---
_id: '18557'
abstract:
- lang: eng
text: We describe the software package SPEX, which allows first-principles calculations
of quasiparticle and collective electronic excitations in solids using techniques
from many-body perturbation theory. The implementation is based on the full-potential
linearized augmented-plane-wave (FLAPW) method, which treats core and valence
electrons on an equal footing and can be applied to a wide range of materials,
including transition metals and rare earths. After a discussion of essential features
that contribute to the high numerical efficiency of the code, we present illustrative
results for quasiparticle band structures calculated within the GW approximation
for the electronic self-energy, electron-energy-loss spectra with inter- and intraband
transitions as well as local-field effects, and spin-wave spectra of itinerant
ferromagnets. In all cases the inclusion of many-body correlation terms leads
to very good quantitative agreement with experimental spectroscopies.
article_type: original
author:
- first_name: Arno
full_name: Schindlmayr, Arno
id: '458'
last_name: Schindlmayr
orcid: 0000-0002-4855-071X
- first_name: Christoph
full_name: Friedrich, Christoph
last_name: Friedrich
- first_name: Ersoy
full_name: Şaşıoğlu, Ersoy
last_name: Şaşıoğlu
- first_name: Stefan
full_name: Blügel, Stefan
last_name: Blügel
citation:
ama: Schindlmayr A, Friedrich C, Şaşıoğlu E, Blügel S. First-principles calculation
of electronic excitations in solids with SPEX. Zeitschrift für Physikalische
Chemie. 2010;224(3-4):357-368. doi:10.1524/zpch.2010.6110
apa: Schindlmayr, A., Friedrich, C., Şaşıoğlu, E., & Blügel, S. (2010). First-principles
calculation of electronic excitations in solids with SPEX. Zeitschrift Für
Physikalische Chemie, 224(3–4), 357–368. https://doi.org/10.1524/zpch.2010.6110
bibtex: '@article{Schindlmayr_Friedrich_Şaşıoğlu_Blügel_2010, title={First-principles
calculation of electronic excitations in solids with SPEX}, volume={224}, DOI={10.1524/zpch.2010.6110}, number={3–4},
journal={Zeitschrift für Physikalische Chemie}, publisher={Oldenbourg}, author={Schindlmayr,
Arno and Friedrich, Christoph and Şaşıoğlu, Ersoy and Blügel, Stefan}, year={2010},
pages={357–368} }'
chicago: 'Schindlmayr, Arno, Christoph Friedrich, Ersoy Şaşıoğlu, and Stefan Blügel.
“First-Principles Calculation of Electronic Excitations in Solids with SPEX.”
Zeitschrift Für Physikalische Chemie 224, no. 3–4 (2010): 357–68. https://doi.org/10.1524/zpch.2010.6110.'
ieee: 'A. Schindlmayr, C. Friedrich, E. Şaşıoğlu, and S. Blügel, “First-principles
calculation of electronic excitations in solids with SPEX,” Zeitschrift für
Physikalische Chemie, vol. 224, no. 3–4, pp. 357–368, 2010, doi: 10.1524/zpch.2010.6110.'
mla: Schindlmayr, Arno, et al. “First-Principles Calculation of Electronic Excitations
in Solids with SPEX.” Zeitschrift Für Physikalische Chemie, vol. 224, no.
3–4, Oldenbourg, 2010, pp. 357–68, doi:10.1524/zpch.2010.6110.
short: A. Schindlmayr, C. Friedrich, E. Şaşıoğlu, S. Blügel, Zeitschrift Für Physikalische
Chemie 224 (2010) 357–368.
date_created: 2020-08-28T11:20:50Z
date_updated: 2025-12-16T11:09:01Z
ddc:
- '530'
department:
- _id: '296'
- _id: '35'
- _id: '15'
- _id: '170'
- _id: '230'
doi: 10.1524/zpch.2010.6110
external_id:
arxiv:
- '1110.1596'
isi:
- '000281124800006'
file:
- access_level: closed
content_type: application/pdf
creator: schindlm
date_created: 2020-08-28T14:34:10Z
date_updated: 2020-08-30T15:04:39Z
description: © 2010 Oldenbourg Wissenschaftsverlag, München
file_id: '18581'
file_name: zpch.2010.6110.pdf
file_size: 912086
relation: main_file
title: First-principles calculation of electronic excitations in solids with SPEX
file_date_updated: 2020-08-30T15:04:39Z
has_accepted_license: '1'
intvolume: ' 224'
isi: '1'
issue: 3-4
language:
- iso: eng
page: 357-368
publication: Zeitschrift für Physikalische Chemie
publication_identifier:
eissn:
- 2196-7156
issn:
- 0942-9352
publication_status: published
publisher: Oldenbourg
quality_controlled: '1'
status: public
title: First-principles calculation of electronic excitations in solids with SPEX
type: journal_article
user_id: '16199'
volume: 224
year: '2010'
...
