthaus
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
citation:
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'
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'
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}
}'
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.'
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.'
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.'
short: U. Ali, M. Holthaus, T. Meier, Physical Review Research 7 (2025).
date_created: 2025-12-05T09:36:31Z
date_updated: 2025-12-05T09:37:10Z
department:
- _id: '15'
- _id: '170'
- _id: '293'
- _id: '230'
- _id: '35'
doi: 10.1103/physrevresearch.7.013141
intvolume: ' 7'
issue: '1'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
issn:
- 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Wave packet dynamics in parabolic optical lattices: From Bloch oscillations
to long-range dynamical tunneling'
type: journal_article
user_id: '16199'
volume: 7
year: '2025'
...
---
_id: '62911'
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.
article_number: '033122'
author:
- first_name: Denis A.
full_name: Kopylov, Denis A.
last_name: Kopylov
- first_name: Michael
full_name: Stefszky, Michael
id: '42777'
last_name: Stefszky
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
- first_name: Polina R.
full_name: Sharapova, Polina R.
id: '60286'
last_name: Sharapova
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'
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'
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} }'
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.'
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.'
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.'
short: D.A. Kopylov, M. Stefszky, T. Meier, C. Silberhorn, P.R. Sharapova, Physical
Review Research 7 (2025).
date_created: 2025-12-05T09:33:36Z
date_updated: 2025-12-05T09:55:22Z
department:
- _id: '15'
- _id: '569'
- _id: '170'
- _id: '293'
- _id: '288'
- _id: '230'
- _id: '623'
- _id: '429'
- _id: '35'
doi: 10.1103/zp72-7qwl
intvolume: ' 7'
issue: '3'
language:
- iso: eng
project:
- _id: '266'
name: 'PhoQC: Photonisches Quantencomputing'
- _id: '53'
name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten
zu funktionellen Strukturen'
- _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'
publication: Physical Review Research
publication_identifier:
issn:
- 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Spectral and temporal properties of type-II parametric down-conversion: The
impact of losses during state generation'
type: journal_article
user_id: '16199'
volume: 7
year: '2025'
...
---
_id: '62913'
author:
- first_name: Anna
full_name: Hunstig, Anna
id: '73659'
last_name: Hunstig
- first_name: Sebastian
full_name: Peitz, Sebastian
id: '47427'
last_name: Peitz
orcid: 0000-0002-3389-793X
- first_name: Hendrik
full_name: Rose, Hendrik
id: '55958'
last_name: Rose
orcid: 0000-0002-3079-5428
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
citation:
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'
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} }'
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.
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.'
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.
short: 'A. Hunstig, S. Peitz, H. Rose, T. Meier, in: 2024 IEEE 63rd Conference on
Decision and Control (CDC), IEEE, 2025.'
date_created: 2025-12-05T09:37:58Z
date_updated: 2025-12-05T09:40:24Z
department:
- _id: '15'
- _id: '170'
- _id: '293'
- _id: '230'
- _id: '623'
- _id: '35'
doi: 10.1109/cdc56724.2024.10886589
language:
- iso: eng
project:
- _id: '266'
name: 'PhoQC: Photonisches Quantencomputing'
publication: 2024 IEEE 63rd Conference on Decision and Control (CDC)
publication_status: published
publisher: IEEE
status: public
title: Accelerating the analysis of optical quantum systems using the Koopman operator
type: conference
user_id: '16199'
year: '2025'
...
---
_id: '62920'
author:
- first_name: Marvin Lee
full_name: Fox, Marvin Lee
id: '80773'
last_name: Fox
- first_name: Hendrik
full_name: Peeters, Hendrik
id: '49942'
last_name: Peeters
orcid: https://orcid.org/ 0000-0002-7143-3781
- first_name: Sabine
full_name: Fechner, Sabine
id: '54823'
last_name: Fechner
orcid: 0000-0001-5645-5870
citation:
ama: 'Fox ML, Peeters H, Fechner S. KI-Einsatz durch Lernende im Erkenntnisgewinnungsprozess
- ein Review. In: GDCP Jahrestagung. ; 2025.'
apa: Fox, M. L., Peeters, H., & Fechner, S. (2025). KI-Einsatz durch Lernende
im Erkenntnisgewinnungsprozess - ein Review. GDCP Jahrestagung. GDCP Jahrestagung,
Frankfurt.
bibtex: '@inproceedings{Fox_Peeters_Fechner_2025, title={KI-Einsatz durch Lernende
im Erkenntnisgewinnungsprozess - ein Review}, booktitle={GDCP Jahrestagung}, author={Fox,
Marvin Lee and Peeters, Hendrik and Fechner, Sabine}, year={2025} }'
chicago: Fox, Marvin Lee, Hendrik Peeters, and Sabine Fechner. “KI-Einsatz Durch
Lernende Im Erkenntnisgewinnungsprozess - Ein Review.” In GDCP Jahrestagung,
2025.
