---
_id: '34138'
abstract:
- lang: eng
text: "Variational Quantum Algorithms (VQAs), such as the Quantum Approximate\r\nOptimization
Algorithm (QAOA) of [Farhi, Goldstone, Gutmann, 2014], have seen\r\nintense study
towards near-term applications on quantum hardware. A crucial\r\nparameter for
VQAs is the depth of the variational ansatz used - the smaller\r\nthe depth, the
more amenable the ansatz is to near-term quantum hardware in\r\nthat it gives
the circuit a chance to be fully executed before the system\r\ndecoheres. This
potential for depth reduction has made VQAs a staple of Noisy\r\nIntermediate-Scale
Quantum (NISQ)-era research.\r\n In this work, we show that approximating the
optimal depth for a given VQA\r\nansatz is intractable. Formally, we show that
for any constant $\\epsilon>0$, it\r\nis QCMA-hard to approximate the optimal
depth of a VQA ansatz within\r\nmultiplicative factor $N^{1-\\epsilon}$, for $N$
denoting the encoding size of\r\nthe VQA instance. (Here, Quantum Classical Merlin-Arthur
(QCMA) is a quantum\r\ngeneralization of NP.) We then show that this hardness
persists even in the\r\n\"simpler\" setting of QAOAs. To our knowledge, this yields
the first natural\r\nQCMA-hard-to-approximate problems. To achieve these results,
we bypass the need\r\nfor a PCP theorem for QCMA by appealing to the disperser-based
NP-hardness of\r\napproximation construction of [Umans, FOCS 1999]."
author:
- first_name: Lennart
full_name: Bittel, Lennart
last_name: Bittel
- first_name: Sevag
full_name: Gharibian, Sevag
id: '71541'
last_name: Gharibian
orcid: 0000-0002-9992-3379
- first_name: Martin
full_name: Kliesch, Martin
last_name: Kliesch
citation:
ama: 'Bittel L, Gharibian S, Kliesch M. The Optimal Depth of Variational Quantum
Algorithms Is QCMA-Hard to Approximate. In: Proceedings of the 38th Computational
Complexity Conference (CCC). Vol 264. Leibniz International Proceedings in
Informatics (LIPIcs). ; 2023:34:1-34:24. doi:10.4230/LIPIcs.CCC.2023.34'
apa: Bittel, L., Gharibian, S., & Kliesch, M. (2023). The Optimal Depth of Variational
Quantum Algorithms Is QCMA-Hard to Approximate. Proceedings of the 38th Computational
Complexity Conference (CCC), 264(34), 34:1-34:24. https://doi.org/10.4230/LIPIcs.CCC.2023.34
bibtex: '@inproceedings{Bittel_Gharibian_Kliesch_2023, series={Leibniz International
Proceedings in Informatics (LIPIcs)}, title={The Optimal Depth of Variational
Quantum Algorithms Is QCMA-Hard to Approximate}, volume={264}, DOI={10.4230/LIPIcs.CCC.2023.34},
number={34}, booktitle={Proceedings of the 38th Computational Complexity Conference
(CCC)}, author={Bittel, Lennart and Gharibian, Sevag and Kliesch, Martin}, year={2023},
pages={34:1-34:24}, collection={Leibniz International Proceedings in Informatics
(LIPIcs)} }'
chicago: Bittel, Lennart, Sevag Gharibian, and Martin Kliesch. “The Optimal Depth
of Variational Quantum Algorithms Is QCMA-Hard to Approximate.” In Proceedings
of the 38th Computational Complexity Conference (CCC), 264:34:1-34:24. Leibniz
International Proceedings in Informatics (LIPIcs), 2023. https://doi.org/10.4230/LIPIcs.CCC.2023.34.
ieee: 'L. Bittel, S. Gharibian, and M. Kliesch, “The Optimal Depth of Variational
Quantum Algorithms Is QCMA-Hard to Approximate,” in Proceedings of the 38th
Computational Complexity Conference (CCC), 2023, vol. 264, no. 34, p. 34:1-34:24,
doi: 10.4230/LIPIcs.CCC.2023.34.'
mla: Bittel, Lennart, et al. “The Optimal Depth of Variational Quantum Algorithms
Is QCMA-Hard to Approximate.” Proceedings of the 38th Computational Complexity
Conference (CCC), vol. 264, no. 34, 2023, p. 34:1-34:24, doi:10.4230/LIPIcs.CCC.2023.34.
short: 'L. Bittel, S. Gharibian, M. Kliesch, in: Proceedings of the 38th Computational
Complexity Conference (CCC), 2023, p. 34:1-34:24.'
date_created: 2022-11-24T08:07:56Z
date_updated: 2023-07-10T14:33:00Z
department:
- _id: '623'
- _id: '7'
doi: 10.4230/LIPIcs.CCC.2023.34
external_id:
arxiv:
- '2211.12519'
intvolume: ' 264'
issue: '34'
language:
- iso: eng
page: 34:1-34:24
publication: Proceedings of the 38th Computational Complexity Conference (CCC)
publication_status: published
series_title: Leibniz International Proceedings in Informatics (LIPIcs)
status: public
title: The Optimal Depth of Variational Quantum Algorithms Is QCMA-Hard to Approximate
type: conference
user_id: '71541'
volume: 264
year: '2023'
...
---
_id: '46133'
article_number: '165426'
author:
- first_name: Frederik
full_name: Bopp, Frederik
last_name: Bopp
- first_name: Johannes
full_name: Schall, Johannes
last_name: Schall
- first_name: Nikolai
full_name: Bart, Nikolai
last_name: Bart
- first_name: Florian
full_name: Vögl, Florian
last_name: Vögl
- first_name: Charlotte
full_name: Cullip, Charlotte
last_name: Cullip
- first_name: Friedrich
full_name: Sbresny, Friedrich
last_name: Sbresny
- first_name: Katarina
full_name: Boos, Katarina
last_name: Boos
- first_name: Christopher
full_name: Thalacker, Christopher
last_name: Thalacker
- first_name: Michelle
full_name: Lienhart, Michelle
last_name: Lienhart
- first_name: Sven
full_name: Rodt, Sven
last_name: Rodt
- first_name: Dirk
full_name: Reuter, Dirk
id: '37763'
last_name: Reuter
- first_name: Arne
full_name: Ludwig, Arne
last_name: Ludwig
- first_name: Andreas D.
full_name: Wieck, Andreas D.
last_name: Wieck
- first_name: Stephan
full_name: Reitzenstein, Stephan
last_name: Reitzenstein
- first_name: Kai
full_name: Müller, Kai
last_name: Müller
- first_name: Jonathan J.
full_name: Finley, Jonathan J.
last_name: Finley
citation:
ama: Bopp F, Schall J, Bart N, et al. Coherent driving of direct and indirect excitons
in a quantum dot molecule. Physical Review B. 2023;107(16). doi:10.1103/physrevb.107.165426
apa: Bopp, F., Schall, J., Bart, N., Vögl, F., Cullip, C., Sbresny, F., Boos, K.,
Thalacker, C., Lienhart, M., Rodt, S., Reuter, D., Ludwig, A., Wieck, A. D., Reitzenstein,
S., Müller, K., & Finley, J. J. (2023). Coherent driving of direct and indirect
excitons in a quantum dot molecule. Physical Review B, 107(16),
Article 165426. https://doi.org/10.1103/physrevb.107.165426
bibtex: '@article{Bopp_Schall_Bart_Vögl_Cullip_Sbresny_Boos_Thalacker_Lienhart_Rodt_et
al._2023, title={Coherent driving of direct and indirect excitons in a quantum
dot molecule}, volume={107}, DOI={10.1103/physrevb.107.165426},
number={16165426}, journal={Physical Review B}, publisher={American Physical Society
(APS)}, author={Bopp, Frederik and Schall, Johannes and Bart, Nikolai and Vögl,
Florian and Cullip, Charlotte and Sbresny, Friedrich and Boos, Katarina and Thalacker,
Christopher and Lienhart, Michelle and Rodt, Sven and et al.}, year={2023} }'
chicago: Bopp, Frederik, Johannes Schall, Nikolai Bart, Florian Vögl, Charlotte
Cullip, Friedrich Sbresny, Katarina Boos, et al. “Coherent Driving of Direct and
Indirect Excitons in a Quantum Dot Molecule.” Physical Review B 107, no.
16 (2023). https://doi.org/10.1103/physrevb.107.165426.
ieee: 'F. Bopp et al., “Coherent driving of direct and indirect excitons
in a quantum dot molecule,” Physical Review B, vol. 107, no. 16, Art. no.
165426, 2023, doi: 10.1103/physrevb.107.165426.'
mla: Bopp, Frederik, et al. “Coherent Driving of Direct and Indirect Excitons in
a Quantum Dot Molecule.” Physical Review B, vol. 107, no. 16, 165426, American
Physical Society (APS), 2023, doi:10.1103/physrevb.107.165426.
short: F. Bopp, J. Schall, N. Bart, F. Vögl, C. Cullip, F. Sbresny, K. Boos, C.
Thalacker, M. Lienhart, S. Rodt, D. Reuter, A. Ludwig, A.D. Wieck, S. Reitzenstein,
K. Müller, J.J. Finley, Physical Review B 107 (2023).
date_created: 2023-07-25T08:20:20Z
date_updated: 2023-07-25T08:21:13Z
department:
- _id: '15'
- _id: '230'
doi: 10.1103/physrevb.107.165426
intvolume: ' 107'
issue: '16'
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: Coherent driving of direct and indirect excitons in a quantum dot molecule
type: journal_article
user_id: '42514'
volume: 107
year: '2023'
...
