---
_id: '64877'
author:
- first_name: Behnood
full_name: Taheri, Behnood
last_name: Taheri
- first_name: Denis
full_name: Kopylov, Denis
id: '98502'
last_name: Kopylov
- first_name: Manfred
full_name: Hammer, Manfred
id: '48077'
last_name: Hammer
orcid: 0000-0002-6331-9348
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
- first_name: Jens
full_name: Förstner, Jens
id: '158'
last_name: Förstner
orcid: 0000-0001-7059-9862
- first_name: Polina R.
full_name: Sharapova, Polina R.
id: '60286'
last_name: Sharapova
citation:
ama: Taheri B, Kopylov D, Hammer M, Meier T, Förstner J, Sharapova PR. Gain-induced
spectral non-degeneracy in type-II parametric down-conversion. arXiv. Published
online 2026. doi:10.48550/ARXIV.2603.01656
apa: Taheri, B., Kopylov, D., Hammer, M., Meier, T., Förstner, J., & Sharapova,
P. R. (2026). Gain-induced spectral non-degeneracy in type-II parametric down-conversion.
ArXiv. https://doi.org/10.48550/ARXIV.2603.01656
bibtex: '@article{Taheri_Kopylov_Hammer_Meier_Förstner_Sharapova_2026, title={Gain-induced
spectral non-degeneracy in type-II parametric down-conversion}, DOI={10.48550/ARXIV.2603.01656},
journal={arXiv}, author={Taheri, Behnood and Kopylov, Denis and Hammer, Manfred
and Meier, Torsten and Förstner, Jens and Sharapova, Polina R.}, year={2026} }'
chicago: Taheri, Behnood, Denis Kopylov, Manfred Hammer, Torsten Meier, Jens Förstner,
and Polina R. Sharapova. “Gain-Induced Spectral Non-Degeneracy in Type-II Parametric
down-Conversion.” ArXiv, 2026. https://doi.org/10.48550/ARXIV.2603.01656.
ieee: 'B. Taheri, D. Kopylov, M. Hammer, T. Meier, J. Förstner, and P. R. Sharapova,
“Gain-induced spectral non-degeneracy in type-II parametric down-conversion,”
arXiv, 2026, doi: 10.48550/ARXIV.2603.01656.'
mla: Taheri, Behnood, et al. “Gain-Induced Spectral Non-Degeneracy in Type-II Parametric
down-Conversion.” ArXiv, 2026, doi:10.48550/ARXIV.2603.01656.
short: B. Taheri, D. Kopylov, M. Hammer, T. Meier, J. Förstner, P.R. Sharapova,
ArXiv (2026).
date_created: 2026-03-10T15:37:22Z
date_updated: 2026-03-10T15:41:18Z
department:
- _id: '15'
- _id: '569'
- _id: '170'
- _id: '293'
- _id: '35'
- _id: '34'
- _id: '61'
- _id: '230'
- _id: '623'
- _id: '429'
doi: 10.48550/ARXIV.2603.01656
language:
- iso: eng
project:
- _id: '168'
name: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat
(B07*)
- _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: arXiv
status: public
title: Gain-induced spectral non-degeneracy in type-II parametric down-conversion
type: journal_article
user_id: '16199'
year: '2026'
...
---
_id: '63744'
abstract:
- lang: eng
text: Orbital angular momentum (OAM) modes are an important resource used in various
branches of quantum science and technology due to their unique helical structure
and countably infinite basis. Generating light that simultaneously carries high-order
orbital angular momenta and exhibits quantum correlations is a challenging task.
In this work, we present a theoretical approach to the generation of correlated
Schmidt modes carrying OAM via parametric down-conversion (PDC) in cascaded nonlinear
systems (nonlinear interferometers) pumped by Laguerre–Gaussian beams. We demonstrate
how the number of generated modes and their population can be controlled by varying
the pump parameters, the gain of the PDC process, and the distance between the
crystals. We investigate the angular displacement measurement uncertainty of these
interferometers and demonstrate that it can overcome the classical shot noise
limit.
article_number: '016112'
article_type: original
author:
- first_name: Dennis
full_name: Scharwald, Dennis
id: '55907'
last_name: Scharwald
orcid: 0009-0007-5654-5412
- first_name: Lucas
full_name: Gehse, Lucas
last_name: Gehse
- first_name: Polina
full_name: Sharapova, Polina
id: '60286'
last_name: Sharapova
citation:
ama: Scharwald D, Gehse L, Sharapova P. Schmidt modes carrying orbital angular momentum
generated by cascaded systems pumped with Laguerre–Gaussian beams. APL Photonics.
2025;10(1). doi:10.1063/5.0229802
apa: Scharwald, D., Gehse, L., & Sharapova, P. (2025). Schmidt modes carrying
orbital angular momentum generated by cascaded systems pumped with Laguerre–Gaussian
beams. APL Photonics, 10(1), Article 016112. https://doi.org/10.1063/5.0229802
bibtex: '@article{Scharwald_Gehse_Sharapova_2025, title={Schmidt modes carrying
orbital angular momentum generated by cascaded systems pumped with Laguerre–Gaussian
beams}, volume={10}, DOI={10.1063/5.0229802},
number={1016112}, journal={APL Photonics}, publisher={AIP Publishing}, author={Scharwald,
Dennis and Gehse, Lucas and Sharapova, Polina}, year={2025} }'
chicago: Scharwald, Dennis, Lucas Gehse, and Polina Sharapova. “Schmidt Modes Carrying
Orbital Angular Momentum Generated by Cascaded Systems Pumped with Laguerre–Gaussian
Beams.” APL Photonics 10, no. 1 (2025). https://doi.org/10.1063/5.0229802.
ieee: 'D. Scharwald, L. Gehse, and P. Sharapova, “Schmidt modes carrying orbital
angular momentum generated by cascaded systems pumped with Laguerre–Gaussian beams,”
APL Photonics, vol. 10, no. 1, Art. no. 016112, 2025, doi: 10.1063/5.0229802.'
mla: Scharwald, Dennis, et al. “Schmidt Modes Carrying Orbital Angular Momentum
Generated by Cascaded Systems Pumped with Laguerre–Gaussian Beams.” APL Photonics,
vol. 10, no. 1, 016112, AIP Publishing, 2025, doi:10.1063/5.0229802.
short: D. Scharwald, L. Gehse, P. Sharapova, APL Photonics 10 (2025).
date_created: 2026-01-26T15:48:54Z
date_updated: 2026-02-01T13:19:20Z
department:
- _id: '15'
- _id: '569'
- _id: '170'
- _id: '35'
- _id: '429'
doi: 10.1063/5.0229802
intvolume: ' 10'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://pubs.aip.org/aip/app/article-pdf/doi/10.1063/5.0229802/20352749/016112_1_5.0229802.pdf
oa: '1'
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: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: APL Photonics
publication_identifier:
issn:
- 2378-0967
publication_status: published
publisher: AIP Publishing
status: public
title: Schmidt modes carrying orbital angular momentum generated by cascaded systems
pumped with Laguerre–Gaussian beams
type: journal_article
user_id: '55907'
volume: 10
year: '2025'
...