---
_id: '4177'
abstract:
- lang: eng
text: "Excitonic spectra of weakly disordered semiconductor heterostructures are
simulated on the basis of a\r\none-dimensional tight-binding model. The influence
of the length scale of weak disorder in quantum wells on\r\nthe redshift of the
excitonic peak and its linewidth is studied. By calculating two-dimensional Fouriertransform\r\nspectra
we are able to determine the contribution of disorder to inhomogeneous and also
to homogeneous\r\nbroadenings separately. This disorder-induced dephasing is related
to a Fano-type coupling and leads\r\nto contributions to the homogeneous linewidth
that depends on energy within the inhomogeneously broadened\r\nline. The model
includes heavy- and light-hole excitons and yields smaller inhomogeneous broadening
for the\r\nlight-hole exciton if compared to the heavy-hole exciton, which agrees
qualitatively with the experiment."
article_number: '075307'
article_type: original
author:
- first_name: I.
full_name: Kuznetsova, I.
last_name: Kuznetsova
- first_name: N.
full_name: Gőgh, N.
last_name: Gőgh
- first_name: Jens
full_name: Förstner, Jens
id: '158'
last_name: Förstner
orcid: 0000-0001-7059-9862
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
- first_name: S. T.
full_name: Cundiff, S. T.
last_name: Cundiff
- first_name: I.
full_name: Varga, I.
last_name: Varga
- first_name: P.
full_name: Thomas, P.
last_name: Thomas
citation:
ama: Kuznetsova I, Gőgh N, Förstner J, et al. Modeling excitonic line shapes in
weakly disordered semiconductor nanostructures. Physical Review B. 2010;81(7).
doi:10.1103/physrevb.81.075307
apa: Kuznetsova, I., Gőgh, N., Förstner, J., Meier, T., Cundiff, S. T., Varga, I.,
& Thomas, P. (2010). Modeling excitonic line shapes in weakly disordered semiconductor
nanostructures. Physical Review B, 81(7), Article 075307. https://doi.org/10.1103/physrevb.81.075307
bibtex: '@article{Kuznetsova_Gőgh_Förstner_Meier_Cundiff_Varga_Thomas_2010, title={Modeling
excitonic line shapes in weakly disordered semiconductor nanostructures}, volume={81},
DOI={10.1103/physrevb.81.075307},
number={7075307}, journal={Physical Review B}, publisher={American Physical Society
(APS)}, author={Kuznetsova, I. and Gőgh, N. and Förstner, Jens and Meier, Torsten
and Cundiff, S. T. and Varga, I. and Thomas, P.}, year={2010} }'
chicago: Kuznetsova, I., N. Gőgh, Jens Förstner, Torsten Meier, S. T. Cundiff, I.
Varga, and P. Thomas. “Modeling Excitonic Line Shapes in Weakly Disordered Semiconductor
Nanostructures.” Physical Review B 81, no. 7 (2010). https://doi.org/10.1103/physrevb.81.075307.
ieee: 'I. Kuznetsova et al., “Modeling excitonic line shapes in weakly disordered
semiconductor nanostructures,” Physical Review B, vol. 81, no. 7, Art.
no. 075307, 2010, doi: 10.1103/physrevb.81.075307.'
mla: Kuznetsova, I., et al. “Modeling Excitonic Line Shapes in Weakly Disordered
Semiconductor Nanostructures.” Physical Review B, vol. 81, no. 7, 075307,
American Physical Society (APS), 2010, doi:10.1103/physrevb.81.075307.
short: I. Kuznetsova, N. Gőgh, J. Förstner, T. Meier, S.T. Cundiff, I. Varga, P.
Thomas, Physical Review B 81 (2010).
date_created: 2018-08-28T09:09:37Z
date_updated: 2025-12-16T11:24:45Z
ddc:
- '530'
department:
- _id: '15'
- _id: '293'
- _id: '170'
- _id: '230'
- _id: '35'
- _id: '34'
- _id: '61'
doi: 10.1103/physrevb.81.075307
file:
- access_level: closed
content_type: application/pdf
creator: hclaudia
date_created: 2018-08-28T09:13:01Z
date_updated: 2018-08-28T09:13:01Z
file_id: '4178'
file_name: 2010 Kuznetsova,Gögh,Förstner,Meier T,Cundiff, Varga,Thomas_Modeling
excitonic line shapes in weakly disordered semiconductor nanostructures.pdf
file_size: 713758
relation: main_file
success: 1
file_date_updated: 2018-08-28T09:13:01Z
has_accepted_license: '1'
intvolume: ' 81'
issue: '7'
keyword:
- tet_topic_qw
language:
- iso: eng
publication: Physical Review B
publication_identifier:
issn:
- 1098-0121
- 1550-235X
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Modeling excitonic line shapes in weakly disordered semiconductor nanostructures
type: journal_article
user_id: '16199'
volume: 81
year: '2010'
...