---
_id: '46132'
author:
- first_name: Mario
full_name: Littmann, Mario
last_name: Littmann
- first_name: Dirk
full_name: Reuter, Dirk
id: '37763'
last_name: Reuter
- first_name: Donat Josef
full_name: As, Donat Josef
id: '14'
last_name: As
orcid: 0000-0003-1121-3565
citation:
ama: Littmann M, Reuter D, As DJ. Remote Epitaxy of Cubic Gallium Nitride on Graphene‐Covered
3C‐SiC Substrates by Plasma‐Assisted Molecular Beam Epitaxy. physica status
solidi (b). 2023;260(7). doi:10.1002/pssb.202300034
apa: Littmann, M., Reuter, D., & As, D. J. (2023). Remote Epitaxy of Cubic Gallium
Nitride on Graphene‐Covered 3C‐SiC Substrates by Plasma‐Assisted Molecular Beam
Epitaxy. Physica Status Solidi (b), 260(7). https://doi.org/10.1002/pssb.202300034
bibtex: '@article{Littmann_Reuter_As_2023, title={Remote Epitaxy of Cubic Gallium
Nitride on Graphene‐Covered 3C‐SiC Substrates by Plasma‐Assisted Molecular Beam
Epitaxy}, volume={260}, DOI={10.1002/pssb.202300034},
number={7}, journal={physica status solidi (b)}, publisher={Wiley}, author={Littmann,
Mario and Reuter, Dirk and As, Donat Josef}, year={2023} }'
chicago: Littmann, Mario, Dirk Reuter, and Donat Josef As. “Remote Epitaxy of Cubic
Gallium Nitride on Graphene‐Covered 3C‐SiC Substrates by Plasma‐Assisted Molecular
Beam Epitaxy.” Physica Status Solidi (b) 260, no. 7 (2023). https://doi.org/10.1002/pssb.202300034.
ieee: 'M. Littmann, D. Reuter, and D. J. As, “Remote Epitaxy of Cubic Gallium Nitride
on Graphene‐Covered 3C‐SiC Substrates by Plasma‐Assisted Molecular Beam Epitaxy,”
physica status solidi (b), vol. 260, no. 7, 2023, doi: 10.1002/pssb.202300034.'
mla: Littmann, Mario, et al. “Remote Epitaxy of Cubic Gallium Nitride on Graphene‐Covered
3C‐SiC Substrates by Plasma‐Assisted Molecular Beam Epitaxy.” Physica Status
Solidi (b), vol. 260, no. 7, Wiley, 2023, doi:10.1002/pssb.202300034.
short: M. Littmann, D. Reuter, D.J. As, Physica Status Solidi (b) 260 (2023).
date_created: 2023-07-25T08:06:13Z
date_updated: 2023-07-25T08:07:20Z
department:
- _id: '15'
- _id: '230'
doi: 10.1002/pssb.202300034
intvolume: ' 260'
issue: '7'
keyword:
- Condensed Matter Physics
- Electronic
- Optical and Magnetic Materials
language:
- iso: eng
publication: physica status solidi (b)
publication_identifier:
issn:
- 0370-1972
- 1521-3951
publication_status: published
publisher: Wiley
status: public
title: Remote Epitaxy of Cubic Gallium Nitride on Graphene‐Covered 3C‐SiC Substrates
by Plasma‐Assisted Molecular Beam Epitaxy
type: journal_article
user_id: '42514'
volume: 260
year: '2023'
...
---
_id: '46138'
abstract:
- lang: eng
text: This work reports a fully guided setup for single-mode squeezing on
integrated titanium-indiffused periodically poled nonlinear resonators. A continuous-wave
laser beam is delivered and the squeezed field is collected by single-mode fibers;
up to −3.17(9) dB of useful squeezing is available in fibers. To showcase the
usefulness of such a fiber-coupled device, we applied the generated squeezed light
in a fiber-based phase sensing experiment, showing a quantum enhancement in the
signal-to-noise ratio of 0.35 dB. Moreover, our investigation of the effect of
photorefraction on the cavity resonance condition suggests that it causes system
instabilities at high powers.
article_number: '2999'
article_type: original
author:
- first_name: Renato
full_name: Domeneguetti, Renato
last_name: Domeneguetti
- first_name: Michael
full_name: Stefszky, Michael
id: '42777'
last_name: Stefszky
- 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: Ulrik L.
full_name: Andersen, Ulrik L.
last_name: Andersen
- first_name: Jonas S.
full_name: Neergaard-Nielsen, Jonas S.
last_name: Neergaard-Nielsen
- first_name: Tobias
full_name: Gehring, Tobias
last_name: Gehring
citation:
ama: Domeneguetti R, Stefszky M, Herrmann H, et al. Fully guided and phase locked
Ti:PPLN waveguide squeezing for applications in quantum sensing. Optics Letters.
2023;48(11). doi:10.1364/ol.486654
apa: Domeneguetti, R., Stefszky, M., Herrmann, H., Silberhorn, C., Andersen, U.
L., Neergaard-Nielsen, J. S., & Gehring, T. (2023). Fully guided and phase
locked Ti:PPLN waveguide squeezing for applications in quantum sensing. Optics
Letters, 48(11), Article 2999. https://doi.org/10.1364/ol.486654
bibtex: '@article{Domeneguetti_Stefszky_Herrmann_Silberhorn_Andersen_Neergaard-Nielsen_Gehring_2023,
title={Fully guided and phase locked Ti:PPLN waveguide squeezing for applications
in quantum sensing}, volume={48}, DOI={10.1364/ol.486654},
number={112999}, journal={Optics Letters}, publisher={Optica Publishing Group},
author={Domeneguetti, Renato and Stefszky, Michael and Herrmann, Harald and Silberhorn,
Christine and Andersen, Ulrik L. and Neergaard-Nielsen, Jonas S. and Gehring,
Tobias}, year={2023} }'
chicago: Domeneguetti, Renato, Michael Stefszky, Harald Herrmann, Christine Silberhorn,
Ulrik L. Andersen, Jonas S. Neergaard-Nielsen, and Tobias Gehring. “Fully Guided
and Phase Locked Ti:PPLN Waveguide Squeezing for Applications in Quantum Sensing.”
Optics Letters 48, no. 11 (2023). https://doi.org/10.1364/ol.486654.
ieee: 'R. Domeneguetti et al., “Fully guided and phase locked Ti:PPLN waveguide
squeezing for applications in quantum sensing,” Optics Letters, vol. 48,
no. 11, Art. no. 2999, 2023, doi: 10.1364/ol.486654.'
mla: Domeneguetti, Renato, et al. “Fully Guided and Phase Locked Ti:PPLN Waveguide
Squeezing for Applications in Quantum Sensing.” Optics Letters, vol. 48,
no. 11, 2999, Optica Publishing Group, 2023, doi:10.1364/ol.486654.
short: R. Domeneguetti, M. Stefszky, H. Herrmann, C. Silberhorn, U.L. Andersen,
J.S. Neergaard-Nielsen, T. Gehring, Optics Letters 48 (2023).
date_created: 2023-07-25T10:35:24Z
date_updated: 2023-07-25T10:58:05Z
department:
- _id: '230'
- _id: '623'
- _id: '288'
doi: 10.1364/ol.486654
intvolume: ' 48'
issue: '11'
keyword:
- Atomic and Molecular Physics
- and Optics
language:
- iso: eng
project:
- _id: '218'
name: 'UNIQORN: UNIQORN - Affordable Quantum Communication for Everyone - EU Quantum
Flagship Project'
publication: Optics Letters
publication_identifier:
issn:
- 0146-9592
- 1539-4794
publication_status: published
publisher: Optica Publishing Group
quality_controlled: '1'
status: public
title: Fully guided and phase locked Ti:PPLN waveguide squeezing for applications
in quantum sensing
type: journal_article
user_id: '216'
volume: 48
year: '2023'
...
---
_id: '46120'
abstract:
- lang: eng
text: The rise of exascale supercomputers has fueled competition among GPU vendors,
driving lattice QCD developers to write code that supports multiple APIs. Moreover,
new developments in algorithms and physics research require frequent updates to
existing software. These challenges have to be balanced against constantly changing
personnel. At the same time, there is a wide range of applications for HISQ fermions
in QCD studies. This situation encourages the development of software featuring
a HISQ action that is flexible, high-performing, open source, easy to use, and
easy to adapt. In this technical paper, we explain the design strategy, provide
implementation details, list available algorithms and modules, and show key performance
indicators for SIMULATeQCD, a simple multi-GPU lattice code for large-scale QCD
calculations, mainly developed and used by the HotQCD collaboration. The code
is publicly available on GitHub.
author:
- first_name: Lukas
full_name: Mazur, Lukas
id: '90492'
last_name: Mazur
orcid: ' 0000-0001-6304-7082'
- first_name: Dennis
full_name: Bollweg, Dennis
last_name: Bollweg
- first_name: David A.
full_name: Clarke, David A.
last_name: Clarke
- first_name: Luis
full_name: Altenkort, Luis
last_name: Altenkort
- first_name: Olaf
full_name: Kaczmarek, Olaf
last_name: Kaczmarek
- first_name: Rasmus
full_name: Larsen, Rasmus
last_name: Larsen
- first_name: Hai-Tao
full_name: Shu, Hai-Tao
last_name: Shu
- first_name: Jishnu
full_name: Goswami, Jishnu
last_name: Goswami
- first_name: Philipp
full_name: Scior, Philipp
last_name: Scior
- first_name: Hauke
full_name: Sandmeyer, Hauke
last_name: Sandmeyer
- first_name: Marius
full_name: Neumann, Marius
last_name: Neumann
- first_name: Henrik
full_name: Dick, Henrik
last_name: Dick
- first_name: Sajid
full_name: Ali, Sajid
last_name: Ali
- first_name: Jangho
full_name: Kim, Jangho
last_name: Kim
- first_name: Christian
full_name: Schmidt, Christian
last_name: Schmidt
- first_name: Peter
full_name: Petreczky, Peter
last_name: Petreczky
- first_name: Swagato
full_name: Mukherjee, Swagato
last_name: Mukherjee
citation:
ama: 'Mazur L, Bollweg D, Clarke DA, et al. SIMULATeQCD: A simple multi-GPU lattice
code for QCD calculations. Computer Physics Communications. Published online
2023. doi:10.48550/ARXIV.2306.01098'
apa: 'Mazur, L., Bollweg, D., Clarke, D. A., Altenkort, L., Kaczmarek, O., Larsen,
R., Shu, H.-T., Goswami, J., Scior, P., Sandmeyer, H., Neumann, M., Dick, H.,
Ali, S., Kim, J., Schmidt, C., Petreczky, P., & Mukherjee, S. (2023). SIMULATeQCD:
A simple multi-GPU lattice code for QCD calculations. Computer Physics Communications.
https://doi.org/10.48550/ARXIV.2306.01098'
bibtex: '@article{Mazur_Bollweg_Clarke_Altenkort_Kaczmarek_Larsen_Shu_Goswami_Scior_Sandmeyer_et
al._2023, title={SIMULATeQCD: A simple multi-GPU lattice code for QCD calculations},
DOI={10.48550/ARXIV.2306.01098},
journal={Computer Physics Communications}, author={Mazur, Lukas and Bollweg, Dennis
and Clarke, David A. and Altenkort, Luis and Kaczmarek, Olaf and Larsen, Rasmus
and Shu, Hai-Tao and Goswami, Jishnu and Scior, Philipp and Sandmeyer, Hauke and
et al.}, year={2023} }'
chicago: 'Mazur, Lukas, Dennis Bollweg, David A. Clarke, Luis Altenkort, Olaf Kaczmarek,
Rasmus Larsen, Hai-Tao Shu, et al. “SIMULATeQCD: A Simple Multi-GPU Lattice Code
for QCD Calculations.” Computer Physics Communications, 2023. https://doi.org/10.48550/ARXIV.2306.01098.'
ieee: 'L. Mazur et al., “SIMULATeQCD: A simple multi-GPU lattice code for
QCD calculations,” Computer Physics Communications, 2023, doi: 10.48550/ARXIV.2306.01098.'
mla: 'Mazur, Lukas, et al. “SIMULATeQCD: A Simple Multi-GPU Lattice Code for QCD
Calculations.” Computer Physics Communications, 2023, doi:10.48550/ARXIV.2306.01098.'
short: L. Mazur, D. Bollweg, D.A. Clarke, L. Altenkort, O. Kaczmarek, R. Larsen,
H.-T. Shu, J. Goswami, P. Scior, H. Sandmeyer, M. Neumann, H. Dick, S. Ali, J.