---
_id: '63745'
abstract:
- lang: eng
text: Multimode squeezed light is an increasingly popular tool in photonic quantum
technologies, including sensing, imaging, and computation. Meanwhile, the existing
methods of its characterization are technically complicated, which reduces the
level of squeezing, and mostly deal with a single mode at a time. Here, for the
first time, to the best of our knowledge, we employ optical parametric amplification
to characterize multiple squeezing eigenmodes simultaneously. We retrieve the
shapes and squeezing degrees of all modes at once through direct detection followed
by modal decomposition. This method is tolerant to inefficient detection and does
not require a local oscillator. For a spectrally and spatially multimode squeezed
vacuum, we characterize eight strongest spatial modes, obtaining squeezing and
anti-squeezing values of up to −5.2 ± 0.2 dB and 8.6 ± 0.3 dB, respectively, despite
the 50% detection loss. This work, being the first exploration of an optical parametric
amplifier’s multimode capability for squeezing detection, paves the way for the
real-time detection of multimode squeezing.
article_number: '36'
article_type: original
author:
- first_name: Ismail
full_name: Barakat, Ismail
last_name: Barakat
- first_name: Mahmoud
full_name: Kalash, Mahmoud
last_name: Kalash
- first_name: Dennis
full_name: Scharwald, Dennis
id: '55907'
last_name: Scharwald
orcid: 0009-0007-5654-5412
- first_name: Polina
full_name: Sharapova, Polina
id: '60286'
last_name: Sharapova
- first_name: Norbert
full_name: Lindlein, Norbert
last_name: Lindlein
- first_name: Maria
full_name: Chekhova, Maria
last_name: Chekhova
citation:
ama: Barakat I, Kalash M, Scharwald D, Sharapova P, Lindlein N, Chekhova M. Simultaneous
measurement of multimode squeezing through multimode phase-sensitive amplification.
Optica Quantum. 2025;3(1). doi:10.1364/opticaq.524682
apa: Barakat, I., Kalash, M., Scharwald, D., Sharapova, P., Lindlein, N., &
Chekhova, M. (2025). Simultaneous measurement of multimode squeezing through multimode
phase-sensitive amplification. Optica Quantum, 3(1), Article 36.
https://doi.org/10.1364/opticaq.524682
bibtex: '@article{Barakat_Kalash_Scharwald_Sharapova_Lindlein_Chekhova_2025, title={Simultaneous
measurement of multimode squeezing through multimode phase-sensitive amplification},
volume={3}, DOI={10.1364/opticaq.524682},
number={136}, journal={Optica Quantum}, publisher={Optica Publishing Group}, author={Barakat,
Ismail and Kalash, Mahmoud and Scharwald, Dennis and Sharapova, Polina and Lindlein,
Norbert and Chekhova, Maria}, year={2025} }'
chicago: Barakat, Ismail, Mahmoud Kalash, Dennis Scharwald, Polina Sharapova, Norbert
Lindlein, and Maria Chekhova. “Simultaneous Measurement of Multimode Squeezing
through Multimode Phase-Sensitive Amplification.” Optica Quantum 3, no.
1 (2025). https://doi.org/10.1364/opticaq.524682.
ieee: 'I. Barakat, M. Kalash, D. Scharwald, P. Sharapova, N. Lindlein, and M. Chekhova,
“Simultaneous measurement of multimode squeezing through multimode phase-sensitive
amplification,” Optica Quantum, vol. 3, no. 1, Art. no. 36, 2025, doi:
10.1364/opticaq.524682.'
mla: Barakat, Ismail, et al. “Simultaneous Measurement of Multimode Squeezing through
Multimode Phase-Sensitive Amplification.” Optica Quantum, vol. 3, no. 1,
36, Optica Publishing Group, 2025, doi:10.1364/opticaq.524682.
short: I. Barakat, M. Kalash, D. Scharwald, P. Sharapova, N. Lindlein, M. Chekhova,
Optica Quantum 3 (2025).
date_created: 2026-01-26T15:57:13Z
date_updated: 2026-02-10T22:44:44Z
department:
- _id: '15'
- _id: '569'
- _id: '170'
- _id: '35'
- _id: '429'
doi: 10.1364/opticaq.524682
intvolume: ' 3'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://opg.optica.org/opticaq/viewmedia.cfm?uri=opticaq-3-1-36&seq=0
oa: '1'
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: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: Optica Quantum
publication_identifier:
issn:
- 2837-6714
publication_status: published
publisher: Optica Publishing Group
status: public
title: Simultaneous measurement of multimode squeezing through multimode phase-sensitive
amplification
type: journal_article
user_id: '55907'
volume: 3
year: '2025'
...
---
_id: '60565'
article_number: '104103'
author:
- first_name: Adriana
full_name: Bocchini, Adriana
id: '58349'
last_name: Bocchini
orcid: 0000-0002-2134-3075
- first_name: Uwe
full_name: Gerstmann, Uwe
id: '171'
last_name: Gerstmann
orcid: 0000-0002-4476-223X
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
citation:
ama: Bocchini A, Gerstmann U, Schmidt WG. Microscopic origin of gray tracks in <mml:math
xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>KTiOPO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>.
Physical Review B. 2025;111(10). doi:10.1103/physrevb.111.104103
apa: Bocchini, A., Gerstmann, U., & Schmidt, W. G. (2025). Microscopic origin
of gray tracks in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>KTiOPO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>.
Physical Review B, 111(10), Article 104103. https://doi.org/10.1103/physrevb.111.104103
bibtex: '@article{Bocchini_Gerstmann_Schmidt_2025, title={Microscopic origin of
gray tracks in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>KTiOPO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>},
volume={111}, DOI={10.1103/physrevb.111.104103},
number={10104103}, journal={Physical Review B}, publisher={American Physical Society
(APS)}, author={Bocchini, Adriana and Gerstmann, Uwe and Schmidt, Wolf Gero},
year={2025} }'
chicago: Bocchini, Adriana, Uwe Gerstmann, and Wolf Gero Schmidt. “Microscopic Origin
of Gray Tracks in <mml:Math Xmlns:Mml="http://Www.W3.Org/1998/Math/MathML"><mml:Msub><mml:Mi>KTiOPO</Mml:Mi><mml:Mn>4</Mml:Mn></Mml:Msub></Mml:Math>.”
Physical Review B 111, no. 10 (2025). https://doi.org/10.1103/physrevb.111.104103.
ieee: 'A. Bocchini, U. Gerstmann, and W. G. Schmidt, “Microscopic origin of gray
tracks in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>KTiOPO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>,”
Physical Review B, vol. 111, no. 10, Art. no. 104103, 2025, doi: 10.1103/physrevb.111.104103.'
mla: Bocchini, Adriana, et al. “Microscopic Origin of Gray Tracks in <mml:Math
Xmlns:Mml="http://Www.W3.Org/1998/Math/MathML"><mml:Msub><mml:Mi>KTiOPO</Mml:Mi><mml:Mn>4</Mml:Mn></Mml:Msub></Mml:Math>.”