---
_id: '4125'
abstract:
- lang: eng
text: We numerically investigate the behavior of Whispering Gallery Modes (WGMs)
in circularly shaped resonators like microdisks, with diameters in the range of
optical vacuum wavelengths. The microdisk is embedded in an uniaxial anisotropic
dielectric environment. By changing the optical anisotropy, one obtains spectral
tunability of the optical modes. The degree of tunability strongly depends on
the radial (azimuthal) mode order M (N). As the modes approach each other spectrally,
anticrossing is observed, leading to a rearrangement of the optical states.
article_type: original
author:
- first_name: S.
full_name: Declair, S.
last_name: Declair
- first_name: Cedrik
full_name: Meier, Cedrik
id: '20798'
last_name: Meier
orcid: https://orcid.org/0000-0002-3787-3572
- 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
citation:
ama: Declair S, Meier C, Meier T, Förstner J. Anticrossing of Whispering Gallery
Modes in microdisk resonators embedded in an anisotropic environment. Photonics
and Nanostructures - Fundamentals and Applications. 2010;8(4):273-277. doi:10.1016/j.photonics.2010.03.002
apa: Declair, S., Meier, C., Meier, T., & Förstner, J. (2010). Anticrossing
of Whispering Gallery Modes in microdisk resonators embedded in an anisotropic
environment. Photonics and Nanostructures - Fundamentals and Applications,
8(4), 273–277. https://doi.org/10.1016/j.photonics.2010.03.002
bibtex: '@article{Declair_Meier_Meier_Förstner_2010, title={Anticrossing of Whispering
Gallery Modes in microdisk resonators embedded in an anisotropic environment},
volume={8}, DOI={10.1016/j.photonics.2010.03.002},
number={4}, journal={Photonics and Nanostructures - Fundamentals and Applications},
publisher={Elsevier BV}, author={Declair, S. and Meier, Cedrik and Meier, Torsten
and Förstner, Jens}, year={2010}, pages={273–277} }'
chicago: 'Declair, S., Cedrik Meier, Torsten Meier, and Jens Förstner. “Anticrossing
of Whispering Gallery Modes in Microdisk Resonators Embedded in an Anisotropic
Environment.” Photonics and Nanostructures - Fundamentals and Applications
8, no. 4 (2010): 273–77. https://doi.org/10.1016/j.photonics.2010.03.002.'
ieee: 'S. Declair, C. Meier, T. Meier, and J. Förstner, “Anticrossing of Whispering
Gallery Modes in microdisk resonators embedded in an anisotropic environment,”
Photonics and Nanostructures - Fundamentals and Applications, vol. 8, no.
4, pp. 273–277, 2010, doi: 10.1016/j.photonics.2010.03.002.'
mla: Declair, S., et al. “Anticrossing of Whispering Gallery Modes in Microdisk
Resonators Embedded in an Anisotropic Environment.” Photonics and Nanostructures
- Fundamentals and Applications, vol. 8, no. 4, Elsevier BV, 2010, pp. 273–77,
doi:10.1016/j.photonics.2010.03.002.
short: S. Declair, C. Meier, T. Meier, J. Förstner, Photonics and Nanostructures
- Fundamentals and Applications 8 (2010) 273–277.
date_created: 2018-08-27T10:19:59Z
date_updated: 2025-12-16T11:23:48Z
ddc:
- '530'
department:
- _id: '15'
- _id: '230'
- _id: '293'
- _id: '287'
- _id: '35'
- _id: '170'
- _id: '35'
- _id: '34'
- _id: '61'
doi: 10.1016/j.photonics.2010.03.002
file:
- access_level: closed
content_type: application/pdf
creator: hclaudia
date_created: 2018-08-27T10:21:38Z
date_updated: 2018-08-27T10:21:38Z
file_id: '4126'
file_name: 2010 Declair,Meier C, Meier T, Förstner_Anticrossing of Whispering Gallery
Modes in microdisk resonators embedded in an anisotropic environment.pdf
file_size: 304758
relation: main_file
success: 1
file_date_updated: 2018-08-27T10:21:38Z
has_accepted_license: '1'
intvolume: ' 8'
issue: '4'
keyword:
- tet_topic_microdisk
language:
- iso: eng
page: 273-277
publication: Photonics and Nanostructures - Fundamentals and Applications
publication_identifier:
issn:
- 1569-4410
publication_status: published
publisher: Elsevier BV
status: public
title: Anticrossing of Whispering Gallery Modes in microdisk resonators embedded in
an anisotropic environment
type: journal_article
user_id: '16199'
volume: 8
year: '2010'
...
---
_id: '4547'
abstract:
- lang: eng
text: The coherent state manipulation of single quantum systems is a fundamental
requirement for the implementation of quantum information processors. Exciton
qubits are of particular interest for coherent optoelectronic applications, in
particular due to their excellent coupling to photons. Until now, coherent manipulations
of exciton qubits in semiconductor quantum dots have been performed predominantly
by pulsed laser fields. Coherent control of the population of excitonic states
with a single laser pulse, observed by Rabi oscillations, has been demonstrated
by several groups using different techniques1,2,3. By using two laser pulses,
more general state control can be achieved4, and coupling of two excitons has
been reported5,6. Here, we present a conceptually new approach for implementing
the coherent control of an exciton two-level system (qubit) by means of a time-dependent
electric interaction. The new scheme makes use of an optical clock signal and
a synchronous electric gate signal, which controls the coherent manipulation.
article_type: original
author:
- first_name: S.
full_name: Michaelis de Vasconcellos, S.
last_name: Michaelis de Vasconcellos
- first_name: S.
full_name: Gordon, S.
last_name: Gordon
- first_name: M.
full_name: Bichler, M.
last_name: Bichler
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
- first_name: Artur
full_name: Zrenner, Artur
id: '606'
last_name: Zrenner
orcid: 0000-0002-5190-0944
citation:
ama: Michaelis de Vasconcellos S, Gordon S, Bichler M, Meier T, Zrenner A. Coherent
control of a single exciton qubit by optoelectronic manipulation. Nature Photonics.