Kim, C. Schmidt, P. Petreczky, S. Mukherjee, Computer Physics Communications (2023).
date_created: 2023-07-24T10:55:25Z
date_updated: 2023-07-26T09:21:35Z
department:
- _id: '27'
doi: 10.48550/ARXIV.2306.01098
language:
- iso: eng
publication: Computer Physics Communications
status: public
title: 'SIMULATeQCD: A simple multi-GPU lattice code for QCD calculations'
type: journal_article
user_id: '90492'
year: '2023'
...
---
_id: '46119'
article_number: '014503'
author:
- first_name: Luis
full_name: Altenkort, Luis
last_name: Altenkort
- first_name: Alexander M.
full_name: Eller, Alexander M.
last_name: Eller
- first_name: Anthony
full_name: Francis, Anthony
last_name: Francis
- first_name: Olaf
full_name: Kaczmarek, Olaf
last_name: Kaczmarek
- first_name: Lukas
full_name: Mazur, Lukas
id: '90492'
last_name: Mazur
orcid: ' 0000-0001-6304-7082'
- first_name: Guy D.
full_name: Moore, Guy D.
last_name: Moore
- first_name: Hai-Tao
full_name: Shu, Hai-Tao
last_name: Shu
citation:
ama: Altenkort L, Eller AM, Francis A, et al. Viscosity of pure-glue QCD from the
lattice. Physical Review D. 2023;108(1). doi:10.1103/physrevd.108.014503
apa: Altenkort, L., Eller, A. M., Francis, A., Kaczmarek, O., Mazur, L., Moore,
G. D., & Shu, H.-T. (2023). Viscosity of pure-glue QCD from the lattice. Physical
Review D, 108(1), Article 014503. https://doi.org/10.1103/physrevd.108.014503
bibtex: '@article{Altenkort_Eller_Francis_Kaczmarek_Mazur_Moore_Shu_2023, title={Viscosity
of pure-glue QCD from the lattice}, volume={108}, DOI={10.1103/physrevd.108.014503},
number={1014503}, journal={Physical Review D}, publisher={American Physical Society
(APS)}, author={Altenkort, Luis and Eller, Alexander M. and Francis, Anthony and
Kaczmarek, Olaf and Mazur, Lukas and Moore, Guy D. and Shu, Hai-Tao}, year={2023}
}'
chicago: Altenkort, Luis, Alexander M. Eller, Anthony Francis, Olaf Kaczmarek, Lukas
Mazur, Guy D. Moore, and Hai-Tao Shu. “Viscosity of Pure-Glue QCD from the Lattice.”
Physical Review D 108, no. 1 (2023). https://doi.org/10.1103/physrevd.108.014503.
ieee: 'L. Altenkort et al., “Viscosity of pure-glue QCD from the lattice,”
Physical Review D, vol. 108, no. 1, Art. no. 014503, 2023, doi: 10.1103/physrevd.108.014503.'
mla: Altenkort, Luis, et al. “Viscosity of Pure-Glue QCD from the Lattice.” Physical
Review D, vol. 108, no. 1, 014503, American Physical Society (APS), 2023,
doi:10.1103/physrevd.108.014503.
short: L. Altenkort, A.M. Eller, A. Francis, O. Kaczmarek, L. Mazur, G.D. Moore,
H.-T. Shu, Physical Review D 108 (2023).
date_created: 2023-07-24T10:54:18Z
date_updated: 2023-07-26T09:23:32Z
department:
- _id: '27'
doi: 10.1103/physrevd.108.014503
intvolume: ' 108'
issue: '1'
language:
- iso: eng
publication: Physical Review D
publication_identifier:
issn:
- 2470-0010
- 2470-0029
publication_status: published
publisher: American Physical Society (APS)
quality_controlled: '1'
status: public
title: Viscosity of pure-glue QCD from the lattice
type: journal_article
user_id: '90492'
volume: 108
year: '2023'
...
---
_id: '38041'
abstract:
- lang: eng
text: "While FPGA accelerator boards and their respective high-level design
tools are maturing, there is still a lack of multi-FPGA applications, libraries,
and not least, benchmarks and reference implementations towards sustained HPC
usage of these devices. As in the early days of GPUs in HPC, for workloads that
can reasonably be decoupled into loosely coupled working sets, multi-accelerator
support can be achieved by using standard communication interfaces like MPI on
the host side. However, for performance and productivity, some applications can
profit from a tighter coupling of the accelerators. FPGAs offer unique opportunities
here when extending the dataflow characteristics to their communication interfaces.\r\n
\ In this work, we extend the HPCC FPGA benchmark suite by multi-FPGA
support and three missing benchmarks that particularly characterize or stress
inter-device communication: b_eff, PTRANS, and LINPACK. With all benchmarks implemented
for current boards with Intel and Xilinx FPGAs, we established a baseline for
multi-FPGA performance. Additionally, for the communication-centric benchmarks,
we explored the potential of direct FPGA-to-FPGA communication with a circuit-switched
inter-FPGA network that is currently only available for one of the boards. The
evaluation with parallel execution on up to 26 FPGA boards makes use of one of
the largest academic FPGA installations."
author:
- first_name: Marius
full_name: Meyer, Marius
id: '40778'
last_name: Meyer
- first_name: Tobias
full_name: Kenter, Tobias
id: '3145'
last_name: Kenter
- first_name: Christian
full_name: Plessl, Christian
id: '16153'
last_name: Plessl
orcid: 0000-0001-5728-9982
citation:
ama: Meyer M, Kenter T, Plessl C. Multi-FPGA Designs and Scaling of HPC Challenge
Benchmarks via MPI and Circuit-Switched Inter-FPGA Networks. ACM Transactions
on Reconfigurable Technology and Systems. Published online 2023. doi:10.1145/3576200
apa: Meyer, M., Kenter, T., & Plessl, C. (2023). Multi-FPGA Designs and Scaling
of HPC Challenge Benchmarks via MPI and Circuit-Switched Inter-FPGA Networks.
ACM Transactions on Reconfigurable Technology and Systems. https://doi.org/10.1145/3576200
bibtex: '@article{Meyer_Kenter_Plessl_2023, title={Multi-FPGA Designs and Scaling
of HPC Challenge Benchmarks via MPI and Circuit-Switched Inter-FPGA Networks},
DOI={10.1145/3576200}, journal={ACM
Transactions on Reconfigurable Technology and Systems}, publisher={Association
for Computing Machinery (ACM)}, author={Meyer, Marius and Kenter, Tobias and Plessl,
Christian}, year={2023} }'
chicago: Meyer, Marius, Tobias Kenter, and Christian Plessl. “Multi-FPGA Designs
and Scaling of HPC Challenge Benchmarks via MPI and Circuit-Switched Inter-FPGA
Networks.” ACM Transactions on Reconfigurable Technology and Systems, 2023.
https://doi.org/10.1145/3576200.
ieee: 'M. Meyer, T. Kenter, and C. Plessl, “Multi-FPGA Designs and Scaling of HPC
Challenge Benchmarks via MPI and Circuit-Switched Inter-FPGA Networks,” ACM
Transactions on Reconfigurable Technology and Systems, 2023, doi: 10.1145/3576200.'
mla: Meyer, Marius, et al. “Multi-FPGA Designs and Scaling of HPC Challenge Benchmarks
via MPI and Circuit-Switched Inter-FPGA Networks.” ACM Transactions on Reconfigurable
Technology and Systems, Association for Computing Machinery (ACM), 2023, doi:10.1145/3576200.
short: M. Meyer, T. Kenter, C. Plessl, ACM Transactions on Reconfigurable Technology
and Systems (2023).
date_created: 2023-01-23T08:40:42Z
date_updated: 2023-07-28T08:02:05Z
department:
- _id: '27'
- _id: '518'
doi: 10.1145/3576200
keyword:
- General Computer Science
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://dl.acm.org/doi/10.1145/3576200
oa: '1'
project:
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
- _id: '4'
name: 'SFB 901 - C: SFB 901 - Project Area C'
- _id: '1'
grant_number: '160364472'
name: 'SFB 901: SFB 901'
- _id: '14'
grant_number: '160364472'
name: 'SFB 901 - C2: SFB 901 - Subproject C2'
publication: ACM Transactions on Reconfigurable Technology and Systems
publication_identifier:
issn:
- 1936-7406
- 1936-7414
publication_status: published
publisher: Association for Computing Machinery (ACM)
quality_controlled: '1'
status: public
title: Multi-FPGA Designs and Scaling of HPC Challenge Benchmarks via MPI and Circuit-Switched
Inter-FPGA Networks
type: journal_article
user_id: '24135'
year: '2023'
...