Physical Review B, vol. 111, no. 10, 104103, American Physical Society
(APS), 2025, doi:10.1103/physrevb.111.104103.
short: A. Bocchini, U. Gerstmann, W.G. Schmidt, Physical Review B 111 (2025).
date_created: 2025-07-09T08:58:32Z
date_updated: 2025-07-09T09:30:31Z
department:
- _id: '15'
- _id: '295'
- _id: '790'
- _id: '230'
- _id: '429'
- _id: '35'
- _id: '170'
- _id: '27'
doi: 10.1103/physrevb.111.104103
intvolume: ' 111'
issue: '10'
language:
- iso: eng
project:
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
- _id: '53'
grant_number: '231447078'
name: 'TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden
Konzepten zu funktionellen Strukturen'
- _id: '54'
name: 'TRR 142 - A: TRR 142 - Project Area A'
- _id: '55'
name: 'TRR 142 - B: TRR 142 - Project Area B'
- _id: '168'
grant_number: '231447078'
name: 'TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften
von Lithiumniobat (B07*)'
- _id: '166'
name: 'TRR 142 - A11: TRR 142 - Subproject A11'
publication: Physical Review B
publication_identifier:
issn:
- 2469-9950
- 2469-9969
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Microscopic origin of gray tracks in KTiOPO4
type: journal_article
user_id: '16199'
volume: 111
year: '2025'
...
---
_id: '60580'
abstract:
- lang: eng
text: AbstractAlInP (001) is widely utilized as
a window layer in optoelectronic devices, including world‐record III‐V multi‐junction
solar cells and photoelectrochemical (PEC) cells. The chemical and electronic
properties of AlInP (001) depend on its surface reconstruction, which impacts
its interaction with electrolytes in PEC applications and passivation layers.
This study investigates AlInP (001) surface reconstructions using density functional
theory and experimental methods. Phosphorus‐rich (P‐rich) and indium‐rich (In‐rich)
AlInP surfaces are prepared with in situ monitoring of the process by reflection
anisotropy (RA) spectroscopy and confirmed by low‐energy electron diffraction
and photoemission spectroscopy. The experimental RA spectra closely match the
theoretical predictions obtained by solving the Bethe–Salpeter equation. It is
shown that missing hydrogen on P‐rich surfaces and formation of In–In 1D atomic
chains on In‐rich surfaces introduce mid‐gap surface states that pin the Fermi
level and induce band bending. Time‐resolved two‐photon photoemission measurements
reveal ultrafast near‐surface electron dynamics for both P‐rich and In‐rich surfaces,
demonstrating photoexcited electrons reaching the surface conduction band minimum
and relaxing to mid‐gap surface states on about hundreds of fs. This work provides
the most extensive AlInP surface analysis to date, allowing for more targeted
surface and interface engineering, which is crucial for the optimization and design
of III‐V heterostructures.
author:
- first_name: Mohammad Amin
full_name: Zare Pour, Mohammad Amin
last_name: Zare Pour
- first_name: Sahar
full_name: Shekarabi, Sahar
last_name: Shekarabi
- first_name: Isaac Azahel
full_name: Ruiz Alvarado, Isaac Azahel
id: '79462'
last_name: Ruiz Alvarado
orcid: 0000-0002-4710-1170
- first_name: Jonathan
full_name: Diederich, Jonathan
last_name: Diederich
- first_name: Yuyings
full_name: Gao, Yuyings
last_name: Gao
- first_name: Agnieszka
full_name: Paszuk, Agnieszka
last_name: Paszuk
- first_name: Dominik C.
full_name: Moritz, Dominik C.
last_name: Moritz
- first_name: Wolfram
full_name: Jaegermann, Wolfram
last_name: Jaegermann
- first_name: Dennis
full_name: Friedrich, Dennis
last_name: Friedrich
- first_name: Roel
full_name: van de Krol, Roel
last_name: van de Krol
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
- first_name: Thomas
full_name: Hannappel, Thomas
last_name: Hannappel
citation:
ama: 'Zare Pour MA, Shekarabi S, Ruiz Alvarado IA, et al. Exploring Electronic States
and Ultrafast Electron Dynamics in AlInP Window Layers: The Role of Surface Reconstruction.
Advanced Functional Materials. Published online 2025. doi:10.1002/adfm.202423702'
apa: 'Zare Pour, M. A., Shekarabi, S., Ruiz Alvarado, I. A., Diederich, J., Gao,
Y., Paszuk, A., Moritz, D. C., Jaegermann, W., Friedrich, D., van de Krol, R.,
Schmidt, W. G., & Hannappel, T. (2025). Exploring Electronic States and Ultrafast
Electron Dynamics in AlInP Window Layers: The Role of Surface Reconstruction.
Advanced Functional Materials. https://doi.org/10.1002/adfm.202423702'
bibtex: '@article{Zare Pour_Shekarabi_Ruiz Alvarado_Diederich_Gao_Paszuk_Moritz_Jaegermann_Friedrich_van
de Krol_et al._2025, title={Exploring Electronic States and Ultrafast Electron
Dynamics in AlInP Window Layers: The Role of Surface Reconstruction}, DOI={10.1002/adfm.202423702}, journal={Advanced
Functional Materials}, publisher={Wiley}, author={Zare Pour, Mohammad Amin and
Shekarabi, Sahar and Ruiz Alvarado, Isaac Azahel and Diederich, Jonathan and Gao,
Yuyings and Paszuk, Agnieszka and Moritz, Dominik C. and Jaegermann, Wolfram and
Friedrich, Dennis and van de Krol, Roel and et al.}, year={2025} }'
chicago: 'Zare Pour, Mohammad Amin, Sahar Shekarabi, Isaac Azahel Ruiz Alvarado,
Jonathan Diederich, Yuyings Gao, Agnieszka Paszuk, Dominik C. Moritz, et al. “Exploring
Electronic States and Ultrafast Electron Dynamics in AlInP Window Layers: The
Role of Surface Reconstruction.” Advanced Functional Materials, 2025. https://doi.org/10.1002/adfm.202423702.'
ieee: 'M. A. Zare Pour et al., “Exploring Electronic States and Ultrafast
Electron Dynamics in AlInP Window Layers: The Role of Surface Reconstruction,”
Advanced Functional Materials, 2025, doi: 10.1002/adfm.202423702.'
mla: 'Zare Pour, Mohammad Amin, et al. “Exploring Electronic States and Ultrafast
Electron Dynamics in AlInP Window Layers: The Role of Surface Reconstruction.”
Advanced Functional Materials, Wiley, 2025, doi:10.1002/adfm.202423702.'
short: M.A. Zare Pour, S. Shekarabi, I.A. Ruiz Alvarado, J. Diederich, Y. Gao, A.