2010;4(8):545-548. doi:10.1038/nphoton.2010.124
apa: Michaelis de Vasconcellos, S., Gordon, S., Bichler, M., Meier, T., & Zrenner,
A. (2010). Coherent control of a single exciton qubit by optoelectronic manipulation.
Nature Photonics, 4(8), 545–548. https://doi.org/10.1038/nphoton.2010.124
bibtex: '@article{Michaelis de Vasconcellos_Gordon_Bichler_Meier_Zrenner_2010, title={Coherent
control of a single exciton qubit by optoelectronic manipulation}, volume={4},
DOI={10.1038/nphoton.2010.124},
number={8}, journal={Nature Photonics}, publisher={Springer Nature}, author={Michaelis
de Vasconcellos, S. and Gordon, S. and Bichler, M. and Meier, Torsten and Zrenner,
Artur}, year={2010}, pages={545–548} }'
chicago: 'Michaelis de Vasconcellos, S., S. Gordon, M. Bichler, Torsten Meier, and
Artur Zrenner. “Coherent Control of a Single Exciton Qubit by Optoelectronic Manipulation.”
Nature Photonics 4, no. 8 (2010): 545–48. https://doi.org/10.1038/nphoton.2010.124.'
ieee: 'S. Michaelis de Vasconcellos, S. Gordon, M. Bichler, T. Meier, and A. Zrenner,
“Coherent control of a single exciton qubit by optoelectronic manipulation,” Nature
Photonics, vol. 4, no. 8, pp. 545–548, 2010, doi: 10.1038/nphoton.2010.124.'
mla: Michaelis de Vasconcellos, S., et al. “Coherent Control of a Single Exciton
Qubit by Optoelectronic Manipulation.” Nature Photonics, vol. 4, no. 8,
Springer Nature, 2010, pp. 545–48, doi:10.1038/nphoton.2010.124.
short: S. Michaelis de Vasconcellos, S. Gordon, M. Bichler, T. Meier, A. Zrenner,
Nature Photonics 4 (2010) 545–548.
date_created: 2018-09-20T12:19:52Z
date_updated: 2025-12-16T11:22:52Z
department:
- _id: '15'
- _id: '230'
- _id: '35'
- _id: '170'
- _id: '293'
- _id: '35'
doi: 10.1038/nphoton.2010.124
intvolume: ' 4'
issue: '8'
language:
- iso: eng
page: 545-548
publication: Nature Photonics
publication_identifier:
issn:
- 1749-4885
- 1749-4893
publication_status: published
publisher: Springer Nature
status: public
title: Coherent control of a single exciton qubit by optoelectronic manipulation
type: journal_article
user_id: '16199'
volume: 4
year: '2010'
...
---
_id: '4123'
abstract:
- lang: eng
text: GaAs-based semiconductor microdisks with high quality whispering gallery modes
(Q44000) have been fabricated.A layer of self-organized InAs quantumdots (QDs)
served as a light source to feed the optical modes at room temperature. In order
to achieve frequency tuning of the optical modes, the microdisk devices have been
immersed in 4 – cyano – 4´-pentylbiphenyl (5CB), a liquid crystal(LC) with a nematic
phase below the clearing temperature of TC≈34°C .We have studied the device performance
in the temperature rangeof T=20-50°C, in order to investigate the influence of
the nematic–isotropic phase transition on the optical modes. Moreover,we havea
pplied an AC electric field to the device,which leads in the nematic phase to
a reorientation of the anisotropic dielectric tensor of the liquid crystal.This
electrical anisotropy can be used to achieve electrical tunability of the optical
modes.Using the finite-difference time domain (FDTD) technique with an anisotropic
material model, we are able to describe the influence of the liquid crystal qualitatively.
article_type: original
author:
- first_name: Karoline A.
full_name: Piegdon, Karoline A.
last_name: Piegdon
- first_name: Matthias
full_name: Offer, Matthias
last_name: Offer
- first_name: Axel
full_name: Lorke, Axel
last_name: Lorke
- first_name: Martin
full_name: Urbanski, Martin
last_name: Urbanski
- first_name: Andreas
full_name: Hoischen, Andreas
last_name: Hoischen
- first_name: Heinz-Siegfried
full_name: Kitzerow, Heinz-Siegfried
id: '254'
last_name: Kitzerow
- first_name: Stefan
full_name: Declair, Stefan
last_name: Declair
- first_name: Jens
full_name: Förstner, Jens
id: '158'
last_name: Förstner
orcid: 0000-0001-7059-9862
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
- first_name: Dirk
full_name: Reuter, Dirk
id: '37763'
last_name: Reuter
- first_name: Andreas D.
full_name: Wieck, Andreas D.
last_name: Wieck
- first_name: Cedrik
full_name: Meier, Cedrik
id: '20798'
last_name: Meier
orcid: https://orcid.org/0000-0002-3787-3572
citation:
ama: 'Piegdon KA, Offer M, Lorke A, et al. Self-assembled quantum dots in a liquid-crystal-tunable
microdisk resonator. Physica E: Low-dimensional Systems and Nanostructures.