---
_id: '43228'
abstract:
- lang: eng
text: "The computation of electron repulsion integrals (ERIs) over Gaussian-type
orbitals (GTOs) is a challenging problem in quantum-mechanics-based atomistic
simulations. In practical simulations, several trillions of ERIs may have to be\r\ncomputed
for every time step.\r\nIn this work, we investigate FPGAs as accelerators for
the ERI computation. We use template parameters, here within the Intel oneAPI
tool flow, to create customized designs for 256 different ERI quartet classes,
based on their orbitals. To maximize data reuse, all intermediates are buffered
in FPGA on-chip memory with customized layout. The pre-calculation of intermediates
also helps to overcome data dependencies caused by multi-dimensional recurrence\r\nrelations.
The involved loop structures are partially or even fully unrolled for high throughput
of FPGA kernels. Furthermore, a lossy compression algorithm utilizing arbitrary
bitwidth integers is integrated in the FPGA kernels. To our\r\nbest knowledge,
this is the first work on ERI computation on FPGAs that supports more than just
the single most basic quartet class. Also, the integration of ERI computation
and compression it a novelty that is not even covered by CPU or GPU libraries
so far.\r\nOur evaluation shows that using 16-bit integer for the ERI compression,
the fastest FPGA kernels exceed the performance of 10 GERIS ($10 \\times 10^9$
ERIs per second) on one Intel Stratix 10 GX 2800 FPGA, with maximum absolute errors
around $10^{-7}$ - $10^{-5}$ Hartree. The measured throughput can be accurately
explained by a performance model. The FPGA kernels deployed on 2 FPGAs outperform
similar computations using the widely used libint reference on a two-socket server
with 40 Xeon Gold 6148 CPU cores of the same process technology by factors up
to 6.0x and on a new two-socket server with 128 EPYC 7713 CPU cores by up to 1.9x."
author:
- first_name: Xin
full_name: Wu, Xin
id: '77439'
last_name: Wu
- first_name: Tobias
full_name: Kenter, Tobias
id: '3145'
last_name: Kenter
- first_name: Robert
full_name: Schade, Robert
id: '75963'
last_name: Schade
orcid: 0000-0002-6268-539
- first_name: Thomas
full_name: Kühne, Thomas
id: '49079'
last_name: Kühne
- first_name: Christian
full_name: Plessl, Christian
id: '16153'
last_name: Plessl
orcid: 0000-0001-5728-9982
citation:
ama: 'Wu X, Kenter T, Schade R, Kühne T, Plessl C. Computing and Compressing Electron
Repulsion Integrals on FPGAs. In: 2023 IEEE 31st Annual International Symposium
on Field-Programmable Custom Computing Machines (FCCM). ; 2023:162-173. doi:10.1109/FCCM57271.2023.00026'
apa: Wu, X., Kenter, T., Schade, R., Kühne, T., & Plessl, C. (2023). Computing
and Compressing Electron Repulsion Integrals on FPGAs. 2023 IEEE 31st Annual
International Symposium on Field-Programmable Custom Computing Machines (FCCM),
162–173. https://doi.org/10.1109/FCCM57271.2023.00026
bibtex: '@inproceedings{Wu_Kenter_Schade_Kühne_Plessl_2023, title={Computing and
Compressing Electron Repulsion Integrals on FPGAs}, DOI={10.1109/FCCM57271.2023.00026},
booktitle={2023 IEEE 31st Annual International Symposium on Field-Programmable
Custom Computing Machines (FCCM)}, author={Wu, Xin and Kenter, Tobias and Schade,
Robert and Kühne, Thomas and Plessl, Christian}, year={2023}, pages={162–173}
}'
chicago: Wu, Xin, Tobias Kenter, Robert Schade, Thomas Kühne, and Christian Plessl.
“Computing and Compressing Electron Repulsion Integrals on FPGAs.” In 2023
IEEE 31st Annual International Symposium on Field-Programmable Custom Computing
Machines (FCCM), 162–73, 2023. https://doi.org/10.1109/FCCM57271.2023.00026.
ieee: 'X. Wu, T. Kenter, R. Schade, T. Kühne, and C. Plessl, “Computing and Compressing
Electron Repulsion Integrals on FPGAs,” in 2023 IEEE 31st Annual International
Symposium on Field-Programmable Custom Computing Machines (FCCM), 2023, pp.
162–173, doi: 10.1109/FCCM57271.2023.00026.'
mla: Wu, Xin, et al. “Computing and Compressing Electron Repulsion Integrals on
FPGAs.” 2023 IEEE 31st Annual International Symposium on Field-Programmable
Custom Computing Machines (FCCM), 2023, pp. 162–73, doi:10.1109/FCCM57271.2023.00026.
short: 'X. Wu, T. Kenter, R. Schade, T. Kühne, C. Plessl, in: 2023 IEEE 31st Annual
International Symposium on Field-Programmable Custom Computing Machines (FCCM),
2023, pp. 162–173.'
date_created: 2023-03-30T11:15:40Z
date_updated: 2023-08-02T15:05:42Z
department:
- _id: '27'
- _id: '518'
doi: 10.1109/FCCM57271.2023.00026
external_id:
arxiv:
- '2303.13632'
language:
- iso: eng
main_file_link:
- url: https://ieeexplore.ieee.org/document/10171537
page: 162-173
project:
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: 2023 IEEE 31st Annual International Symposium on Field-Programmable Custom
Computing Machines (FCCM)
quality_controlled: '1'
status: public
title: Computing and Compressing Electron Repulsion Integrals on FPGAs
type: conference
user_id: '75963'
year: '2023'
...
---
_id: '45361'
abstract:
- lang: eng
text: The non-orthogonal local submatrix method applied to electronic structure–based
molecular dynamics simulations is shown to exceed 1.1 EFLOP/s in FP16/FP32-mixed
floating-point arithmetic when using 4400 NVIDIA A100 GPUs of the Perlmutter system.
This is enabled by a modification of the original method that pushes the sustained
fraction of the peak performance to about 80%. Example calculations are performed
for SARS-CoV-2 spike proteins with up to 83 million atoms.
article_number: '109434202311776'
article_type: original
author:
- first_name: Robert
full_name: Schade, Robert
id: '75963'
last_name: Schade
orcid: 0000-0002-6268-539
- first_name: Tobias
full_name: Kenter, Tobias
id: '3145'
last_name: Kenter
- first_name: Hossam
full_name: Elgabarty, Hossam
id: '60250'
last_name: Elgabarty
orcid: 0000-0002-4945-1481
- first_name: Michael
full_name: Lass, Michael
id: '24135'
last_name: Lass
orcid: 0000-0002-5708-7632
- first_name: Thomas
full_name: Kühne, Thomas
id: '49079'
last_name: Kühne
- first_name: Christian
full_name: Plessl, Christian
id: '16153'
last_name: Plessl
orcid: 0000-0001-5728-9982
citation:
ama: Schade R, Kenter T, Elgabarty H, Lass M, Kühne T, Plessl C. Breaking the exascale
barrier for the electronic structure problem in ab-initio molecular dynamics.
The International Journal of High Performance Computing Applications. Published
online 2023. doi:10.1177/10943420231177631
apa: Schade, R., Kenter, T., Elgabarty, H., Lass, M., Kühne, T., & Plessl, C.
(2023). Breaking the exascale barrier for the electronic structure problem in
ab-initio molecular dynamics. The International Journal of High Performance
Computing Applications, Article 109434202311776. https://doi.org/10.1177/10943420231177631
bibtex: '@article{Schade_Kenter_Elgabarty_Lass_Kühne_Plessl_2023, title={Breaking
the exascale barrier for the electronic structure problem in ab-initio molecular
dynamics}, DOI={10.1177/10943420231177631},
number={109434202311776}, journal={The International Journal of High Performance
Computing Applications}, publisher={SAGE Publications}, author={Schade, Robert
and Kenter, Tobias and Elgabarty, Hossam and Lass, Michael and Kühne, Thomas and
Plessl, Christian}, year={2023} }'
chicago: Schade, Robert, Tobias Kenter, Hossam Elgabarty, Michael Lass, Thomas Kühne,
and Christian Plessl. “Breaking the Exascale Barrier for the Electronic Structure
Problem in Ab-Initio Molecular Dynamics.” The International Journal of High
Performance Computing Applications, 2023. https://doi.org/10.1177/10943420231177631.
ieee: 'R. Schade, T. Kenter, H. Elgabarty, M. Lass, T. Kühne, and C. Plessl, “Breaking
the exascale barrier for the electronic structure problem in ab-initio molecular
dynamics,” The International Journal of High Performance Computing Applications,
Art. no. 109434202311776, 2023, doi: 10.1177/10943420231177631.'
mla: Schade, Robert, et al. “Breaking the Exascale Barrier for the Electronic Structure
Problem in Ab-Initio Molecular Dynamics.” The International Journal of High
Performance Computing Applications, 109434202311776, SAGE Publications, 2023,
doi:10.1177/10943420231177631.
short: R. Schade, T. Kenter, H. Elgabarty, M. Lass, T. Kühne, C. Plessl, The International
Journal of High Performance Computing Applications (2023).
date_created: 2023-05-30T09:19:09Z
date_updated: 2023-08-02T15:04:53Z
department:
- _id: '27'
- _id: '518'
doi: 10.1177/10943420231177631
keyword:
- Hardware and Architecture
- Theoretical Computer Science
- Software
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://journals.sagepub.com/doi/10.1177/10943420231177631
oa: '1'
project:
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: The International Journal of High Performance Computing Applications
publication_identifier:
issn:
- 1094-3420
- 1741-2846
publication_status: published
publisher: SAGE Publications
quality_controlled: '1'
status: public
title: Breaking the exascale barrier for the electronic structure problem in ab-initio
molecular dynamics
type: journal_article
user_id: '75963'
year: '2023'
...
---
_id: '46278'
abstract:
- lang: eng
text: 'Site-controlled Ga droplets on AlGaAs substrates are fabricated using
area-selective deposition of Ga through apertures in a mask during molecular beam
epitaxy (MBE). The Ga droplets can be crystallized into GaAs quantum dots using
a crystallization step under As flux. In order to model the complex process, including
the masked deposition of the droplets and a reduction of their number during a
thermal annealing step, a multiscale kinetic Monte Carlo (mkMC) simulation of
self-assembled Ga droplet formation on AlGaAs is expanded for area-selective deposition.
The simulation has only two free model parameters: the activation energy for surface
diffusion and the activation energy for thermal escape of adatoms from a droplet.