ieee: M. L. Fox, H. Peeters, and S. Fechner, “KI-Einsatz durch Lernende im Erkenntnisgewinnungsprozess
- ein Review,” presented at the GDCP Jahrestagung, Frankfurt, 2025.
mla: Fox, Marvin Lee, et al. “KI-Einsatz Durch Lernende Im Erkenntnisgewinnungsprozess
- Ein Review.” GDCP Jahrestagung, 2025.
short: 'M.L. Fox, H. Peeters, S. Fechner, in: GDCP Jahrestagung, 2025.'
conference:
end_date: 2025-09-11
location: Frankfurt
name: GDCP Jahrestagung
start_date: 2025-09-08
date_created: 2025-12-05T12:53:09Z
date_updated: 2025-12-05T13:05:59Z
department:
- _id: '386'
- _id: '33'
keyword:
- Artificial intelligence
- education
- chemistry
language:
- iso: eng
publication: GDCP Jahrestagung
status: public
title: KI-Einsatz durch Lernende im Erkenntnisgewinnungsprozess - ein Review
type: conference_abstract
user_id: '54823'
year: '2025'
...
---
_id: '60568'
article_number: '122776'
author:
- first_name: Adriana
full_name: Bocchini, Adriana
id: '58349'
last_name: Bocchini
orcid: 0000-0002-2134-3075
- first_name: S.
full_name: Kollmann, S.
last_name: Kollmann
- 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: Guido
full_name: Grundmeier, Guido
id: '194'
last_name: Grundmeier
citation:
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
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
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} }'
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.'
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).
date_created: 2025-07-09T09:23:04Z
date_updated: 2025-12-05T13:34:10Z
department:
- _id: '15'
- _id: '2'
- _id: '230'
- _id: '295'
- _id: '790'
- _id: '302'
- _id: '429'
- _id: '35'
- _id: '170'
- _id: '27'
doi: 10.1016/j.susc.2025.122776
intvolume: ' 760'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1016/j.susc.2025.122776
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: Surface Science
publication_identifier:
issn:
- 0039-6028
publication_status: published
publisher: Elsevier BV
status: public
title: Phosphonic acid adsorption on α-Bi2O3
surfaces
type: journal_article
user_id: '16199'
volume: 760
year: '2025'
...
---
_id: '61353'
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."
article_number: '012001'
author:
- first_name: Katharina L.
full_name: Franzke, Katharina L.
last_name: Franzke
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
- first_name: Uwe
full_name: Gerstmann, Uwe
id: '171'
last_name: Gerstmann
orcid: 0000-0002-4476-223X
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'
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'
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} }'
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.'
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.'
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).'
date_created: 2025-09-18T11:17:05Z
date_updated: 2025-12-05T13:32:45Z
department:
- _id: '15'
- _id: '170'
- _id: '295'
- _id: '35'
- _id: '230'
- _id: '429'
- _id: '27'
- _id: '790'
doi: 10.1088/1742-6596/3027/1/012001
intvolume: ' 3027'
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: '166'
name: TRR 142 - Subproject A11
publication: 'Journal of Physics: Conference Series'
publication_identifier:
issn:
- 1742-6588
- 1742-6596
publication_status: published
publisher: IOP Publishing
status: public
title: Finite-size and relativistic effects onto hyperfine interaction of muonic hydrogen
type: journal_article
user_id: '16199'
volume: 3027
year: '2025'
...
---
_id: '61352'
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: Jongmin
full_name: Lee, Jongmin
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, 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'
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
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} }'
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.'
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.'
date_created: 2025-09-18T11:09:30Z
date_updated: 2025-12-05T13:32:18Z
department:
- _id: '15'
- _id: '170'
- _id: '295'
- _id: '289'
- _id: '35'
- _id: '230'
- _id: '790'
doi: 10.1109/cleo/europe-eqec65582.2025.11109762
language:
- iso: eng
publication: 2025 Conference on Lasers and Electro-Optics Europe & European
Quantum Electronics Conference (CLEO/Europe-EQEC)
publication_status: published
publisher: IEEE
status: public
title: Dynamic and Reversible Plasmonic Nanogaps From Isolated Dimer Nanoparticles
via Self-Assembly
type: conference
user_id: '16199'
year: '2025'
...