2010;42(10):2552-2555. doi:10.1016/j.physe.2009.12.051'
apa: 'Piegdon, K. A., Offer, M., Lorke, A., Urbanski, M., Hoischen, A., Kitzerow,
H.-S., Declair, S., Förstner, J., Meier, T., Reuter, D., Wieck, A. D., & Meier,
C. (2010). Self-assembled quantum dots in a liquid-crystal-tunable microdisk resonator.
Physica E: Low-Dimensional Systems and Nanostructures, 42(10), 2552–2555.
https://doi.org/10.1016/j.physe.2009.12.051'
bibtex: '@article{Piegdon_Offer_Lorke_Urbanski_Hoischen_Kitzerow_Declair_Förstner_Meier_Reuter_et
al._2010, title={Self-assembled quantum dots in a liquid-crystal-tunable microdisk
resonator}, volume={42}, DOI={10.1016/j.physe.2009.12.051},
number={10}, journal={Physica E: Low-dimensional Systems and Nanostructures},
publisher={Elsevier BV}, author={Piegdon, Karoline A. and Offer, Matthias and
Lorke, Axel and Urbanski, Martin and Hoischen, Andreas and Kitzerow, Heinz-Siegfried
and Declair, Stefan and Förstner, Jens and Meier, Torsten and Reuter, Dirk and
et al.}, year={2010}, pages={2552–2555} }'
chicago: 'Piegdon, Karoline A., Matthias Offer, Axel Lorke, Martin Urbanski, Andreas
Hoischen, Heinz-Siegfried Kitzerow, Stefan Declair, et al. “Self-Assembled Quantum
Dots in a Liquid-Crystal-Tunable Microdisk Resonator.” Physica E: Low-Dimensional
Systems and Nanostructures 42, no. 10 (2010): 2552–55. https://doi.org/10.1016/j.physe.2009.12.051.'
ieee: 'K. A. Piegdon et al., “Self-assembled quantum dots in a liquid-crystal-tunable
microdisk resonator,” Physica E: Low-dimensional Systems and Nanostructures,
vol. 42, no. 10, pp. 2552–2555, 2010, doi: 10.1016/j.physe.2009.12.051.'
mla: 'Piegdon, Karoline A., et al. “Self-Assembled Quantum Dots in a Liquid-Crystal-Tunable
Microdisk Resonator.” Physica E: Low-Dimensional Systems and Nanostructures,
vol. 42, no. 10, Elsevier BV, 2010, pp. 2552–55, doi:10.1016/j.physe.2009.12.051.'
short: 'K.A. Piegdon, M. Offer, A. Lorke, M. Urbanski, A. Hoischen, H.-S. Kitzerow,
S. Declair, J. Förstner, T. Meier, D. Reuter, A.D. Wieck, C. Meier, Physica E:
Low-Dimensional Systems and Nanostructures 42 (2010) 2552–2555.'
date_created: 2018-08-27T10:03:35Z
date_updated: 2025-12-16T11:32:03Z
ddc:
- '530'
department:
- _id: '15'
- _id: '230'
- _id: '2'
- _id: '293'
- _id: '292'
- _id: '35'
- _id: '287'
- _id: '313'
- _id: '170'
doi: 10.1016/j.physe.2009.12.051
file:
- access_level: closed
content_type: application/pdf
creator: hclaudia
date_created: 2018-08-27T10:06:57Z
date_updated: 2018-08-27T10:06:57Z
file_id: '4124'
file_name: 2010 Piegdon,Offer,Lork,Urbanski,Hoischen,Kitzerwo, Declair,Förstner_Self-assembled
quantum dots in a liquid-crystal-tunable microdisk resonator.pdf
file_size: 403248
relation: main_file
success: 1
file_date_updated: 2018-08-27T10:06:57Z
has_accepted_license: '1'
intvolume: ' 42'
issue: '10'
keyword:
- tet_topic_qd
- tet_topic_microdisk
language:
- iso: eng
page: 2552-2555
publication: 'Physica E: Low-dimensional Systems and Nanostructures'
publication_identifier:
issn:
- 1386-9477
publication_status: published
publisher: Elsevier BV
status: public
title: Self-assembled quantum dots in a liquid-crystal-tunable microdisk resonator
type: journal_article
user_id: '16199'
volume: 42
year: '2010'
...
---
_id: '4169'
abstract:
- lang: eng
text: "It is demonstrated that valence-band mixing in GaAs quantum wells tremendously
modifies electronic\r\ntransport. A coherent control scheme in which ultrafast
currents are optically injected into undoped GaAs\r\nquantum wells upon excitation
with femtosecond laser pulses is employed. An oscillatory dependence of\r\nthe
injection current amplitude and direction on the excitation photon energy is observed.