Paszuk, D.C. Moritz, W. Jaegermann, D. Friedrich, R. van de Krol, W.G. Schmidt,
T. Hannappel, Advanced Functional Materials (2025).
date_created: 2025-07-09T13:33:15Z
date_updated: 2025-07-09T13:54:05Z
department:
- _id: '15'
- _id: '170'
- _id: '230'
- _id: '27'
- _id: '295'
doi: 10.1002/adfm.202423702
language:
- iso: eng
publication: Advanced Functional Materials
publication_identifier:
issn:
- 1616-301X
- 1616-3028
publication_status: published
publisher: Wiley
status: public
title: 'Exploring Electronic States and Ultrafast Electron Dynamics in AlInP Window
Layers: The Role of Surface Reconstruction'
type: journal_article
user_id: '79462'
year: '2025'
...
---
_id: '58642'
abstract:
- lang: eng
text: We present a cost-effective self-assembly method to fabricate low-density
dimer NPs in an NPoM architecture, using the M13 phage as a spacer layer. This
will enable the development of dynamic plasmonic devices and advanced sensing
applications.
article_type: original
author:
- first_name: Vasanthan
full_name: Devaraj, Vasanthan
id: '103814'
last_name: Devaraj
- first_name: Isaac Azahel
full_name: Ruiz Alvarado, Isaac Azahel
id: '79462'
last_name: Ruiz Alvarado
orcid: 0000-0002-4710-1170
- first_name: Jong-Min
full_name: Lee, Jong-Min
last_name: Lee
- first_name: Jin-Woo
full_name: Oh, Jin-Woo
last_name: Oh
- first_name: Uwe
full_name: Gerstmann, Uwe
id: '171'
last_name: Gerstmann
orcid: 0000-0002-4476-223X
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
- first_name: Thomas
full_name: Zentgraf, Thomas
id: '30525'
last_name: Zentgraf
orcid: 0000-0002-8662-1101
citation:
ama: Devaraj V, Ruiz Alvarado IA, Lee J-M, et al. Self-assembly of isolated plasmonic
dimers with sub-5 nm gaps on a metallic mirror. Nanoscale Horizons. 2025;10:537-548.
doi:10.1039/d4nh00546e
apa: Devaraj, V., Ruiz Alvarado, I. A., Lee, J.-M., Oh, J.-W., Gerstmann, U., Schmidt,
W. G., & Zentgraf, T. (2025). Self-assembly of isolated plasmonic dimers with
sub-5 nm gaps on a metallic mirror. Nanoscale Horizons, 10, 537–548.
https://doi.org/10.1039/d4nh00546e
bibtex: '@article{Devaraj_Ruiz Alvarado_Lee_Oh_Gerstmann_Schmidt_Zentgraf_2025,
title={Self-assembly of isolated plasmonic dimers with sub-5 nm gaps on a metallic
mirror}, volume={10}, DOI={10.1039/d4nh00546e},
journal={Nanoscale Horizons}, publisher={Royal Society of Chemistry (RSC)}, author={Devaraj,
Vasanthan and Ruiz Alvarado, Isaac Azahel and Lee, Jong-Min and Oh, Jin-Woo and
Gerstmann, Uwe and Schmidt, Wolf Gero and Zentgraf, Thomas}, year={2025}, pages={537–548}
}'
chicago: 'Devaraj, Vasanthan, Isaac Azahel Ruiz Alvarado, Jong-Min Lee, Jin-Woo
Oh, Uwe Gerstmann, Wolf Gero Schmidt, and Thomas Zentgraf. “Self-Assembly of Isolated
Plasmonic Dimers with Sub-5 Nm Gaps on a Metallic Mirror.” Nanoscale Horizons
10 (2025): 537–48. https://doi.org/10.1039/d4nh00546e.'
ieee: 'V. Devaraj et al., “Self-assembly of isolated plasmonic dimers with
sub-5 nm gaps on a metallic mirror,” Nanoscale Horizons, vol. 10, pp. 537–548,
2025, doi: 10.1039/d4nh00546e.'
mla: Devaraj, Vasanthan, et al. “Self-Assembly of Isolated Plasmonic Dimers with
Sub-5 Nm Gaps on a Metallic Mirror.” Nanoscale Horizons, vol. 10, Royal
Society of Chemistry (RSC), 2025, pp. 537–48, doi:10.1039/d4nh00546e.
short: V. Devaraj, I.A. Ruiz Alvarado, J.-M. Lee, J.-W. Oh, U. Gerstmann, W.G. Schmidt,
T. Zentgraf, Nanoscale Horizons 10 (2025) 537–548.
date_created: 2025-02-14T08:13:10Z
date_updated: 2025-07-09T14:04:39Z
department:
- _id: '15'
- _id: '230'
- _id: '289'
- _id: '623'
- _id: '35'
- _id: '295'
- _id: '170'
- _id: '429'
- _id: '27'
doi: 10.1039/d4nh00546e
intvolume: ' 10'
language:
- iso: eng
page: 537-548
project:
- _id: '53'
grant_number: '231447078'
name: 'TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden
Konzepten zu funktionellen Strukturen'
- _id: '168'
grant_number: '231447078'
name: 'TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften
von Lithiumniobat (B07*)'
- _id: '55'
name: 'TRR 142 - B: TRR 142 - Project Area B'
- _id: '445'
grant_number: '367360193'
name: Hochleistungsrechner Noctua in Paderborn
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: Nanoscale Horizons
publication_identifier:
issn:
- 2055-6756
- 2055-6764
publication_status: published
publisher: Royal Society of Chemistry (RSC)
quality_controlled: '1'
status: public
title: Self-assembly of isolated plasmonic dimers with sub-5 nm gaps on a metallic
mirror
type: journal_article
user_id: '16199'
volume: 10
year: '2025'
...
---
_id: '61245'
article_number: '032404'
author:
- first_name: Franziska
full_name: Barkhausen, Franziska
id: '63631'
last_name: Barkhausen
- first_name: Laura
full_name: Ares Santos, Laura
last_name: Ares Santos
- first_name: Stefan
full_name: Schumacher, Stefan
id: '27271'
last_name: Schumacher
orcid: 0000-0003-4042-4951
- first_name: Jan
full_name: Sperling, Jan
id: '75127'
last_name: Sperling
orcid: 0000-0002-5844-3205
citation:
ama: 'Barkhausen F, Ares Santos L, Schumacher S, Sperling J. Entanglement between
dependent degrees of freedom: Quasiparticle correlations. Physical Review A.
2025;111(3). doi:10.1103/physreva.111.032404'
apa: 'Barkhausen, F., Ares Santos, L., Schumacher, S., & Sperling, J. (2025).
Entanglement between dependent degrees of freedom: Quasiparticle correlations.
Physical Review A, 111(3), Article 032404. https://doi.org/10.1103/physreva.111.032404'
bibtex: '@article{Barkhausen_Ares Santos_Schumacher_Sperling_2025, title={Entanglement
between dependent degrees of freedom: Quasiparticle correlations}, volume={111},
DOI={10.1103/physreva.111.032404},
number={3032404}, journal={Physical Review A}, publisher={American Physical Society
(APS)}, author={Barkhausen, Franziska and Ares Santos, Laura and Schumacher, Stefan
and Sperling, Jan}, year={2025} }'
chicago: 'Barkhausen, Franziska, Laura Ares Santos, Stefan Schumacher, and Jan Sperling.