---
_id: '62866'
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 "
article_number: e20487
author:
- first_name: Huan
full_name: Wei, Huan
last_name: Wei
- first_name: Tong
full_name: Wu, Tong
last_name: Wu
- first_name: Chuanding
full_name: Dong, Chuanding
last_name: Dong
- first_name: Chen
full_name: Chen, Chen
last_name: Chen
- first_name: Zhenqi
full_name: Gong, Zhenqi
last_name: Gong
- first_name: Jiangnan
full_name: Xia, Jiangnan
last_name: Xia
- first_name: Chengyuan
full_name: Peng, Chengyuan
last_name: Peng
- first_name: Jiaqi
full_name: Ding, Jiaqi
last_name: Ding
- first_name: Yu
full_name: Zhang, Yu
last_name: Zhang
- first_name: Wenpei
full_name: Shi, Wenpei
last_name: Shi
- first_name: Stefan
full_name: Schumacher, Stefan
id: '27271'
last_name: Schumacher
orcid: 0000-0003-4042-4951
- first_name: Xue
full_name: Zhang, Xue
last_name: Zhang
- first_name: Yugang
full_name: Bai, Yugang
last_name: Bai
- first_name: Lang
full_name: Jiang, Lang
last_name: Jiang
- first_name: Lei
full_name: Liao, Lei
last_name: Liao
- first_name: Thuc‐Quyen
full_name: Nguyen, Thuc‐Quyen
last_name: Nguyen
- first_name: Yuanyuan
full_name: Hu, Yuanyuan
last_name: Hu
citation:
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
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
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} }'
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.
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.'
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.
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).
date_created: 2025-12-04T12:30:39Z
date_updated: 2025-12-05T13:40:48Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '705'
- _id: '35'
- _id: '230'
doi: 10.1002/advs.202520487
language:
- iso: eng
publication: Advanced Science
publication_identifier:
issn:
- 2198-3844
- 2198-3844
publication_status: published
publisher: Wiley
status: public
title: Efficient n‐Doping of Organic Semiconductors via a Broadly Applicable Nucleophilic‐Attack
Mechanism
type: journal_article
user_id: '16199'
year: '2025'
...
---
_id: '60992'
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.
author:
- first_name: Jan
full_name: Wingenbach, Jan
id: '69187'
last_name: Wingenbach
- first_name: 'Laura '
full_name: 'Ares Santos, Laura '
last_name: Ares Santos
- first_name: Xuekai
full_name: Ma, Xuekai
id: '59416'
last_name: Ma
- first_name: Jan
full_name: Sperling, Jan
id: '75127'
last_name: Sperling
orcid: 0000-0002-5844-3205
- first_name: Stefan
full_name: Schumacher, Stefan
id: '27271'
last_name: Schumacher
orcid: 0000-0003-4042-4951
citation:
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
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
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} }'
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.
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.'
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.
short: J. Wingenbach, L. Ares Santos, X. Ma, J. Sperling, S. Schumacher, Arxiv (2025).
date_created: 2025-08-25T11:15:22Z
date_updated: 2025-12-05T13:55:48Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '706'
- _id: '705'
- _id: '35'
- _id: '230'
- _id: '429'
- _id: '27'
doi: 10.48550/ARXIV.2507.07099
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: '174'
name: 'TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen
Systemen: Eine theoretische Analyse'
- _id: '56'
name: TRR 142 - Project Area C
publication: Arxiv
publisher: Arxiv
status: public
title: Sensitivity and Topology of Exceptional Rings in Nonlinear Non-Hermitian Planar
Optical Microcavities
type: journal_article
user_id: '16199'
year: '2025'
...
---
_id: '62926'
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
\ "
article_number: e17851
author:
- first_name: Atanu
full_name: Patra, Atanu
last_name: Patra
- first_name: Paul
full_name: Konrad, Paul
last_name: Konrad
- first_name: Andreas
full_name: Sperlich, Andreas
last_name: Sperlich
- first_name: Timur
full_name: Biktagirov, Timur
id: '65612'
last_name: Biktagirov
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
- first_name: Lesley
full_name: Spencer, Lesley
last_name: Spencer
- first_name: Igor
full_name: Aharonovich, Igor
last_name: Aharonovich
- first_name: Sven
full_name: Höfling, Sven
last_name: Höfling
- first_name: Vladimir
full_name: Dyakonov, Vladimir
last_name: Dyakonov
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
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
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} }'
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.
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.'
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).
date_created: 2025-12-05T14:15:35Z
date_updated: 2025-12-05T14:18:27Z
department:
- _id: '15'
- _id: '170'
- _id: '295'
- _id: '35'
- _id: '230'
- _id: '27'
doi: 10.1002/adfm.202517851
language:
- iso: eng
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: Advanced Functional Materials
publication_identifier:
issn:
- 1616-301X
- 1616-3028
publication_status: published
publisher: Wiley
status: public
title: Quantifying Spin Defect Density in hBN via Raman and Photoluminescence Analysis
type: journal_article
user_id: '16199'
year: '2025'
...