A microscopic\r\ntheoretical analysis shows that this current reversal is caused
by the coupling of the light- and heavy-hole\r\nbands and that the hole currents
dominate the overall current response. These surprising consequences of\r\nband
mixing illuminate fundamental physics as they are unique for experiments which
are able to monitor\r\nelectronic transport resulting from carriers with relatively
large momenta."
article_number: '217401'
article_type: original
author:
- first_name: S.
full_name: Priyadarshi, S.
last_name: Priyadarshi
- first_name: A. M.
full_name: Racu, A. M.
last_name: Racu
- first_name: K.
full_name: Pierz, K.
last_name: Pierz
- first_name: U.
full_name: Siegner, U.
last_name: Siegner
- first_name: M.
full_name: Bieler, M.
last_name: Bieler
- first_name: H. T.
full_name: Duc, H. T.
last_name: Duc
- first_name: Jens
full_name: Förstner, Jens
id: '158'
last_name: Förstner
orcid: 0000-0001-7059-9862
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
citation:
ama: Priyadarshi S, Racu AM, Pierz K, et al. Reversal of Coherently Controlled Ultrafast
Photocurrents by Band Mixing in Undoped GaAs Quantum Wells. Physical Review
Letters. 2010;104(21). doi:10.1103/physrevlett.104.217401
apa: Priyadarshi, S., Racu, A. M., Pierz, K., Siegner, U., Bieler, M., Duc, H. T.,
Förstner, J., & Meier, T. (2010). Reversal of Coherently Controlled Ultrafast
Photocurrents by Band Mixing in Undoped GaAs Quantum Wells. Physical Review
Letters, 104(21), Article 217401. https://doi.org/10.1103/physrevlett.104.217401
bibtex: '@article{Priyadarshi_Racu_Pierz_Siegner_Bieler_Duc_Förstner_Meier_2010,
title={Reversal of Coherently Controlled Ultrafast Photocurrents by Band Mixing
in Undoped GaAs Quantum Wells}, volume={104}, DOI={10.1103/physrevlett.104.217401},
number={21217401}, journal={Physical Review Letters}, publisher={American Physical
Society (APS)}, author={Priyadarshi, S. and Racu, A. M. and Pierz, K. and Siegner,
U. and Bieler, M. and Duc, H. T. and Förstner, Jens and Meier, Torsten}, year={2010}
}'
chicago: Priyadarshi, S., A. M. Racu, K. Pierz, U. Siegner, M. Bieler, H. T. Duc,
Jens Förstner, and Torsten Meier. “Reversal of Coherently Controlled Ultrafast
Photocurrents by Band Mixing in Undoped GaAs Quantum Wells.” Physical Review
Letters 104, no. 21 (2010). https://doi.org/10.1103/physrevlett.104.217401.
ieee: 'S. Priyadarshi et al., “Reversal of Coherently Controlled Ultrafast
Photocurrents by Band Mixing in Undoped GaAs Quantum Wells,” Physical Review
Letters, vol. 104, no. 21, Art. no. 217401, 2010, doi: 10.1103/physrevlett.104.217401.'
mla: Priyadarshi, S., et al. “Reversal of Coherently Controlled Ultrafast Photocurrents
by Band Mixing in Undoped GaAs Quantum Wells.” Physical Review Letters,
vol. 104, no. 21, 217401, American Physical Society (APS), 2010, doi:10.1103/physrevlett.104.217401.
short: S. Priyadarshi, A.M. Racu, K. Pierz, U. Siegner, M. Bieler, H.T. Duc, J.
Förstner, T. Meier, Physical Review Letters 104 (2010).
date_created: 2018-08-28T08:40:16Z
date_updated: 2025-12-16T11:32:36Z
ddc:
- '530'
department:
- _id: '15'
- _id: '293'
- _id: '170'
- _id: '230'
- _id: '35'
- _id: '34'
- _id: '61'
- _id: '27'
doi: 10.1103/physrevlett.104.217401
file:
- access_level: closed
content_type: application/pdf
creator: hclaudia
date_created: 2018-08-28T08:41:56Z
date_updated: 2018-08-28T08:41:56Z
file_id: '4170'
file_name: 2010 Priyadarshi,Racu,Pierz,Siegner,Bieler,Duc,Förstner,Meier T_Reversal
of coherently controlled ultrafast photocurrents by band mixing in undoped GaAs
quantum wells.pdf
file_size: 447293
relation: main_file
success: 1
file_date_updated: 2018-08-28T08:41:56Z
has_accepted_license: '1'
intvolume: ' 104'
issue: '21'
keyword:
- tet_topic_qw
language:
- iso: eng
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: Physical Review Letters
publication_identifier:
issn:
- 0031-9007
- 1079-7114
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Reversal of Coherently Controlled Ultrafast Photocurrents by Band Mixing in
Undoped GaAs Quantum Wells
type: journal_article
user_id: '16199'
volume: 104
year: '2010'
...
---
_id: '4167'
abstract:
- lang: eng
text: "The electromagnetic field in the vicinity of sharp edges needs a special
treatment in numeric calculation whenever accurate, fast converging results are
necessary. One of the fundamental works concerning field singularities has been
proposed in 1972 [1] and states that the electromagnetic energy density must be
integrable over any finite\r\ndomain, even if this domain contains singularities.