“Entanglement between Dependent Degrees of Freedom: Quasiparticle Correlations.”
Physical Review A 111, no. 3 (2025). https://doi.org/10.1103/physreva.111.032404.'
ieee: 'F. Barkhausen, L. Ares Santos, S. Schumacher, and J. Sperling, “Entanglement
between dependent degrees of freedom: Quasiparticle correlations,” Physical
Review A, vol. 111, no. 3, Art. no. 032404, 2025, doi: 10.1103/physreva.111.032404.'
mla: 'Barkhausen, Franziska, et al. “Entanglement between Dependent Degrees of Freedom:
Quasiparticle Correlations.” Physical Review A, vol. 111, no. 3, 032404,
American Physical Society (APS), 2025, doi:10.1103/physreva.111.032404.'
short: F. Barkhausen, L. Ares Santos, S. Schumacher, J. Sperling, Physical Review
A 111 (2025).
date_created: 2025-09-12T10:37:34Z
date_updated: 2025-09-12T10:42:16Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '706'
- _id: '35'
- _id: '230'
- _id: '623'
- _id: '429'
doi: 10.1103/physreva.111.032404
intvolume: ' 111'
issue: '3'
language:
- iso: eng
project:
- _id: '53'
name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten
zu funktionellen Strukturen'
- _id: '54'
name: TRR 142 - Project Area A
- _id: '56'
name: TRR 142 - Project Area C
- _id: '61'
name: 'TRR 142; TP A04: Nichtlineare Quantenprozesstomographie und Photonik mit
Polaritonen in Mikrokavitäten'
- _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 A
publication_identifier:
issn:
- 2469-9926
- 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Entanglement between dependent degrees of freedom: Quasiparticle correlations'
type: journal_article
user_id: '16199'
volume: 111
year: '2025'
...
---
_id: '61246'
abstract:
- lang: eng
text: "Abstract\r\n The time-dependent
one-dimensional nonlinear Schrödinger equation (NLSE) is solved numerically by
a hybrid pseudospectral-variational quantum algorithm that connects a pseudospectral
step for the Hamiltonian term with a variational step for the nonlinear term.
The Hamiltonian term is treated as an integrating factor by forward and backward
Fourier transforms, which are here carried out classically. This split allows
us to avoid higher-order time integration schemes, to apply a first-order explicit
time stepping for the remaining nonlinear NLSE term in a variational algorithm
block, and thus to avoid numerical instabilities. We demonstrate that the analytical
solution is reproduced with a small root mean square error for a long time interval
over which a nonlinear soliton propagates significantly forward in space while
keeping its shape. We analyze the accuracy and complexity of the quantum algorithm,
the expressibility of the ansatz circuit and compare it with classical approaches.
Furthermore, we investigate the influence of algorithm parameters on the accuracy
of the results, including the temporal step width and the depth of the quantum
circuit."
article_number: '23478'
author:
- first_name: Nikolas
full_name: Köcher, Nikolas
id: '79191'
last_name: Köcher
- first_name: Hendrik
full_name: Rose, Hendrik
id: '55958'
last_name: Rose
orcid: 0000-0002-3079-5428
- first_name: Sachin S.
full_name: Bharadwaj, Sachin S.
last_name: Bharadwaj
- first_name: Jörg
full_name: Schumacher, Jörg
last_name: Schumacher
- first_name: Stefan
full_name: Schumacher, Stefan
id: '27271'
last_name: Schumacher
orcid: 0000-0003-4042-4951
citation:
ama: Köcher N, Rose H, Bharadwaj SS, Schumacher J, Schumacher S. Numerical solution
of nonlinear Schrödinger equation by a hybrid pseudospectral-variational quantum
algorithm. Scientific Reports. 2025;15(1). doi:10.1038/s41598-025-05660-3
apa: Köcher, N., Rose, H., Bharadwaj, S. S., Schumacher, J., & Schumacher, S.
(2025). Numerical solution of nonlinear Schrödinger equation by a hybrid pseudospectral-variational
quantum algorithm. Scientific Reports, 15(1), Article 23478. https://doi.org/10.1038/s41598-025-05660-3
bibtex: '@article{Köcher_Rose_Bharadwaj_Schumacher_Schumacher_2025, title={Numerical
solution of nonlinear Schrödinger equation by a hybrid pseudospectral-variational
quantum algorithm}, volume={15}, DOI={10.1038/s41598-025-05660-3},
number={123478}, journal={Scientific Reports}, publisher={Springer Science and
Business Media LLC}, author={Köcher, Nikolas and Rose, Hendrik and Bharadwaj,
Sachin S. and Schumacher, Jörg and Schumacher, Stefan}, year={2025} }'
chicago: Köcher, Nikolas, Hendrik Rose, Sachin S. Bharadwaj, Jörg Schumacher, and
Stefan Schumacher. “Numerical Solution of Nonlinear Schrödinger Equation by a
Hybrid Pseudospectral-Variational Quantum Algorithm.” Scientific Reports
15, no. 1 (2025). https://doi.org/10.1038/s41598-025-05660-3.
ieee: 'N. Köcher, H. Rose, S. S. Bharadwaj, J. Schumacher, and S. Schumacher, “Numerical
solution of nonlinear Schrödinger equation by a hybrid pseudospectral-variational
quantum algorithm,” Scientific Reports, vol. 15, no. 1, Art. no. 23478,
2025, doi: 10.1038/s41598-025-05660-3.'
mla: Köcher, Nikolas, et al. “Numerical Solution of Nonlinear Schrödinger Equation
by a Hybrid Pseudospectral-Variational Quantum Algorithm.” Scientific Reports,
vol. 15, no. 1, 23478, Springer Science and Business Media LLC, 2025, doi:10.1038/s41598-025-05660-3.
short: N. Köcher, H. Rose, S.S. Bharadwaj, J. Schumacher, S. Schumacher, Scientific
Reports 15 (2025).
date_created: 2025-09-12T10:43:29Z
date_updated: 2025-09-12T10:57:22Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '35'
- _id: '230'
- _id: '27'
doi: 10.1038/s41598-025-05660-3
intvolume: ' 15'
issue: '1'
language:
- iso: eng
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
- _id: '445'
name: Hochleistungsrechner Noctua in Paderborn
publication: Scientific Reports
publication_identifier:
issn:
- 2045-2322
publication_status: published
publisher: Springer Science and Business Media LLC
status: public
title: Numerical solution of nonlinear Schrödinger equation by a hybrid pseudospectral-variational
quantum algorithm
type: journal_article
user_id: '16199'
volume: 15
year: '2025'
...