---
_id: '62980'
abstract:
- lang: eng
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.
article_number: '033062'
author:
- first_name: Denis A.
full_name: Kopylov, Denis A.
last_name: Kopylov
- first_name: Christian
full_name: Offen, Christian
id: '85279'
last_name: Offen
orcid: 0000-0002-5940-8057
- first_name: Laura
full_name: Ares, Laura
last_name: Ares
- first_name: Boris Edgar
full_name: Wembe Moafo, Boris Edgar
id: '95394'
last_name: Wembe Moafo
- first_name: Sina
full_name: Ober-Blöbaum, Sina
id: '16494'
last_name: Ober-Blöbaum
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
- first_name: Polina R.
full_name: Sharapova, Polina R.
id: '60286'
last_name: Sharapova
- first_name: Jan
full_name: Sperling, Jan
id: '75127'
last_name: Sperling
orcid: 0000-0002-5844-3205
citation:
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
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
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} }'
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.
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.'
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.
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).
date_created: 2025-12-09T09:08:39Z
date_updated: 2025-12-09T09:10:01Z
department:
- _id: '15'
- _id: '569'
- _id: '170'
- _id: '293'
- _id: '706'
- _id: '636'
- _id: '35'
- _id: '230'
- _id: '429'
- _id: '623'
doi: 10.1103/sv6z-v1gk
intvolume: ' 7'
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: '174'
name: 'TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen
Systemen: Eine theoretische Analyse'
- _id: '266'
name: 'PhoQC: Photonisches Quantencomputing'
publication: Physical Review Research
publication_identifier:
issn:
- 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Multiphoton, multimode state classification for nonlinear optical circuits
type: journal_article
user_id: '16199'
volume: 7
year: '2025'
...
---
_id: '63021'
abstract:
- lang: eng
text: Bell measurements, entailing the projection onto one of the Bell states,
play a key role in quantum information and communication, where the outcome of
a variety of protocols crucially depends on the success probability of such measurements.
Although in the case of qubit systems, Bell measurements can be implemented using
only linear optical components, the same result is no longer true for qudits,
where at least the use of ancillary photons is required. In order to circumvent
this limitation, one possibility is to introduce nonlinear effects. In this work,
we adopt the latter approach and propose a scalable Bell measurement scheme for
high-dimensional states, exploiting multiple squeezer devices applied to a linear
optical circuit for discriminating the different Bell states. Our approach does
not require ancillary photons, is not limited by the dimension of the quantum
states, and is experimentally scalable, thus paving the way toward the realization
of an effective high-dimensional Bell measurement.
article_number: '023038'
author:
- first_name: Luca
full_name: Bianchi, Luca
last_name: Bianchi
- first_name: Carlo
full_name: Marconi, Carlo
last_name: Marconi
- first_name: Jan
full_name: Sperling, Jan
id: '75127'
last_name: Sperling
orcid: 0000-0002-5844-3205
- first_name: Davide
full_name: Bacco, Davide
last_name: Bacco
citation:
ama: Bianchi L, Marconi C, Sperling J, Bacco D. Predetection squeezing as a resource
for high-dimensional Bell-state measurements. Physical Review Research.
2025;7(2). doi:10.1103/physrevresearch.7.023038
apa: Bianchi, L., Marconi, C., Sperling, J., & Bacco, D. (2025). Predetection
squeezing as a resource for high-dimensional Bell-state measurements. Physical
Review Research, 7(2), Article 023038. https://doi.org/10.1103/physrevresearch.7.023038
bibtex: '@article{Bianchi_Marconi_Sperling_Bacco_2025, title={Predetection squeezing
as a resource for high-dimensional Bell-state measurements}, volume={7}, DOI={10.1103/physrevresearch.7.023038},
number={2023038}, journal={Physical Review Research}, publisher={American Physical
Society (APS)}, author={Bianchi, Luca and Marconi, Carlo and Sperling, Jan and
Bacco, Davide}, year={2025} }'
chicago: Bianchi, Luca, Carlo Marconi, Jan Sperling, and Davide Bacco. “Predetection
Squeezing as a Resource for High-Dimensional Bell-State Measurements.” Physical
Review Research 7, no. 2 (2025). https://doi.org/10.1103/physrevresearch.7.023038.
ieee: 'L. Bianchi, C. Marconi, J. Sperling, and D. Bacco, “Predetection squeezing
as a resource for high-dimensional Bell-state measurements,” Physical Review
Research, vol. 7, no. 2, Art. no. 023038, 2025, doi: 10.1103/physrevresearch.7.023038.'