Simulated droplet numbers within the opening of the aperture agree quantitatively
with the experimental results down to the perfect site-control, with one droplet
per aperture. However, the model parameters are different compared to those of
the self-assembled droplet growth. We attribute this to the presence of the mask
in close proximity to the surface, which modifies the local process temperature
and the As background. This approach also explains the dependence of the model
parameters on the size of the aperture.'
article_number: '466'
author:
- first_name: Stefan
full_name: Feddersen, Stefan
last_name: Feddersen
- first_name: Viktoryia
full_name: Zolatanosha, Viktoryia
last_name: Zolatanosha
- first_name: Ahmed
full_name: Alshaikh, Ahmed
last_name: Alshaikh
- first_name: Dirk
full_name: Reuter, Dirk
id: '37763'
last_name: Reuter
- first_name: Christian
full_name: Heyn, Christian
last_name: Heyn
citation:
ama: Feddersen S, Zolatanosha V, Alshaikh A, Reuter D, Heyn C. Modeling of Masked
Droplet Deposition for Site-Controlled Ga Droplets. Nanomaterials. 2023;13(3).
doi:10.3390/nano13030466
apa: Feddersen, S., Zolatanosha, V., Alshaikh, A., Reuter, D., & Heyn, C. (2023).
Modeling of Masked Droplet Deposition for Site-Controlled Ga Droplets. Nanomaterials,
13(3), Article 466. https://doi.org/10.3390/nano13030466
bibtex: '@article{Feddersen_Zolatanosha_Alshaikh_Reuter_Heyn_2023, title={Modeling
of Masked Droplet Deposition for Site-Controlled Ga Droplets}, volume={13}, DOI={10.3390/nano13030466}, number={3466},
journal={Nanomaterials}, publisher={MDPI AG}, author={Feddersen, Stefan and Zolatanosha,
Viktoryia and Alshaikh, Ahmed and Reuter, Dirk and Heyn, Christian}, year={2023}
}'
chicago: Feddersen, Stefan, Viktoryia Zolatanosha, Ahmed Alshaikh, Dirk Reuter,
and Christian Heyn. “Modeling of Masked Droplet Deposition for Site-Controlled
Ga Droplets.” Nanomaterials 13, no. 3 (2023). https://doi.org/10.3390/nano13030466.
ieee: 'S. Feddersen, V. Zolatanosha, A. Alshaikh, D. Reuter, and C. Heyn, “Modeling
of Masked Droplet Deposition for Site-Controlled Ga Droplets,” Nanomaterials,
vol. 13, no. 3, Art. no. 466, 2023, doi: 10.3390/nano13030466.'
mla: Feddersen, Stefan, et al. “Modeling of Masked Droplet Deposition for Site-Controlled
Ga Droplets.” Nanomaterials, vol. 13, no. 3, 466, MDPI AG, 2023, doi:10.3390/nano13030466.
short: S. Feddersen, V. Zolatanosha, A. Alshaikh, D. Reuter, C. Heyn, Nanomaterials
13 (2023).
date_created: 2023-08-03T11:13:28Z
date_updated: 2023-08-03T11:14:10Z
department:
- _id: '15'
- _id: '230'
doi: 10.3390/nano13030466
intvolume: ' 13'
issue: '3'
keyword:
- General Materials Science
- General Chemical Engineering
language:
- iso: eng
publication: Nanomaterials
publication_identifier:
issn:
- 2079-4991
publication_status: published
publisher: MDPI AG
status: public
title: Modeling of Masked Droplet Deposition for Site-Controlled Ga Droplets
type: journal_article
user_id: '42514'
volume: 13
year: '2023'
...
---
_id: '46485'
abstract:
- lang: eng
text: We present a miniaturized pulse shaping device that creates an arbitrary dispersion
through the interaction of multiple metasurfaces on less than 2 mm3
volume. For this, a metalens and a grating-metasurface between two silver mirrors
are fabricated. The grating contains further phase information to achieve the
device's pulse shaping functionality.
article_number: FTh4D.3
author:
- first_name: René
full_name: Geromel, René
last_name: Geromel
- first_name: Philip
full_name: Georgi, Philip
last_name: Georgi
- first_name: Maximilian
full_name: Protte, Maximilian
id: '46170'
last_name: Protte
- first_name: Tim
full_name: Bartley, Tim
id: '49683'
last_name: Bartley
- first_name: Lingling
full_name: Huang, Lingling
last_name: Huang
- first_name: Thomas
full_name: Zentgraf, Thomas
id: '30525'
last_name: Zentgraf
orcid: 0000-0002-8662-1101
citation:
ama: 'Geromel R, Georgi P, Protte M, Bartley T, Huang L, Zentgraf T. Dispersion
control with integrated plasmonic metasurfaces. In: CLEO: Fundamental Science
2023. Technical Digest Series. Optica Publishing Group; 2023. doi:10.1364/cleo_fs.2023.fth4d.3'
apa: 'Geromel, R., Georgi, P., Protte, M., Bartley, T., Huang, L., & Zentgraf,
T. (2023). Dispersion control with integrated plasmonic metasurfaces. CLEO:
Fundamental Science 2023, Article FTh4D.3. CLEO: Fundamental Science 2023,
San Jose, USA. https://doi.org/10.1364/cleo_fs.2023.fth4d.3'
bibtex: '@inproceedings{Geromel_Georgi_Protte_Bartley_Huang_Zentgraf_2023, series={Technical
Digest Series}, title={Dispersion control with integrated plasmonic metasurfaces},
DOI={10.1364/cleo_fs.2023.fth4d.3},
number={FTh4D.3}, booktitle={CLEO: Fundamental Science 2023}, publisher={Optica
Publishing Group}, author={Geromel, René and Georgi, Philip and Protte, Maximilian
and Bartley, Tim and Huang, Lingling and Zentgraf, Thomas}, year={2023}, collection={Technical
Digest Series} }'
chicago: 'Geromel, René, Philip Georgi, Maximilian Protte, Tim Bartley, Lingling
Huang, and Thomas Zentgraf. “Dispersion Control with Integrated Plasmonic Metasurfaces.”
In CLEO: Fundamental Science 2023. Technical Digest Series. Optica Publishing
Group, 2023. https://doi.org/10.1364/cleo_fs.2023.fth4d.3.'
ieee: 'R. Geromel, P. Georgi, M. Protte, T. Bartley, L. Huang, and T. Zentgraf,
“Dispersion control with integrated plasmonic metasurfaces,” presented at the
CLEO: Fundamental Science 2023, San Jose, USA, 2023, doi: 10.1364/cleo_fs.2023.fth4d.3.'
mla: 'Geromel, René, et al. “Dispersion Control with Integrated Plasmonic Metasurfaces.”
CLEO: Fundamental Science 2023, FTh4D.3, Optica Publishing Group, 2023,
doi:10.1364/cleo_fs.2023.fth4d.3.'
short: 'R. Geromel, P. Georgi, M. Protte, T. Bartley, L. Huang, T. Zentgraf, in:
CLEO: Fundamental Science 2023, Optica Publishing Group, 2023.'
conference:
end_date: 2023-05-12
location: San Jose, USA
name: 'CLEO: Fundamental Science 2023'
start_date: 2023-05-07
date_created: 2023-08-14T08:19:22Z
date_updated: 2023-08-14T08:22:31Z
department:
- _id: '15'
- _id: '230'
- _id: '289'
- _id: '623'
doi: 10.1364/cleo_fs.2023.fth4d.3
language:
- iso: eng
project:
- _id: '53'
grant_number: '231447078'
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: '170'
grant_number: '231447078'
name: 'TRR 142 - B09: TRR 142 - Effiziente Erzeugung mit maßgeschneiderter optischer
Phaselage der zweiten Harmonischen mittels Quasi-gebundener Zustände in GaAs Metaoberflächen
(B09*)'
publication: 'CLEO: Fundamental Science 2023'
publication_status: published
publisher: Optica Publishing Group
series_title: Technical Digest Series
status: public
title: Dispersion control with integrated plasmonic metasurfaces
type: conference
user_id: '30525'
year: '2023'
...
---
_id: '44851'
abstract:
- lang: eng
text: We present the fabrication of strain-free quantum dots in the In0.53Ga0.47As/In0.52Al0.48As-system
lattice matched to InP, as future sources for single and entangled photons for
long-haul fiber-based quantum communication in the optical C-band. We achieved
these quantum dots by local droplet etching via InAl droplets in an In0.52Al0.48As
layer and subsequent filling of the holes with In0.53Ga0.47As. Here, we present
detailed investigations of the hole morphologies measured by atomic force microscopy.
Statistical analysis of a set of nanoholes reveals a high degree of symmetry for
nearly half of them when etched at optimized temperatures. Overgrowth with 50–150 nm
In0.52Al0.48As increases their diameter and elongates the holes along the [01̄1]-direction.
By systematically scanning the parameter space, we were able to fill the holes
with In0.53Ga0.47As, and by capping the filled holes and performing photoluminescence
measurements, we observe photoluminescence emission in the O-band up into the
C-band depending on the filling height of the nanoholes.
author:
- first_name: D.
full_name: Deutsch, D.
last_name: Deutsch
- first_name: C.
full_name: Buchholz, C.
last_name: Buchholz
- first_name: V.
full_name: Zolatanosha, V.
last_name: Zolatanosha
- first_name: K. D.
full_name: Jöns, K. D.
last_name: Jöns
- first_name: D.
full_name: Reuter, D.
last_name: Reuter
citation:
ama: Deutsch D, Buchholz C, Zolatanosha V, Jöns KD, Reuter D. Telecom C-band photon
emission from (In,Ga)As quantum dots generated by filling nanoholes in In0.52Al0.48As
layers. AIP Advances. 2023;13(5). doi:10.1063/5.0147281
apa: Deutsch, D., Buchholz, C., Zolatanosha, V., Jöns, K. D., & Reuter, D. (2023).