---
_id: '61249'
article_number: '024029'
author:
- first_name: Qiang
full_name: Ai, Qiang
last_name: Ai
- first_name: Jan
full_name: Wingenbach, Jan
id: '69187'
last_name: Wingenbach
- first_name: Xinmiao
full_name: Yang, Xinmiao
last_name: Yang
- first_name: Jing
full_name: Wei, Jing
last_name: Wei
- first_name: Zaharias
full_name: Hatzopoulos, Zaharias
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: Xuekai
full_name: Ma, Xuekai
id: '59416'
last_name: Ma
- first_name: Tingge
full_name: Gao, Tingge
last_name: Gao
citation:
ama: Ai Q, Wingenbach J, Yang X, et al. Optically and remotely controlling localization
of exciton-polariton condensates in a potential lattice. Physical Review Applied.
2025;23(2). doi:10.1103/physrevapplied.23.024029
apa: Ai, Q., Wingenbach, J., Yang, X., Wei, J., Hatzopoulos, Z., Savvidis, P. G.,
Schumacher, S., Ma, X., & Gao, T. (2025). Optically and remotely controlling
localization of exciton-polariton condensates in a potential lattice. Physical
Review Applied, 23(2), Article 024029. https://doi.org/10.1103/physrevapplied.23.024029
bibtex: '@article{Ai_Wingenbach_Yang_Wei_Hatzopoulos_Savvidis_Schumacher_Ma_Gao_2025,
title={Optically and remotely controlling localization of exciton-polariton condensates
in a potential lattice}, volume={23}, DOI={10.1103/physrevapplied.23.024029},
number={2024029}, journal={Physical Review Applied}, publisher={American Physical
Society (APS)}, author={Ai, Qiang and Wingenbach, Jan and Yang, Xinmiao and Wei,
Jing and Hatzopoulos, Zaharias and Savvidis, Pavlos G. and Schumacher, Stefan
and Ma, Xuekai and Gao, Tingge}, year={2025} }'
chicago: Ai, Qiang, Jan Wingenbach, Xinmiao Yang, Jing Wei, Zaharias Hatzopoulos,
Pavlos G. Savvidis, Stefan Schumacher, Xuekai Ma, and Tingge Gao. “Optically and
Remotely Controlling Localization of Exciton-Polariton Condensates in a Potential
Lattice.” Physical Review Applied 23, no. 2 (2025). https://doi.org/10.1103/physrevapplied.23.024029.
ieee: 'Q. Ai et al., “Optically and remotely controlling localization of
exciton-polariton condensates in a potential lattice,” Physical Review Applied,
vol. 23, no. 2, Art. no. 024029, 2025, doi: 10.1103/physrevapplied.23.024029.'
mla: Ai, Qiang, et al. “Optically and Remotely Controlling Localization of Exciton-Polariton
Condensates in a Potential Lattice.” Physical Review Applied, vol. 23,
no. 2, 024029, American Physical Society (APS), 2025, doi:10.1103/physrevapplied.23.024029.
short: Q. Ai, J. Wingenbach, X. Yang, J. Wei, Z. Hatzopoulos, P.G. Savvidis, S.
Schumacher, X. Ma, T. Gao, Physical Review Applied 23 (2025).
date_created: 2025-09-12T11:01:17Z
date_updated: 2025-09-12T11:02:33Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '705'
- _id: '230'
- _id: '35'
- _id: '27'
doi: 10.1103/physrevapplied.23.024029
intvolume: ' 23'
issue: '2'
language:
- iso: eng
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: Physical Review Applied
publication_identifier:
issn:
- 2331-7019
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Optically and remotely controlling localization of exciton-polariton condensates
in a potential lattice
type: journal_article
user_id: '16199'
volume: 23
year: '2025'
...
---
_id: '61351'
abstract:
- lang: eng
text: AbstractThe interaction of water molecules
with semiconductor surfaces is relevant to various optoelectronic phenomena and
physicochemical processes. Despite advances in fundamental understanding of water‐exposed
surfaces, the detailed time‐ and energy‐resolved behavior of excited electrons
remains largely unexplored. Here, the effects of water exposure on the near‐surface
electron dynamics of phosphorus‐terminated p(2×2)/c(4×2)‐reconstructed indium
phosphide (100) (P‐rich InP) are studied experimentally and matched to theoretical
calculations. The P‐rich InP surface, consisting of H‐passivated P‐dimers, serves
as a model for other P‐containing III‐V semiconductors such as gallium phosphide
(GaP) or aluminum indium phosphide (AlInP). Electron dynamics near the surface
are probed with femtosecond resolution using time‐resolved two‐photon photoemission
(tr‐2PPE), a pump‐probe spectroscopic technique. Pulsed water exposure preserves
electronic states and significantly increases lifetimes at the conduction band
minimum (CBM). Density‐functional theory (DFT) calculations attribute these findings
to suppression of surface vibrational modes in the top P‐layer by water exposure,
reducing electronic transition probabilities of near‐band‐gap surface states.
The results suggest that many near‐surface state lifetimes reported in ultra‐high
vacuum may change significantly upon electrolyte exposure. These states may thus
contribute more strongly to surface reactions than traditionally assumed. Demonstrating
this effect for the technologically relevant P‐rich InP surface opens new opportunities
in this underexplored area of surface electrochemistry.
article_number: e00463
author:
- first_name: Jonathan
full_name: Diederich, Jonathan
last_name: Diederich
- first_name: Agnieszka
full_name: Paszuk, Agnieszka
last_name: Paszuk
- first_name: Isaac Azahel
full_name: Ruiz Alvarado, Isaac Azahel
id: '79462'
last_name: Ruiz Alvarado
orcid: 0000-0002-4710-1170
- first_name: Marvin
full_name: Krenz, Marvin
last_name: Krenz
- first_name: Mohammad Amin
full_name: Zare Pour, Mohammad Amin
last_name: Zare Pour
- first_name: Diwakar Suresh
full_name: Babu, Diwakar Suresh
last_name: Babu
- first_name: Jennifer
full_name: Velazquez Rojas, Jennifer
last_name: Velazquez Rojas
- first_name: Christian
full_name: Höhn, Christian
last_name: Höhn
- first_name: Yuying
full_name: Gao, Yuying
last_name: Gao
- first_name: Klaus
full_name: Schwarzburg, Klaus
last_name: Schwarzburg
- first_name: David
full_name: Ostheimer, David
last_name: Ostheimer
- first_name: Rainer
full_name: Eichberger, Rainer
last_name: Eichberger
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
- first_name: Thomas
full_name: Hannappel, Thomas
last_name: Hannappel
- first_name: Roel van
full_name: de Krol, Roel van
last_name: de Krol
- first_name: Dennis
full_name: Friedrich, Dennis
last_name: Friedrich
citation:
ama: Diederich J, Paszuk A, Ruiz Alvarado IA, et al. Ultrafast Electron Dynamics
at the Water‐Modified InP(100) Surface. Advanced Materials Interfaces.