mla: Bianchi, Luca, et al. “Predetection Squeezing as a Resource for High-Dimensional
Bell-State Measurements.” Physical Review Research, vol. 7, no. 2, 023038,
American Physical Society (APS), 2025, doi:10.1103/physrevresearch.7.023038.
short: L. Bianchi, C. Marconi, J. Sperling, D. Bacco, Physical Review Research 7
(2025).
date_created: 2025-12-10T13:34:53Z
date_updated: 2025-12-10T13:36:11Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '429'
doi: 10.1103/physrevresearch.7.023038
intvolume: ' 7'
issue: '2'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
issn:
- 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Predetection squeezing as a resource for high-dimensional Bell-state measurements
type: journal_article
user_id: '75127'
volume: 7
year: '2025'
...
---
_id: '62859'
abstract:
- lang: eng
text: Frequency-filtered photon correlations have been proven to be extremely
useful in grasping how the detection process alters photon statistics. Harnessing
the spectral correlations also permits refinement of the emission and unraveling
of previously hidden strong correlations in a plethora of quantum-optical systems
under continuous-wave excitation. In this work, we investigate such correlations
for time-dependent excitation and develop a methodology to compute efficiently
time-integrated correlations, which are at the heart of the photon-counting theory,
and subsequently apply it to analyze the photon emission of pulsed systems. By
combining this formalism with the —which facilitates frequency-resolved correlations—we
demonstrate how spectral filtering enhances single-photon purity and suppresses
multiphoton noise in time-bin-encoded quantum states. Specifically, filtering
the central spectral peak of a dynamically driven two-level system boosts temporal
coherence and improves the fidelity of time-bin entanglement preparation, even
under conditions favoring multiphoton emission. These results establish spectral
filtering as a critical tool for tailoring photon statistics in pulsed quantum
light sources.
article_number: '033296'
author:
- first_name: Santiago
full_name: Bermúdez-Feijóo, Santiago
last_name: Bermúdez-Feijóo
- first_name: Eduardo
full_name: Zubizarreta Casalengua, Eduardo
last_name: Zubizarreta Casalengua
- first_name: Kai
full_name: Müller, Kai
last_name: Müller
- first_name: Klaus
full_name: Jöns, Klaus
id: '85353'
last_name: Jöns
citation:
ama: Bermúdez-Feijóo S, Zubizarreta Casalengua E, Müller K, Jöns K. Spectral correlations
of dynamical resonance fluorescence. Physical Review Research. 2025;7(3).
doi:10.1103/jmy9-bd3l
apa: Bermúdez-Feijóo, S., Zubizarreta Casalengua, E., Müller, K., & Jöns, K.
(2025). Spectral correlations of dynamical resonance fluorescence. Physical
Review Research, 7(3), Article 033296. https://doi.org/10.1103/jmy9-bd3l
bibtex: '@article{Bermúdez-Feijóo_Zubizarreta Casalengua_Müller_Jöns_2025, title={Spectral
correlations of dynamical resonance fluorescence}, volume={7}, DOI={10.1103/jmy9-bd3l},
number={3033296}, journal={Physical Review Research}, publisher={American Physical
Society (APS)}, author={Bermúdez-Feijóo, Santiago and Zubizarreta Casalengua,
Eduardo and Müller, Kai and Jöns, Klaus}, year={2025} }'
chicago: Bermúdez-Feijóo, Santiago, Eduardo Zubizarreta Casalengua, Kai Müller,
and Klaus Jöns. “Spectral Correlations of Dynamical Resonance Fluorescence.” Physical
Review Research 7, no. 3 (2025). https://doi.org/10.1103/jmy9-bd3l.
ieee: 'S. Bermúdez-Feijóo, E. Zubizarreta Casalengua, K. Müller, and K. Jöns, “Spectral
correlations of dynamical resonance fluorescence,” Physical Review Research,
vol. 7, no. 3, Art. no. 033296, 2025, doi: 10.1103/jmy9-bd3l.'
mla: Bermúdez-Feijóo, Santiago, et al. “Spectral Correlations of Dynamical Resonance
Fluorescence.” Physical Review Research, vol. 7, no. 3, 033296, American
Physical Society (APS), 2025, doi:10.1103/jmy9-bd3l.
short: S. Bermúdez-Feijóo, E. Zubizarreta Casalengua, K. Müller, K. Jöns, Physical
Review Research 7 (2025).
date_created: 2025-12-04T12:19:04Z
date_updated: 2025-12-11T12:52:24Z
department:
- _id: '623'
- _id: '15'
- _id: '429'
- _id: '642'
doi: 10.1103/jmy9-bd3l
intvolume: ' 7'
issue: '3'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
issn:
- 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Spectral correlations of dynamical resonance fluorescence
type: journal_article
user_id: '48188'
volume: 7
year: '2025'
...