Telecom C-band photon emission from (In,Ga)As quantum dots generated by filling
nanoholes in In0.52Al0.48As layers. AIP Advances, 13(5). https://doi.org/10.1063/5.0147281
bibtex: '@article{Deutsch_Buchholz_Zolatanosha_Jöns_Reuter_2023, title={Telecom
C-band photon emission from (In,Ga)As quantum dots generated by filling nanoholes
in In0.52Al0.48As layers}, volume={13}, DOI={10.1063/5.0147281},
number={5}, journal={AIP Advances}, publisher={AIP Publishing}, author={Deutsch,
D. and Buchholz, C. and Zolatanosha, V. and Jöns, K. D. and Reuter, D.}, year={2023}
}'
chicago: Deutsch, D., C. Buchholz, V. Zolatanosha, K. D. Jöns, and D. Reuter. “Telecom
C-Band Photon Emission from (In,Ga)As Quantum Dots Generated by Filling Nanoholes
in In0.52Al0.48As Layers.” AIP Advances 13, no. 5 (2023). https://doi.org/10.1063/5.0147281.
ieee: 'D. Deutsch, C. Buchholz, V. Zolatanosha, K. D. Jöns, and D. Reuter, “Telecom
C-band photon emission from (In,Ga)As quantum dots generated by filling nanoholes
in In0.52Al0.48As layers,” AIP Advances, vol. 13, no. 5, 2023, doi: 10.1063/5.0147281.'
mla: Deutsch, D., et al. “Telecom C-Band Photon Emission from (In,Ga)As Quantum
Dots Generated by Filling Nanoholes in In0.52Al0.48As Layers.” AIP Advances,
vol. 13, no. 5, AIP Publishing, 2023, doi:10.1063/5.0147281.
short: D. Deutsch, C. Buchholz, V. Zolatanosha, K.D. Jöns, D. Reuter, AIP Advances
13 (2023).
date_created: 2023-05-15T08:55:49Z
date_updated: 2023-08-14T10:05:15Z
department:
- _id: '15'
- _id: '230'
doi: 10.1063/5.0147281
intvolume: ' 13'
issue: '5'
keyword:
- General Physics and Astronomy
language:
- iso: eng
publication: AIP Advances
publication_identifier:
issn:
- 2158-3226
publication_status: published
publisher: AIP Publishing
status: public
title: Telecom C-band photon emission from (In,Ga)As quantum dots generated by filling
nanoholes in In0.52Al0.48As layers
type: journal_article
user_id: '37763'
volume: 13
year: '2023'
...
---
_id: '42459'
author:
- first_name: Moritz
full_name: Ostermann, Moritz
id: '44763'
last_name: Ostermann
orcid: https://orcid.org/0000-0003-1146-0443
- first_name: Jonathan
full_name: Behm, Jonathan
id: '50525'
last_name: Behm
- first_name: Thorsten
full_name: Marten, Thorsten
id: '338'
last_name: Marten
- first_name: Thomas
full_name: Tröster, Thomas
id: '553'
last_name: Tröster
citation:
ama: 'Ostermann M, Behm J, Marten T, Tröster T. NeMo.bil - Dekarbonisierung des
Verkehrs mithilfe von Leichtbau-Fahrzeugschwärmen. In: WerkstoffPlus Auto 13.
Fachtagung für neue Fahrzeug- und Werkstoffkonzepte. ; 2023.'
apa: Ostermann, M., Behm, J., Marten, T., & Tröster, T. (2023). NeMo.bil - Dekarbonisierung
des Verkehrs mithilfe von Leichtbau-Fahrzeugschwärmen. WerkstoffPlus Auto 13.
Fachtagung für neue Fahrzeug- und Werkstoffkonzepte. WerkstoffPlus Auto 13.
Fachtagung für neue Fahrzeug- und Werkstoffkonzepte, Stuttgart.
bibtex: '@inproceedings{Ostermann_Behm_Marten_Tröster_2023, place={Stuttgart, Germany},
title={NeMo.bil - Dekarbonisierung des Verkehrs mithilfe von Leichtbau-Fahrzeugschwärmen},
booktitle={WerkstoffPlus Auto 13. Fachtagung für neue Fahrzeug- und Werkstoffkonzepte},
author={Ostermann, Moritz and Behm, Jonathan and Marten, Thorsten and Tröster,
Thomas}, year={2023} }'
chicago: Ostermann, Moritz, Jonathan Behm, Thorsten Marten, and Thomas Tröster.
“NeMo.bil - Dekarbonisierung des Verkehrs mithilfe von Leichtbau-Fahrzeugschwärmen.”
In WerkstoffPlus Auto 13. Fachtagung für neue Fahrzeug- und Werkstoffkonzepte.
Stuttgart, Germany, 2023.
ieee: M. Ostermann, J. Behm, T. Marten, and T. Tröster, “NeMo.bil - Dekarbonisierung
des Verkehrs mithilfe von Leichtbau-Fahrzeugschwärmen,” presented at the WerkstoffPlus
Auto 13. Fachtagung für neue Fahrzeug- und Werkstoffkonzepte, Stuttgart, 2023.
mla: Ostermann, Moritz, et al. “NeMo.bil - Dekarbonisierung des Verkehrs mithilfe
von Leichtbau-Fahrzeugschwärmen.” WerkstoffPlus Auto 13. Fachtagung für neue
Fahrzeug- und Werkstoffkonzepte, 2023.
short: 'M. Ostermann, J. Behm, T. Marten, T. Tröster, in: WerkstoffPlus Auto 13.
Fachtagung für neue Fahrzeug- und Werkstoffkonzepte, Stuttgart, Germany, 2023.'
conference:
end_date: 2023-02-16
location: Stuttgart
name: WerkstoffPlus Auto 13. Fachtagung für neue Fahrzeug- und Werkstoffkonzepte
start_date: 2023-02-15
date_created: 2023-02-24T09:11:28Z
date_updated: 2023-08-21T18:47:27Z
department:
- _id: '9'
- _id: '321'
- _id: '149'
language:
- iso: ger
place: Stuttgart, Germany
publication: WerkstoffPlus Auto 13. Fachtagung für neue Fahrzeug- und Werkstoffkonzepte
status: public
title: NeMo.bil - Dekarbonisierung des Verkehrs mithilfe von Leichtbau-Fahrzeugschwärmen
type: conference_abstract
user_id: '44763'
year: '2023'
...
---
_id: '46741'
author:
- first_name: Mario Fabian
full_name: Zscherp, Mario Fabian
last_name: Zscherp
- first_name: Silas Aurel
full_name: Jentsch, Silas Aurel
last_name: Jentsch
- first_name: Marius Johannes
full_name: Müller, Marius Johannes
last_name: Müller
- first_name: Vitalii
full_name: Lider, Vitalii
last_name: Lider
- first_name: Celina
full_name: Becker, Celina
last_name: Becker
- first_name: Limei
full_name: Chen, Limei
last_name: Chen
- first_name: Mario
full_name: Littmann, Mario
last_name: Littmann
- first_name: Falco
full_name: Meier, Falco
last_name: Meier
- first_name: Andreas
full_name: Beyer, Andreas
last_name: Beyer
- first_name: Detlev Michael
full_name: Hofmann, Detlev Michael
last_name: Hofmann
- first_name: Donat Josef
full_name: As, Donat Josef
id: '14'
last_name: As
orcid: 0000-0003-1121-3565
- first_name: Peter Jens
full_name: Klar, Peter Jens
last_name: Klar
- first_name: Kerstin
full_name: Volz, Kerstin
last_name: Volz
- first_name: Sangam
full_name: Chatterjee, Sangam
last_name: Chatterjee
- first_name: Jörg
full_name: Schörmann, Jörg
last_name: Schörmann
citation:
ama: Zscherp MF, Jentsch SA, Müller MJ, et al. Overcoming the Miscibility Gap of
GaN/InN in MBE Growth of Cubic InxGa1–xN.
ACS Applied Materials & Interfaces. 2023;15(33):39513-39522. doi:10.1021/acsami.3c06319
apa: Zscherp, M. F., Jentsch, S. A., Müller, M. J., Lider, V., Becker, C., Chen,
L., Littmann, M., Meier, F., Beyer, A., Hofmann, D. M., As, D. J., Klar, P. J.,
Volz, K., Chatterjee, S., & Schörmann, J. (2023). Overcoming the Miscibility
Gap of GaN/InN in MBE Growth of Cubic InxGa1–xN.
ACS Applied Materials & Interfaces, 15(33), 39513–39522.
https://doi.org/10.1021/acsami.3c06319
bibtex: '@article{Zscherp_Jentsch_Müller_Lider_Becker_Chen_Littmann_Meier_Beyer_Hofmann_et
al._2023, title={Overcoming the Miscibility Gap of GaN/InN in MBE Growth of Cubic
InxGa1–xN}, volume={15}, DOI={10.1021/acsami.3c06319},
number={33}, journal={ACS Applied Materials & Interfaces}, publisher={American
Chemical Society (ACS)}, author={Zscherp, Mario Fabian and Jentsch, Silas Aurel
and Müller, Marius Johannes and Lider, Vitalii and Becker, Celina and Chen, Limei
and Littmann, Mario and Meier, Falco and Beyer, Andreas and Hofmann, Detlev Michael
and et al.}, year={2023}, pages={39513–39522} }'
chicago: 'Zscherp, Mario Fabian, Silas Aurel Jentsch, Marius Johannes Müller, Vitalii
Lider, Celina Becker, Limei Chen, Mario Littmann, et al. “Overcoming the Miscibility
Gap of GaN/InN in MBE Growth of Cubic InxGa1–xN.”
ACS Applied Materials & Interfaces 15, no. 33 (2023): 39513–22.
https://doi.org/10.1021/acsami.3c06319.'
ieee: 'M. F. Zscherp et al., “Overcoming the Miscibility Gap of GaN/InN in
MBE Growth of Cubic InxGa1–xN,” ACS Applied
Materials & Interfaces, vol. 15, no. 33, pp. 39513–39522, 2023, doi:
10.1021/acsami.3c06319.'
mla: Zscherp, Mario Fabian, et al. “Overcoming the Miscibility Gap of GaN/InN in
MBE Growth of Cubic InxGa1–xN.” ACS Applied
Materials & Interfaces, vol. 15, no. 33, American Chemical Society
(ACS), 2023, pp. 39513–22, doi:10.1021/acsami.3c06319.
short: M.F. Zscherp, S.A. Jentsch, M.J. Müller, V. Lider, C. Becker, L. Chen, M.
Littmann, F. Meier, A. Beyer, D.M. Hofmann, D.J. As, P.J. Klar, K. Volz, S. Chatterjee,
J. Schörmann, ACS Applied Materials & Interfaces 15 (2023) 39513–39522.
date_created: 2023-08-28T06:45:20Z
date_updated: 2023-08-28T06:46:23Z
department:
- _id: '15'
- _id: '230'
doi: 10.1021/acsami.3c06319
intvolume: ' 15'
issue: '33'
keyword:
- General Materials Science
language:
- iso: eng
page: 39513-39522
publication: ACS Applied Materials & Interfaces
publication_identifier:
issn:
- 1944-8244
- 1944-8252
publication_status: published
publisher: American Chemical Society (ACS)
status: public
title: Overcoming the Miscibility Gap of GaN/InN in MBE Growth of Cubic InxGa1–xN
type: journal_article
user_id: '42514'
volume: 15
year: '2023'
...