2025;12(16). doi:10.1002/admi.202500463
apa: Diederich, J., Paszuk, A., Ruiz Alvarado, I. A., Krenz, M., Zare Pour, M. A.,
Babu, D. S., Velazquez Rojas, J., Höhn, C., Gao, Y., Schwarzburg, K., Ostheimer,
D., Eichberger, R., Schmidt, W. G., Hannappel, T., de Krol, R. van, & Friedrich,
D. (2025). Ultrafast Electron Dynamics at the Water‐Modified InP(100) Surface.
Advanced Materials Interfaces, 12(16), Article e00463. https://doi.org/10.1002/admi.202500463
bibtex: '@article{Diederich_Paszuk_Ruiz Alvarado_Krenz_Zare Pour_Babu_Velazquez
Rojas_Höhn_Gao_Schwarzburg_et al._2025, title={Ultrafast Electron Dynamics at
the Water‐Modified InP(100) Surface}, volume={12}, DOI={10.1002/admi.202500463},
number={16e00463}, journal={Advanced Materials Interfaces}, publisher={Wiley},
author={Diederich, Jonathan and Paszuk, Agnieszka and Ruiz Alvarado, Isaac Azahel
and Krenz, Marvin and Zare Pour, Mohammad Amin and Babu, Diwakar Suresh and Velazquez
Rojas, Jennifer and Höhn, Christian and Gao, Yuying and Schwarzburg, Klaus and
et al.}, year={2025} }'
chicago: Diederich, Jonathan, Agnieszka Paszuk, Isaac Azahel Ruiz Alvarado, Marvin
Krenz, Mohammad Amin Zare Pour, Diwakar Suresh Babu, Jennifer Velazquez Rojas,
et al. “Ultrafast Electron Dynamics at the Water‐Modified InP(100) Surface.” Advanced
Materials Interfaces 12, no. 16 (2025). https://doi.org/10.1002/admi.202500463.
ieee: 'J. Diederich et al., “Ultrafast Electron Dynamics at the Water‐Modified
InP(100) Surface,” Advanced Materials Interfaces, vol. 12, no. 16, Art.
no. e00463, 2025, doi: 10.1002/admi.202500463.'
mla: Diederich, Jonathan, et al. “Ultrafast Electron Dynamics at the Water‐Modified
InP(100) Surface.” Advanced Materials Interfaces, vol. 12, no. 16, e00463,
Wiley, 2025, doi:10.1002/admi.202500463.
short: J. Diederich, A. Paszuk, I.A. Ruiz Alvarado, M. Krenz, M.A. Zare Pour, D.S.
Babu, J. Velazquez Rojas, C. Höhn, Y. Gao, K. Schwarzburg, D. Ostheimer, R. Eichberger,
W.G. Schmidt, T. Hannappel, R. van de Krol, D. Friedrich, Advanced Materials Interfaces
12 (2025).
date_created: 2025-09-18T11:03:16Z
date_updated: 2025-09-18T11:06:59Z
department:
- _id: '15'
- _id: '170'
- _id: '295'
- _id: '35'
- _id: '230'
- _id: '27'
- _id: '429'
doi: 10.1002/admi.202500463
intvolume: ' 12'
issue: '16'
language:
- iso: eng
project:
- _id: '53'
name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten
zu funktionellen Strukturen'
- _id: '55'
name: TRR 142 - Project Area B
- _id: '168'
name: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat
(B07*)
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: Advanced Materials Interfaces
publication_identifier:
issn:
- 2196-7350
- 2196-7350
publication_status: published
publisher: Wiley
status: public
title: Ultrafast Electron Dynamics at the Water‐Modified InP(100) Surface
type: journal_article
user_id: '16199'
volume: 12
year: '2025'
...
---
_id: '61356'
abstract:
- lang: eng
text: First-principles calculations reveal how topological defects in semiconducting
carbon nanotubes trap triplet excitons and enable single-photon emission at telecom
wavelengths, offering new insights into their potential for photonic devices.
author:
- first_name: Timur
full_name: Biktagirov, Timur
id: '65612'
last_name: Biktagirov
- first_name: Uwe
full_name: Gerstmann, Uwe
id: '171'
last_name: Gerstmann
orcid: 0000-0002-4476-223X
- first_name: Wolf Gero
full_name: Schmidt, Wolf Gero
id: '468'
last_name: Schmidt
orcid: 0000-0002-2717-5076
citation:
ama: Biktagirov T, Gerstmann U, Schmidt WG. Topological defects in semiconducting
carbon nanotubes as triplet exciton traps and single-photon emitters. Nanoscale.
2025;17(11):6884-6891. doi:10.1039/d4nr03904a
apa: Biktagirov, T., Gerstmann, U., & Schmidt, W. G. (2025). Topological defects
in semiconducting carbon nanotubes as triplet exciton traps and single-photon
emitters. Nanoscale, 17(11), 6884–6891. https://doi.org/10.1039/d4nr03904a
bibtex: '@article{Biktagirov_Gerstmann_Schmidt_2025, title={Topological defects
in semiconducting carbon nanotubes as triplet exciton traps and single-photon
emitters}, volume={17}, DOI={10.1039/d4nr03904a},
number={11}, journal={Nanoscale}, publisher={Royal Society of Chemistry (RSC)},
author={Biktagirov, Timur and Gerstmann, Uwe and Schmidt, Wolf Gero}, year={2025},
pages={6884–6891} }'
chicago: 'Biktagirov, Timur, Uwe Gerstmann, and Wolf Gero Schmidt. “Topological
Defects in Semiconducting Carbon Nanotubes as Triplet Exciton Traps and Single-Photon
Emitters.” Nanoscale 17, no. 11 (2025): 6884–91. https://doi.org/10.1039/d4nr03904a.'
ieee: 'T. Biktagirov, U. Gerstmann, and W. G. Schmidt, “Topological defects in semiconducting
carbon nanotubes as triplet exciton traps and single-photon emitters,” Nanoscale,
vol. 17, no. 11, pp. 6884–6891, 2025, doi: 10.1039/d4nr03904a.'
mla: Biktagirov, Timur, et al. “Topological Defects in Semiconducting Carbon Nanotubes
as Triplet Exciton Traps and Single-Photon Emitters.” Nanoscale, vol. 17,
no. 11, Royal Society of Chemistry (RSC), 2025, pp. 6884–91, doi:10.1039/d4nr03904a.
short: T. Biktagirov, U. Gerstmann, W.G. Schmidt, Nanoscale 17 (2025) 6884–6891.
date_created: 2025-09-18T11:23:25Z
date_updated: 2025-09-18T11:26:23Z
department:
- _id: '15'
- _id: '170'
- _id: '295'
- _id: '790'
- _id: '35'
- _id: '230'
- _id: '27'
- _id: '429'
doi: 10.1039/d4nr03904a
intvolume: ' 17'
issue: '11'
language:
- iso: eng
page: 6884-6891
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
- _id: '53'
name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten
zu funktionellen Strukturen'
- _id: '54'
name: TRR 142 - Project Area A
- _id: '55'
name: TRR 142 - Project Area B
- _id: '168'
name: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat
(B07*)
- _id: '166'
name: TRR 142 - Subproject A11
publication: Nanoscale
publication_identifier:
issn:
- 2040-3364
- 2040-3372
publication_status: published
publisher: Royal Society of Chemistry (RSC)
status: public
title: Topological defects in semiconducting carbon nanotubes as triplet exciton traps
and single-photon emitters
type: journal_article
user_id: '16199'
volume: 17
year: '2025'
...