---
_id: '63050'
application_number: '18957248'
author:
- first_name: Nicholas Alexander
full_name: Güsken, Nicholas Alexander
id: '112030'
last_name: Güsken
orcid: 0000-0002-4816-0666
citation:
ama: Güsken NA. Beam steering device and electronic apparatus including the same.
Published online 2025.
apa: Güsken, N. A. (2025). Beam steering device and electronic apparatus including
the same.
bibtex: '@article{Güsken_2025, title={Beam steering device and electronic apparatus
including the same}, author={Güsken, Nicholas Alexander}, year={2025} }'
chicago: Güsken, Nicholas Alexander. “Beam Steering Device and Electronic Apparatus
Including the Same,” 2025.
ieee: N. A. Güsken, “Beam steering device and electronic apparatus including the
same.” 2025.
mla: Güsken, Nicholas Alexander. Beam Steering Device and Electronic Apparatus
Including the Same. 2025.
short: N.A. Güsken, (2025).
date_created: 2025-12-11T20:43:18Z
date_updated: 2025-12-11T20:46:30Z
department:
- _id: '623'
- _id: '15'
- _id: '230'
ipc: US20250172751A1
ipn: '18957248'
publication_date: 2025/05/29
status: public
title: Beam steering device and electronic apparatus including the same
type: patent
user_id: '112030'
year: '2025'
...
---
_id: '62269'
abstract:
- lang: eng
text: The titanium in-diffused lithium niobate waveguide platform is well-established
for reliable prototyping and packaging of many quantum photonic components at
room temperature. Nevertheless, compatibility with certain quantum light sources
and superconducting detectors requires operation under cryogenic conditions. We
characterize alterations in phase-matching and mode guiding of a non-degenerate
spontaneous parametric down-conversion process emitting around 1556 nm and 950 nm,
under cryogenic conditions. Despite the effects of pyroelectricity and photorefraction,
the spectral properties match our theoretical model. Nevertheless, these effects
cause small but significant variations within and between cooling cycles. These
measurements provide a first benchmark against which other nonlinear photonic
integration platforms, such as thin-film lithium niobate, can be compared.
article_number: '50451'
article_type: original
author:
- first_name: Nina Amelie
full_name: Lange, Nina Amelie
id: '56843'
last_name: Lange
orcid: 0000-0001-6624-7098
- 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: Viktor
full_name: Quiring, Viktor
last_name: Quiring
- first_name: Werner
full_name: Ridder, Werner
id: '63574'
last_name: Ridder
- first_name: Christof
full_name: Eigner, Christof
id: '13244'
last_name: Eigner
orcid: https://orcid.org/0000-0002-5693-3083
- first_name: Harald
full_name: Herrmann, Harald
id: '216'
last_name: Herrmann
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
- first_name: Tim
full_name: Bartley, Tim
id: '49683'
last_name: Bartley
citation:
ama: Lange NA, Lengeling S, Mues P, et al. Widely non-degenerate nonlinear frequency
conversion in cryogenic titanium in-diffused lithium niobate waveguides. Optics
Express. 2025;33(24). doi:10.1364/oe.578108
apa: Lange, N. A., Lengeling, S., Mues, P., Quiring, V., Ridder, W., Eigner, C.,
Herrmann, H., Silberhorn, C., & Bartley, T. (2025). Widely non-degenerate
nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate
waveguides. Optics Express, 33(24), Article 50451. https://doi.org/10.1364/oe.578108
bibtex: '@article{Lange_Lengeling_Mues_Quiring_Ridder_Eigner_Herrmann_Silberhorn_Bartley_2025,
title={Widely non-degenerate nonlinear frequency conversion in cryogenic titanium
in-diffused lithium niobate waveguides}, volume={33}, DOI={10.1364/oe.578108},
number={2450451}, journal={Optics Express}, publisher={Optica Publishing Group},
author={Lange, Nina Amelie and Lengeling, Sebastian and Mues, Philipp and Quiring,
Viktor and Ridder, Werner and Eigner, Christof and Herrmann, Harald and Silberhorn,
Christine and Bartley, Tim}, year={2025} }'
chicago: Lange, Nina Amelie, Sebastian Lengeling, Philipp Mues, Viktor Quiring,
Werner Ridder, Christof Eigner, Harald Herrmann, Christine Silberhorn, and Tim
Bartley. “Widely Non-Degenerate Nonlinear Frequency Conversion in Cryogenic Titanium
in-Diffused Lithium Niobate Waveguides.” Optics Express 33, no. 24 (2025).