---
_id: '46762'
author:
- first_name: Arnold
full_name: Tchomgue Simeu, Arnold
id: '83075'
last_name: Tchomgue Simeu
- first_name: Rolf
full_name: Mahnken, Rolf
id: '335'
last_name: Mahnken
citation:
ama: 'Tchomgue Simeu A, Mahnken R. Mesh- and model adaptivity for elasto-plastic
mean-field and full-field homogenization based on downwind and upwind approximations.
In: XI International Conference on Adaptive Modeling and Simulation. CIMNE;
2023. doi:10.23967/admos.2023.054'
apa: Tchomgue Simeu, A., & Mahnken, R. (2023). Mesh- and model adaptivity for
elasto-plastic mean-field and full-field homogenization based on downwind and
upwind approximations. XI International Conference on Adaptive Modeling and
Simulation. https://doi.org/10.23967/admos.2023.054
bibtex: '@inproceedings{Tchomgue Simeu_Mahnken_2023, title={Mesh- and model adaptivity
for elasto-plastic mean-field and full-field homogenization based on downwind
and upwind approximations}, DOI={10.23967/admos.2023.054},
booktitle={XI International Conference on Adaptive Modeling and Simulation}, publisher={CIMNE},
author={Tchomgue Simeu, Arnold and Mahnken, Rolf}, year={2023} }'
chicago: Tchomgue Simeu, Arnold, and Rolf Mahnken. “Mesh- and Model Adaptivity for
Elasto-Plastic Mean-Field and Full-Field Homogenization Based on Downwind and
Upwind Approximations.” In XI International Conference on Adaptive Modeling
and Simulation. CIMNE, 2023. https://doi.org/10.23967/admos.2023.054.
ieee: 'A. Tchomgue Simeu and R. Mahnken, “Mesh- and model adaptivity for elasto-plastic
mean-field and full-field homogenization based on downwind and upwind approximations,”
2023, doi: 10.23967/admos.2023.054.'
mla: Tchomgue Simeu, Arnold, and Rolf Mahnken. “Mesh- and Model Adaptivity for Elasto-Plastic
Mean-Field and Full-Field Homogenization Based on Downwind and Upwind Approximations.”
XI International Conference on Adaptive Modeling and Simulation, CIMNE,
2023, doi:10.23967/admos.2023.054.
short: 'A. Tchomgue Simeu, R. Mahnken, in: XI International Conference on Adaptive
Modeling and Simulation, CIMNE, 2023.'
date_created: 2023-09-01T07:52:20Z
date_updated: 2023-09-01T07:54:31Z
department:
- _id: '9'
- _id: '154'
- _id: '321'
doi: 10.23967/admos.2023.054
language:
- iso: eng
publication: XI International Conference on Adaptive Modeling and Simulation
publication_status: published
publisher: CIMNE
quality_controlled: '1'
status: public
title: Mesh- and model adaptivity for elasto-plastic mean-field and full-field homogenization
based on downwind and upwind approximations
type: conference
user_id: '335'
year: '2023'
...
---
_id: '46815'
abstract:
- lang: eng
text: In this work, the influence of the filler–matrix adhesion on the tensile properties
of laser-sintered parts built with Polyamide 613 filled with glass beads was investigated.
For this purpose, dry blends of glass beads with and without organosilane coupling
agents and polyamide powder were prepared and processed into tensile specimens
on an EOS P396 laser sintering system. The samples were tested both in the dry
state and after an accelerated conditioning in a climate chamber. Furthermore,
finite element method (FEM) simulations were performed to model the extreme cases
of optimum adhesion and no adhesion. By correlating the tensile tests with the
simulation results and by analyzing the fracture surfaces, it was shown that the
filler–matrix adhesion is sufficient in the dry state but is strongly degraded
by conditioning. Even the presence of various organosilane thin films could not
prevent a strong deterioration of the filler–matrix adhesion and the associated
deterioration of the mechanical properties. Since a comparison with an injection-molded
sample of the same polymer filler combination shows identical behavior after conditioning,
it is assumed that this problem is not limited to additively manufactured parts.
author:
- first_name: Ivo
full_name: Kletetzka, Ivo
id: '50769'
last_name: Kletetzka
- first_name: Maren
full_name: Kosanke, Maren
last_name: Kosanke
- first_name: Dennis
full_name: Meinderink, Dennis
last_name: Meinderink
- first_name: Vanessa
full_name: Neßlinger, Vanessa
last_name: Neßlinger
- first_name: Guido
full_name: Grundmeier, Guido
id: '194'
last_name: Grundmeier
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
orcid: 000-0001-8590-1921
citation:
ama: Kletetzka I, Kosanke M, Meinderink D, Neßlinger V, Grundmeier G, Schmid H-J.
Influence of the filler–matrix adhesion and the effects of conditioning on tensile
properties of laser-sintered parts built with polyamide–glass bead dry blends.
Progress in Additive Manufacturing. Published online 2023. doi:10.1007/s40964-023-00501-z
apa: Kletetzka, I., Kosanke, M., Meinderink, D., Neßlinger, V., Grundmeier, G.,
& Schmid, H.-J. (2023). Influence of the filler–matrix adhesion and the effects
of conditioning on tensile properties of laser-sintered parts built with polyamide–glass
bead dry blends. Progress in Additive Manufacturing. https://doi.org/10.1007/s40964-023-00501-z
bibtex: '@article{Kletetzka_Kosanke_Meinderink_Neßlinger_Grundmeier_Schmid_2023,
title={Influence of the filler–matrix adhesion and the effects of conditioning
on tensile properties of laser-sintered parts built with polyamide–glass bead
dry blends}, DOI={10.1007/s40964-023-00501-z},
journal={Progress in Additive Manufacturing}, publisher={Springer Science and
Business Media LLC}, author={Kletetzka, Ivo and Kosanke, Maren and Meinderink,
Dennis and Neßlinger, Vanessa and Grundmeier, Guido and Schmid, Hans-Joachim},
year={2023} }'
chicago: Kletetzka, Ivo, Maren Kosanke, Dennis Meinderink, Vanessa Neßlinger, Guido
Grundmeier, and Hans-Joachim Schmid. “Influence of the Filler–Matrix Adhesion
and the Effects of Conditioning on Tensile Properties of Laser-Sintered Parts
Built with Polyamide–Glass Bead Dry Blends.” Progress in Additive Manufacturing,
2023. https://doi.org/10.1007/s40964-023-00501-z.
ieee: 'I. Kletetzka, M. Kosanke, D. Meinderink, V. Neßlinger, G. Grundmeier, and
H.-J. Schmid, “Influence of the filler–matrix adhesion and the effects of conditioning
on tensile properties of laser-sintered parts built with polyamide–glass bead
dry blends,” Progress in Additive Manufacturing, 2023, doi: 10.1007/s40964-023-00501-z.'
mla: Kletetzka, Ivo, et al. “Influence of the Filler–Matrix Adhesion and the Effects
of Conditioning on Tensile Properties of Laser-Sintered Parts Built with Polyamide–Glass
Bead Dry Blends.” Progress in Additive Manufacturing, Springer Science
and Business Media LLC, 2023, doi:10.1007/s40964-023-00501-z.
short: I. Kletetzka, M. Kosanke, D. Meinderink, V. Neßlinger, G. Grundmeier, H.-J.
Schmid, Progress in Additive Manufacturing (2023).
date_created: 2023-09-06T06:49:38Z
date_updated: 2023-09-07T11:51:01Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
- _id: '9'
doi: 10.1007/s40964-023-00501-z
keyword:
- Industrial and Manufacturing Engineering
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://rdcu.be/dlqzG
oa: '1'
publication: Progress in Additive Manufacturing
publication_identifier:
issn:
- 2363-9512
- 2363-9520
publication_status: published
publisher: Springer Science and Business Media LLC
quality_controlled: '1'
status: public
title: Influence of the filler–matrix adhesion and the effects of conditioning on
tensile properties of laser-sintered parts built with polyamide–glass bead dry blends
type: journal_article
user_id: '50769'
year: '2023'
...
---
_id: '43049'
abstract:
- lang: eng
text: "Abstract\r\n In this work, the influence
of the filler matrix adhesion on the tensile properties of laser-sintered parts
built with Polyamide 613 filled with glass beads was investigated. For this purpose,
dry blends of glass beads with and without organosilane coupling agents and polyamide
powder were prepared and processed into tensile specimens on an EOS P396. The
samples were tested both in the dry state and after an accelerated conditioning
in a climate chamber. Furthermore, FEM simulations were performed to model the
limiting cases of optimum adhesion and no adhesion. By correlating the tensile
tests with the simulation results and by analyzing the fracture surfaces, it was
shown that the filler matrix adhesion is sufficient in the dry state but is strongly
degraded by conditioning. Even the presence of various organosilane thin films
could not prevent a strong deterioration of the filler-matrix adhesion and the
associated deterioration of the mechanical properties. Since a comparison with
an injection molded sample of the same polymer filler combination shows identical
behavior after conditioning, it is assumed that this problem is not limited to
additively manufactured parts."
author:
- first_name: Ivo
full_name: Kletetzka, Ivo
last_name: Kletetzka
- first_name: Maren
full_name: Kosanke, Maren
last_name: Kosanke
- first_name: Dennis
full_name: Meinderink, Dennis
last_name: Meinderink
- first_name: Vanessa
full_name: Neßlinger, Vanessa
last_name: Neßlinger
- first_name: Guido
full_name: Grundmeier, Guido
last_name: Grundmeier
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
last_name: Schmid
citation:
ama: Kletetzka I, Kosanke M, Meinderink D, Neßlinger V, Grundmeier G, Schmid H-J.
Influence of the filler matrix adhesion and the effects of conditioning on tensile
properties of laser sintered parts built with polyamide glass bead dry blends.