---
_id: '58519'
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'
author:
- first_name: Denis A.
full_name: Kopylov, Denis A.
last_name: Kopylov
- 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
citation:
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
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
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} }'
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.
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.'
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.
short: D.A. Kopylov, T. Meier, P.R. Sharapova, Quantum 9 (2025).
date_created: 2025-02-05T12:57:37Z
date_updated: 2025-09-18T13:22:26Z
department:
- _id: '15'
- _id: '569'
- _id: '170'
- _id: '293'
- _id: '35'
- _id: '230'
- _id: '623'
- _id: '27'
doi: 10.22331/q-2025-02-04-1621
intvolume: ' 9'
language:
- iso: eng
project:
- _id: '266'
name: 'PhoQC: PhoQC: Photonisches Quantencomputing'
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: Quantum
publication_identifier:
issn:
- 2521-327X
publication_status: published
publisher: Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften
status: public
title: Theory of Multimode Squeezed Light Generation in Lossy Media
type: journal_article
user_id: '16199'
volume: 9
year: '2025'
...
---
_id: '61279'
abstract:
- lang: eng
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.
article_number: '4431'
article_type: review
author:
- first_name: Michael
full_name: Neugum, Michael
id: '80813'
last_name: Neugum
- first_name: Arno
full_name: Schindlmayr, Arno
id: '458'
last_name: Schindlmayr
orcid: 0000-0002-4855-071X
citation:
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'
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'
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} }'
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.'
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.'
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.'
short: M. Neugum, A. Schindlmayr, Materials 18 (2025).
date_created: 2025-09-15T16:14:59Z
date_updated: 2025-10-10T07:31:23Z
ddc:
- '530'
department:
- _id: '296'
- _id: '15'
- _id: '170'
- _id: '35'
- _id: '230'
doi: 10.3390/ma18184431
external_id:
isi:
- '001580599300001'
file:
- access_level: open_access
content_type: application/pdf
creator: schindlm
date_created: 2025-09-24T07:19:36Z
date_updated: 2025-09-24T07:19:36Z
description: Creative Commons Attribution 4.0 International Public License (CC BY
4.0)
file_id: '61422'
file_name: materials-18-04431.pdf
file_size: 611341
relation: main_file
title: 'Ab initio calculations of spin waves: A review of theoretical approaches
and applications'
file_date_updated: 2025-09-24T07:19:36Z
has_accepted_license: '1'
intvolume: ' 18'
isi: '1'
issue: '18'
language:
- iso: eng
oa: '1'
publication: Materials
publication_identifier:
eissn:
- 1996-1944
publication_status: published
publisher: MDPI
quality_controlled: '1'
status: public
title: 'Ab initio calculations of spin waves: A review of theoretical approaches and
applications'
type: journal_article
user_id: '458'
volume: 18
year: '2025'
...
---
_id: '60959'
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.
article_number: '34'
article_type: original
author:
- first_name: Maximilian Tim
full_name: Meyer, Maximilian Tim
id: '77895'
last_name: Meyer
orcid: 0009-0003-4899-0920
- first_name: Arno
full_name: Schindlmayr, Arno
id: '458'
last_name: Schindlmayr
orcid: 0000-0002-4855-071X
citation:
ama: Meyer MT, Schindlmayr A. Generalized Miller formulae for quantum anharmonic
oscillators. Dynamics. 2025;5(3). doi: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
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} }'
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.
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.'
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).
date_created: 2025-08-20T09:46:13Z
date_updated: 2025-10-10T07:29:36Z
ddc:
- '530'
department:
- _id: '296'
- _id: '230'
- _id: '15'
- _id: '170'
- _id: '35'
doi: 10.3390/dynamics5030034
external_id:
isi:
- '001581270200001'
file:
- access_level: open_access
content_type: application/pdf
creator: schindlm
date_created: 2025-08-28T12:23:26Z
date_updated: 2025-08-28T12:27:05Z
description: Creative Commons Attribution 4.0 International Public License (CC BY
4.0)
file_id: '61056'
file_name: dynamics-05-00034.pdf
file_size: 375897
relation: main_file
title: Generalized Miller formulae for quantum anharmonic oscillators
file_date_updated: 2025-08-28T12:27:05Z
has_accepted_license: '1'
intvolume: ' 5'
isi: '1'
issue: '3'
language:
- iso: eng
oa: '1'
publication: Dynamics
publication_identifier:
eissn:
- 2673-8716
publication_status: published
publisher: MDPI
quality_controlled: '1'
status: public
title: Generalized Miller formulae for quantum anharmonic oscillators
type: journal_article
user_id: '458'
volume: 5
year: '2025'
...
---
_id: '62867'
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."
article_number: e01874
author:
- first_name: Ying
full_name: Ji, Ying
last_name: Ji
- first_name: Xuekai
full_name: Ma, Xuekai
id: '59416'
last_name: Ma
- first_name: Han
full_name: Huang, Han
last_name: Huang
- first_name: Yibo
full_name: Deng, Yibo
last_name: Deng
- first_name: Pingyang
full_name: Wang, Pingyang
last_name: Wang
- first_name: Teng
full_name: Long, Teng
last_name: Long
- first_name: Yuan
full_name: Li, Yuan
last_name: Li
- first_name: Ruiyang
full_name: Zhao, Ruiyang
last_name: Zhao
- first_name: Yunfei
full_name: Li, Yunfei
last_name: Li
- first_name: Cunbin
full_name: An, Cunbin
last_name: An
- first_name: Stefan
full_name: Schumacher, Stefan
id: '27271'
last_name: Schumacher
orcid: 0000-0003-4042-4951
- first_name: Chunling
full_name: Gu, Chunling
last_name: Gu
- first_name: Bo
full_name: Liao, Bo
last_name: Liao
- first_name: Hongbing
full_name: Fu, Hongbing
last_name: Fu
- first_name: Qing
full_name: Liao, Qing
last_name: Liao
citation:
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
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
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} }'
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.
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.'
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.
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).
date_created: 2025-12-04T12:33:48Z
date_updated: 2025-12-04T12:34:45Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '705'
- _id: '35'
- _id: '230'
doi: 10.1002/lpor.202501874
language:
- iso: eng
publication: Laser & Photonics Reviews
publication_identifier:
issn:
- 1863-8880
- 1863-8899
publication_status: published
publisher: Wiley
status: public
title: Molecular Orientation‐Dependent Photonic Spin–Orbit Coupling in Organic Microcavities
Filled with 2D Polymorphic Crystals
type: journal_article
user_id: '16199'
year: '2025'
...
---
_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: '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'
...