https://doi.org/10.1364/oe.578108.
ieee: 'N. A. Lange et al., “Widely non-degenerate nonlinear frequency conversion
in cryogenic titanium in-diffused lithium niobate waveguides,” Optics Express,
vol. 33, no. 24, Art. no. 50451, 2025, doi: 10.1364/oe.578108.'
mla: Lange, Nina Amelie, et al. “Widely Non-Degenerate Nonlinear Frequency Conversion
in Cryogenic Titanium in-Diffused Lithium Niobate Waveguides.” Optics Express,
vol. 33, no. 24, 50451, Optica Publishing Group, 2025, doi:10.1364/oe.578108.
short: N.A. Lange, S. Lengeling, P. Mues, V. Quiring, W. Ridder, C. Eigner, H. Herrmann,
C. Silberhorn, T. Bartley, Optics Express 33 (2025).
date_created: 2025-11-20T10:35:35Z
date_updated: 2025-12-12T12:13:45Z
department:
- _id: '15'
- _id: '623'
- _id: '288'
doi: 10.1364/oe.578108
intvolume: ' 33'
issue: '24'
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
project:
- _id: '171'
name: 'TRR 142; TP C07: Hohlraum-verstärkte Parametrische Fluoreszenz mit zeitlicher
Filterung unter Verwendung integrierter supraleitender Detektoren'
publication: Optics Express
publication_identifier:
issn:
- 1094-4087
publication_status: published
publisher: Optica Publishing Group
status: public
title: Widely non-degenerate nonlinear frequency conversion in cryogenic titanium
in-diffused lithium niobate waveguides
type: journal_article
user_id: '49683'
volume: 33
year: '2025'
...
---
_id: '63072'
abstract:
- lang: eng
text: Titanium alloys are widely employed for biomedical implants due to
their high strength, biocompatibility, and corrosion resistance, yet their lack
of intrinsic antibacterial activity remains a major limitation. Incorporating
copper, an antibacterial and β-stabilising element, offers a promising strategy
to enhance implant performance. This study investigates Ti-6Al-7Nb modified with
1–9 wt.% Cu via in situ alloying during metal-based laser powder bed fusion (PBF-LB/M),
with the aim of assessing processability, microstructural evolution, and mechanical
properties. Highly dense samples (>99.9%) were produced across all Cu levels,
though chemical homogeneity strongly depended on processing parameters. Increasing
Cu content promoted β-phase stabilisation, Ti2Cu precipitation, and pronounced
grain refinement. Hardness and yield strength increased nearly linearly with Cu
addition, while ductility decreased sharply at ≥5 wt.% Cu due to intermetallic
formation, hot cracking, and brittle fracture. These results illustrate both the
opportunities and constraints of rapid alloy screening via PBF-LB/M. Overall,
moderate Cu additions of 1–3 wt.% provide the most favourable balance between
mechanical performance, manufacturability, and potential antibacterial functionality.
These findings provide a clear guideline for the design of Cu-functionalised titanium
implants and demonstrate the efficiency of in situ alloy screening for accelerated
materials development.
article_number: '1053'
article_type: original
author:
- first_name: Paul
full_name: Steinmeier, Paul
last_name: Steinmeier
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
last_name: Hoyer
- first_name: Nelson Filipe
full_name: Lopes Dias, Nelson Filipe
last_name: Lopes Dias
- first_name: Reiner
full_name: Zielke, Reiner
last_name: Zielke
- first_name: Wolfgang
full_name: Tillmann, Wolfgang
last_name: Tillmann
- first_name: Mirko
full_name: Schaper, Mirko
last_name: Schaper
citation:
ama: Steinmeier P, Hoyer K-P, Lopes Dias NF, Zielke R, Tillmann W, Schaper M. In
Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion. Crystals.
2025;15(12). doi:10.3390/cryst15121053
apa: Steinmeier, P., Hoyer, K.-P., Lopes Dias, N. F., Zielke, R., Tillmann, W.,
& Schaper, M. (2025). In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser
Powder Bed Fusion. Crystals, 15(12), Article 1053. https://doi.org/10.3390/cryst15121053
bibtex: '@article{Steinmeier_Hoyer_Lopes Dias_Zielke_Tillmann_Schaper_2025, title={In
Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion}, volume={15},
DOI={10.3390/cryst15121053},
number={121053}, journal={Crystals}, publisher={MDPI AG}, author={Steinmeier,
Paul and Hoyer, Kay-Peter and Lopes Dias, Nelson Filipe and Zielke, Reiner and
Tillmann, Wolfgang and Schaper, Mirko}, year={2025} }'
chicago: Steinmeier, Paul, Kay-Peter Hoyer, Nelson Filipe Lopes Dias, Reiner Zielke,
Wolfgang Tillmann, and Mirko Schaper. “In Situ Alloying of Ti-6Al-7Nb with Copper
Using Laser Powder Bed Fusion.” Crystals 15, no. 12 (2025). https://doi.org/10.3390/cryst15121053.