It is shown, that the magnetic field \x02H(\x03, ϕ) and electric field \x02E(\x03,
ϕ) are proportional to ∝ \x03(t−1) for \x03 → 0. The variable \x03 is the distance
to the edge and t has to fulfill the integrability condition and thus is restricted
to 0 < t < 1. This result is often used to reduce the error corresponding to the
singularity without increasing the numerical effort [2 - 5]. For this purpose,
a correction factor K is estimated by inserting the proportionality into the wave
equation. It is shown, that this method improves the accuracy of the result significantly,
however the order of convergence is often not studied. In [4] a method to modify
the material parameters in order to use analytic results to improve the numeric
calculation is presented. In this contribution we will - inspired by the scheme
given in [4] - develop a new method to estimate a correction factor for perfect
conducting materials (PEC) and demonstrate the improvement of the results compared
to the standard edge correction. Therefore analytic results (comparable to [1])
are consequently merged with the scheme in [4]. The main goal of this work is
the calculation of the second harmonic generation (SHG) in the wave response of
so-called metamaterials [6]. Frequently these structures\r\ncontain sharp metallic
edges with field singularities at the interfaces which have a strong impact on
the SHG signals. Thus, an accurate simulation of singularities is highly important.
However, the following approach can also be applied to many other setups, and
one of them is shown in the example below."
article_number: '11515155 '
author:
- first_name: C
full_name: Classen, C
last_name: Classen
- first_name: Jens
full_name: Förstner, Jens
id: '158'
last_name: Förstner
orcid: 0000-0001-7059-9862
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
- first_name: R
full_name: Schuhmann, R
last_name: Schuhmann
citation:
ama: 'Classen C, Förstner J, Meier T, Schuhmann R. Enhanced FDTD edge correction
for nonlinear effects calculation. In: 2010 IEEE Antennas and Propagation Society
International Symposium. IEEE; 2010. doi:10.1109/aps.2010.5562017'
apa: Classen, C., Förstner, J., Meier, T., & Schuhmann, R. (2010). Enhanced
FDTD edge correction for nonlinear effects calculation. 2010 IEEE Antennas
and Propagation Society International Symposium, Article 11515155. 2010 IEEE
international Symposium Antennas, Toronto, ON, Canada. https://doi.org/10.1109/aps.2010.5562017
bibtex: '@inproceedings{Classen_Förstner_Meier_Schuhmann_2010, title={Enhanced FDTD
edge correction for nonlinear effects calculation}, DOI={10.1109/aps.2010.5562017},
number={11515155}, booktitle={2010 IEEE Antennas and Propagation Society International
Symposium}, publisher={IEEE}, author={Classen, C and Förstner, Jens and Meier,
Torsten and Schuhmann, R}, year={2010} }'
chicago: Classen, C, Jens Förstner, Torsten Meier, and R Schuhmann. “Enhanced FDTD
Edge Correction for Nonlinear Effects Calculation.” In 2010 IEEE Antennas and
Propagation Society International Symposium. IEEE, 2010. https://doi.org/10.1109/aps.2010.5562017.
ieee: 'C. Classen, J. Förstner, T. Meier, and R. Schuhmann, “Enhanced FDTD edge
correction for nonlinear effects calculation,” presented at the 2010 IEEE international
Symposium Antennas, Toronto, ON, Canada, 2010, doi: 10.1109/aps.2010.5562017.'
mla: Classen, C., et al. “Enhanced FDTD Edge Correction for Nonlinear Effects Calculation.”
2010 IEEE Antennas and Propagation Society International Symposium, 11515155,
IEEE, 2010, doi:10.1109/aps.2010.5562017.
short: 'C. Classen, J. Förstner, T. Meier, R. Schuhmann, in: 2010 IEEE Antennas
and Propagation Society International Symposium, IEEE, 2010.'
conference:
end_date: 2010-07-17
location: Toronto, ON, Canada
name: 2010 IEEE international Symposium Antennas
start_date: 2010-07-11
date_created: 2018-08-28T08:34:52Z
date_updated: 2025-12-16T12:35:39Z
ddc:
- '530'
department:
- _id: '61'
- _id: '15'
- _id: '293'
- _id: '170'
- _id: '230'
- _id: '35'
- _id: '34'
doi: 10.1109/aps.2010.5562017
file:
- access_level: open_access
content_type: application/pdf
creator: hclaudia
date_created: 2018-08-28T08:36:44Z
date_updated: 2018-09-04T19:31:42Z
file_id: '4168'
file_name: 2010 Classen,Förstner, Meier T,Schuhmann_Enhanced FDTD edge correction
for nonlinear effects calculation.pdf
file_size: 209412
relation: main_file
file_date_updated: 2018-09-04T19:31:42Z
has_accepted_license: '1'
keyword:
- tet_topic_numerics
language:
- iso: eng
oa: '1'
publication: 2010 IEEE Antennas and Propagation Society International Symposium
publication_identifier:
isbn:
- '9781424449675'
- '9781424449682'
publication_status: published
publisher: IEEE
status: public
title: Enhanced FDTD edge correction for nonlinear effects calculation
type: conference
urn: '41677'
user_id: '16199'
year: '2010'
...