Published online 2023.
apa: Kletetzka, I., Kosanke, M., Meinderink, D., Neßlinger, V., Grundmeier, G.,
& Schmid, H.-J. (2023). Influence of the filler matrix adhesion and the
effects of conditioning on tensile properties of laser sintered parts built with
polyamide glass bead dry blends. Research Square Platform LLC.
bibtex: '@article{Kletetzka_Kosanke_Meinderink_Neßlinger_Grundmeier_Schmid_2023,
title={Influence of the filler matrix adhesion and the effects of conditioning
on tensile properties of laser sintered parts built with polyamide glass bead
dry blends}, publisher={Research Square Platform LLC}, author={Kletetzka, Ivo
and Kosanke, Maren and Meinderink, Dennis and Neßlinger, Vanessa and Grundmeier,
Guido and Schmid, Hans-Joachim}, year={2023} }'
chicago: Kletetzka, Ivo, Maren Kosanke, Dennis Meinderink, Vanessa Neßlinger, Guido
Grundmeier, and Hans-Joachim Schmid. “Influence of the Filler Matrix Adhesion
and the Effects of Conditioning on Tensile Properties of Laser Sintered Parts
Built with Polyamide Glass Bead Dry Blends.” Research Square Platform LLC, 2023.
ieee: I. Kletetzka, M. Kosanke, D. Meinderink, V. Neßlinger, G. Grundmeier, and
H.-J. Schmid, “Influence of the filler matrix adhesion and the effects of conditioning
on tensile properties of laser sintered parts built with polyamide glass bead
dry blends.” Research Square Platform LLC, 2023.
mla: Kletetzka, Ivo, et al. Influence of the Filler Matrix Adhesion and the Effects
of Conditioning on Tensile Properties of Laser Sintered Parts Built with Polyamide
Glass Bead Dry Blends. Research Square Platform LLC, 2023.
short: I. Kletetzka, M. Kosanke, D. Meinderink, V. Neßlinger, G. Grundmeier, H.-J.
Schmid, (2023).
date_created: 2023-03-20T09:13:23Z
date_updated: 2023-09-07T11:52:39Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
- _id: '9'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.researchsquare.com/article/rs-2664324/v1
oa: '1'
publication_status: published
publisher: Research Square Platform LLC
status: public
title: Influence of the filler matrix adhesion and the effects of conditioning on
tensile properties of laser sintered parts built with polyamide glass bead dry blends
type: preprint
user_id: '50769'
year: '2023'
...
---
_id: '45783'
author:
- first_name: Ivo
full_name: Kletetzka, Ivo
id: '50769'
last_name: Kletetzka
citation:
ama: 'Kletetzka I. Tensile Testing for Polymer AM - Best Pratice at the DMRC. In:
; 2023.'
apa: Kletetzka, I. (2023). Tensile Testing for Polymer AM - Best Pratice at the
DMRC. Mobility goes Additve, Berlin.
bibtex: '@inproceedings{Kletetzka_2023, title={Tensile Testing for Polymer AM -
Best Pratice at the DMRC}, author={Kletetzka, Ivo}, year={2023} }'
chicago: Kletetzka, Ivo. “Tensile Testing for Polymer AM - Best Pratice at the DMRC,”
2023.
ieee: I. Kletetzka, “Tensile Testing for Polymer AM - Best Pratice at the DMRC,”
presented at the Mobility goes Additve, Berlin, 2023.
mla: Kletetzka, Ivo. Tensile Testing for Polymer AM - Best Pratice at the DMRC.
2023.
short: 'I. Kletetzka, in: 2023.'
conference:
end_date: 2023-05-31
location: Berlin
name: Mobility goes Additve
start_date: 2023-05-31
date_created: 2023-06-27T08:32:16Z
date_updated: 2023-09-07T11:52:08Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
- _id: '9'
language:
- iso: eng
publication_status: published
status: public
title: Tensile Testing for Polymer AM - Best Pratice at the DMRC
type: conference_abstract
user_id: '50769'
year: '2023'
...
---
_id: '43046'
abstract:
- lang: eng
text: In the laser sintering technology, the semi-crystalline polymer material is
exposed to elevated temperatures during processing, which leads to serious material
ageing for most materials. This has already been investigated intensively by various
authors. However, the ageing of the material at ambient temperatures during shelf
life has not been the focus so far. The need to analyse the shelf life can be
derived from an ecological and economic point of view. This work is focusing on
the shelf life of PA2200 (PA12). To reduce the potential influences of powder
production fluctuations, two different powder batches stored for 5.5 years and
6.5 years are investigated and compared to a reference powder produced 0.5 years
before these investigations. Multiple powder analyses and part characterisations
have been performed. A significant yellowing and molecular chain length reduction
can be derived from the measurement results. Whereas the influence on mechanical
part performance was minor, the parts built with the stored powders are more yellowish.
As it is most likely that this is due to the consumption of polyamide stabilisers,
it can be assumed that these parts will be subject to significantly faster ageing.
Therefore, it is still not recommended to use the stored powders for critical
parts or light intense and humid environments.
author:
- first_name: Sven Helge
full_name: Klippstein, Sven Helge
id: '71545'
last_name: Klippstein
- first_name: Ivo
full_name: Kletetzka, Ivo
id: '50769'
last_name: Kletetzka
- first_name: Ilknur
full_name: Sural, Ilknur
last_name: Sural
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
orcid: 000-0001-8590-1921
citation:
ama: Klippstein SH, Kletetzka I, Sural I, Schmid H-J. Influence of a prolonged shelf
time on PA12 laser sintering powder and resulting part properties. The International
Journal of Advanced Manufacturing Technology . Published online 2023. doi:https://doi.org/10.1007/s00170-023-11243-1
apa: Klippstein, S. H., Kletetzka, I., Sural, I., & Schmid, H.-J. (2023). Influence
of a prolonged shelf time on PA12 laser sintering powder and resulting part properties.
The International Journal of Advanced Manufacturing Technology . https://doi.org/10.1007/s00170-023-11243-1
bibtex: '@article{Klippstein_Kletetzka_Sural_Schmid_2023, title={Influence of a
prolonged shelf time on PA12 laser sintering powder and resulting part properties},
DOI={https://doi.org/10.1007/s00170-023-11243-1},
journal={The International Journal of Advanced Manufacturing Technology }, publisher={Springer},
author={Klippstein, Sven Helge and Kletetzka, Ivo and Sural, Ilknur and Schmid,
Hans-Joachim}, year={2023} }'
chicago: Klippstein, Sven Helge, Ivo Kletetzka, Ilknur Sural, and Hans-Joachim Schmid.
“Influence of a Prolonged Shelf Time on PA12 Laser Sintering Powder and Resulting
Part Properties.” The International Journal of Advanced Manufacturing Technology
, 2023. https://doi.org/10.1007/s00170-023-11243-1.
ieee: 'S. H. Klippstein, I. Kletetzka, I. Sural, and H.-J. Schmid, “Influence of
a prolonged shelf time on PA12 laser sintering powder and resulting part properties,”
The International Journal of Advanced Manufacturing Technology , 2023,
doi: https://doi.org/10.1007/s00170-023-11243-1.'
mla: Klippstein, Sven Helge, et al. “Influence of a Prolonged Shelf Time on PA12
Laser Sintering Powder and Resulting Part Properties.” The International Journal
of Advanced Manufacturing Technology , Springer, 2023, doi:https://doi.org/10.1007/s00170-023-11243-1.
short: S.H. Klippstein, I. Kletetzka, I. Sural, H.-J. Schmid, The International
Journal of Advanced Manufacturing Technology (2023).
date_created: 2023-03-18T14:28:46Z
date_updated: 2023-09-07T11:57:59Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
- _id: '9'
doi: https://doi.org/10.1007/s00170-023-11243-1
keyword:
- Selective laser sintering
- Shelf life
- Polyamide 12
- powder
- PA2200
- material ageing
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://link.springer.com/article/10.1007/s00170-023-11243-1
oa: '1'
publication: 'The International Journal of Advanced Manufacturing Technology '
publication_status: published
publisher: Springer
quality_controlled: '1'
status: public
title: Influence of a prolonged shelf time on PA12 laser sintering powder and resulting
part properties
type: journal_article
user_id: '50769'
year: '2023'
...
---
_id: '46861'
author:
- first_name: Said
full_name: Sajadi, Said
last_name: Sajadi
citation:
ama: Sajadi S. Charakterisierung und Bewertung von flammgeschützten PA12 Pulvermischungen
hinsichtlich der Verarbeitbarkeit im Lasersinter-Prozess.; 2023.
apa: Sajadi, S. (2023). Charakterisierung und Bewertung von flammgeschützten
PA12 Pulvermischungen hinsichtlich der Verarbeitbarkeit im Lasersinter-Prozess.
bibtex: '@book{Sajadi_2023, title={Charakterisierung und Bewertung von flammgeschützten
PA12 Pulvermischungen hinsichtlich der Verarbeitbarkeit im Lasersinter-Prozess},
author={Sajadi, Said}, year={2023} }'
chicago: Sajadi, Said. Charakterisierung und Bewertung von flammgeschützten PA12
Pulvermischungen hinsichtlich der Verarbeitbarkeit im Lasersinter-Prozess,
2023.
ieee: S. Sajadi, Charakterisierung und Bewertung von flammgeschützten PA12 Pulvermischungen
hinsichtlich der Verarbeitbarkeit im Lasersinter-Prozess. 2023.
mla: Sajadi, Said. Charakterisierung und Bewertung von flammgeschützten PA12
Pulvermischungen hinsichtlich der Verarbeitbarkeit im Lasersinter-Prozess.
2023.
short: S. Sajadi, Charakterisierung und Bewertung von flammgeschützten PA12 Pulvermischungen
hinsichtlich der Verarbeitbarkeit im Lasersinter-Prozess, 2023.
date_created: 2023-09-07T11:57:48Z
date_updated: 2023-09-07T12:02:38Z
department:
- _id: '150'
- _id: '219'
- _id: '624'
- _id: '9'
language:
- iso: ger
status: public
supervisor:
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
orcid: 000-0001-8590-1921
- first_name: Steffen
full_name: Jesinghausen, Steffen
id: '3959'
last_name: Jesinghausen
orcid: https://orcid.org/0000-0003-2611-5298
- first_name: Fabian
full_name: Neitzel, Fabian
id: '72307'
last_name: Neitzel
orcid: '0009-0004-8412-3645 '
title: Charakterisierung und Bewertung von flammgeschützten PA12 Pulvermischungen
hinsichtlich der Verarbeitbarkeit im Lasersinter-Prozess
type: bachelorsthesis
user_id: '72307'
year: '2023'
...