ieee: 'P. Steinmeier, K.-P. Hoyer, N. F. Lopes Dias, R. Zielke, W. Tillmann, and
M. Schaper, “In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed
Fusion,” Crystals, vol. 15, no. 12, Art. no. 1053, 2025, doi: 10.3390/cryst15121053.'
mla: Steinmeier, Paul, et al. “In Situ Alloying of Ti-6Al-7Nb with Copper Using
Laser Powder Bed Fusion.” Crystals, vol. 15, no. 12, 1053, MDPI AG, 2025,
doi:10.3390/cryst15121053.
short: P. Steinmeier, K.-P. Hoyer, N.F. Lopes Dias, R. Zielke, W. Tillmann, M. Schaper,
Crystals 15 (2025).
date_created: 2025-12-12T13:11:59Z
date_updated: 2025-12-12T14:02:13Z
ddc:
- '620'
department:
- _id: '158'
- _id: '321'
doi: 10.3390/cryst15121053
file:
- access_level: closed
content_type: application/pdf
creator: paulstei
date_created: 2025-12-12T13:12:33Z
date_updated: 2025-12-12T13:12:33Z
file_id: '63073'
file_name: crystals-15-01053.pdf
file_size: 20716652
relation: main_file
success: 1
file_date_updated: 2025-12-12T13:12:33Z
funded_apc: '1'
has_accepted_license: '1'
intvolume: ' 15'
issue: '12'
keyword:
- Biomaterial
- In Situ Alloying
- Titanium
- Additive Manufacturing
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3390/cryst15121053
oa: '1'
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion
type: journal_article
user_id: '69776'
volume: 15
year: '2025'
...
---
_id: '62921'
author:
- first_name: Marvin Lee
full_name: Fox, Marvin Lee
id: '80773'
last_name: Fox
- first_name: Hendrik
full_name: Peeters, Hendrik
id: '49942'
last_name: Peeters
orcid: https://orcid.org/ 0000-0002-7143-3781
- first_name: Sabine
full_name: Fechner, Sabine
id: '54823'
last_name: Fechner
orcid: 0000-0001-5645-5870
citation:
ama: 'Fox ML, Peeters H, Fechner S. How can students be supported by ChatGPT as
a tutor in hands-on chemistry education? In: Conference of The European Science
Education Research Association (ESERA). ; 2025.'
apa: Fox, M. L., Peeters, H., & Fechner, S. (2025). How can students be supported
by ChatGPT as a tutor in hands-on chemistry education? Conference of The European
Science Education Research Association (ESERA). ESERA conference, Copenhagen,
Denmark.
bibtex: '@inproceedings{Fox_Peeters_Fechner_2025, title={How can students be supported
by ChatGPT as a tutor in hands-on chemistry education?}, booktitle={Conference
of The European Science Education Research Association (ESERA)}, author={Fox,
Marvin Lee and Peeters, Hendrik and Fechner, Sabine}, year={2025} }'
chicago: Fox, Marvin Lee, Hendrik Peeters, and Sabine Fechner. “How Can Students
Be Supported by ChatGPT as a Tutor in Hands-on Chemistry Education?” In Conference
of The European Science Education Research Association (ESERA), 2025.
ieee: M. L. Fox, H. Peeters, and S. Fechner, “How can students be supported by ChatGPT
as a tutor in hands-on chemistry education?,” presented at the ESERA conference,
Copenhagen, Denmark, 2025.
mla: Fox, Marvin Lee, et al. “How Can Students Be Supported by ChatGPT as a Tutor
in Hands-on Chemistry Education?” Conference of The European Science Education
Research Association (ESERA), 2025.
short: 'M.L. Fox, H. Peeters, S. Fechner, in: Conference of The European Science
Education Research Association (ESERA), 2025.'
conference:
end_date: 2025-09-29
location: Copenhagen, Denmark
name: ESERA conference
start_date: 2025-09-25
date_created: 2025-12-05T12:57:51Z
date_updated: 2025-12-13T23:54:59Z
department:
- _id: '386'
- _id: '33'
keyword:
- Artificial intelligence
- education
- chemistry
language:
- iso: eng
publication: Conference of The European Science Education Research Association (ESERA)
quality_controlled: '1'
status: public
title: How can students be supported by ChatGPT as a tutor in hands-on chemistry education?
type: conference_abstract
user_id: '54823'
year: '2025'
...