---
_id: '4172'
abstract:
- lang: eng
text: "Microdisks made from GaAs with embedded InAs quantum dots are immersed in
the liquid crystal 4-cyano-4’-pentylbiphenyl (5CB). The quantum dots serve as
emitters feeding the optical modes of the photonic cavity. By changing temperature,
the liquid crystal undergoes a phase transition from the isotropic to the nematic
state, which can be used\r\nas an effective tuning mechanism of the photonic modes
of the cavity. In the nematic state, the uniaxial electrical anisotropy of the
liquid crystal molecules can be exploited for orienting the material in an electric
field,\r\nthus externally controlling the birefringence of the material. Using
this effect, an electric field induced tuning of the modes is achieved. Numerical
simulations using the finite-differences time-domain (FDTD) technique\r\nemploying
an anisotropic dielectric medium allow to understand the alignment of the liquid
crystal molecules on the surface of the microdisk resonator."
article_number: '7946'
article_type: original
author:
- first_name: Karoline A.
full_name: Piegdon, Karoline A.
last_name: Piegdon
- first_name: Stefan
full_name: Declair, Stefan
last_name: Declair
- first_name: Jens
full_name: Förstner, Jens
id: '158'
last_name: Förstner
orcid: 0000-0001-7059-9862
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
- first_name: Heiner
full_name: Matthias, Heiner
last_name: Matthias
- first_name: Martin
full_name: Urbanski, Martin
last_name: Urbanski
- first_name: Heinz-Siegfried
full_name: Kitzerow, Heinz-Siegfried
id: '254'
last_name: Kitzerow
- first_name: Dirk
full_name: Reuter, Dirk
id: '37763'
last_name: Reuter
- first_name: Andreas D.
full_name: Wieck, Andreas D.
last_name: Wieck
- first_name: Axel
full_name: Lorke, Axel
last_name: Lorke
- first_name: Cedrik
full_name: Meier, Cedrik
id: '20798'
last_name: Meier
orcid: https://orcid.org/0000-0002-3787-3572
citation:
ama: Piegdon KA, Declair S, Förstner J, et al. Tuning quantum-dot based photonic
devices with liquid crystals. Optics Express. 2010;18(8). doi:10.1364/oe.18.007946
apa: Piegdon, K. A., Declair, S., Förstner, J., Meier, T., Matthias, H., Urbanski,
M., Kitzerow, H.-S., Reuter, D., Wieck, A. D., Lorke, A., & Meier, C. (2010).
Tuning quantum-dot based photonic devices with liquid crystals. Optics Express,
18(8), Article 7946. https://doi.org/10.1364/oe.18.007946
bibtex: '@article{Piegdon_Declair_Förstner_Meier_Matthias_Urbanski_Kitzerow_Reuter_Wieck_Lorke_et
al._2010, title={Tuning quantum-dot based photonic devices with liquid crystals},
volume={18}, DOI={10.1364/oe.18.007946},
number={87946}, journal={Optics Express}, publisher={The Optical Society}, author={Piegdon,
Karoline A. and Declair, Stefan and Förstner, Jens and Meier, Torsten and Matthias,
Heiner and Urbanski, Martin and Kitzerow, Heinz-Siegfried and Reuter, Dirk and
Wieck, Andreas D. and Lorke, Axel and et al.}, year={2010} }'
chicago: Piegdon, Karoline A., Stefan Declair, Jens Förstner, Torsten Meier, Heiner
Matthias, Martin Urbanski, Heinz-Siegfried Kitzerow, et al. “Tuning Quantum-Dot
Based Photonic Devices with Liquid Crystals.” Optics Express 18, no. 8
(2010). https://doi.org/10.1364/oe.18.007946.
ieee: 'K. A. Piegdon et al., “Tuning quantum-dot based photonic devices with
liquid crystals,” Optics Express, vol. 18, no. 8, Art. no. 7946, 2010,
doi: 10.1364/oe.18.007946.'
mla: Piegdon, Karoline A., et al. “Tuning Quantum-Dot Based Photonic Devices with
Liquid Crystals.” Optics Express, vol. 18, no. 8, 7946, The Optical Society,
2010, doi:10.1364/oe.18.007946.
short: K.A. Piegdon, S. Declair, J. Förstner, T. Meier, H. Matthias, M. Urbanski,
H.-S. Kitzerow, D. Reuter, A.D. Wieck, A. Lorke, C. Meier, Optics Express 18 (2010).
date_created: 2018-08-28T08:50:06Z
date_updated: 2025-12-16T16:44:44Z
ddc:
- '530'
department:
- _id: '15'
- _id: '287'
- _id: '293'
- _id: '292'
- _id: '35'
- _id: '230'
- _id: '313'
- _id: '170'
- _id: '27'
- _id: '34'
- _id: '61'
doi: 10.1364/oe.18.007946
file:
- access_level: open_access
content_type: application/pdf
creator: hclaudia
date_created: 2018-08-28T08:52:50Z
date_updated: 2018-09-04T20:02:01Z
file_id: '4173'
file_name: 2010 Piegdon,Declair,Förstner,Meier T,Matthias,Urbanski,Kitzerow,Reuter,Wieck,Lorcke,Meier
C_Tuning quantum-dot based photonic devices with liquid crystals.pdf
file_size: 627755
relation: main_file
file_date_updated: 2018-09-04T20:02:01Z
has_accepted_license: '1'
intvolume: ' 18'
issue: '8'
keyword:
- tet_topic_qd
- tet_topic_microdisk
language:
- iso: eng
oa: '1'
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: Optics Express
publication_identifier:
issn:
- 1094-4087
publication_status: published
publisher: The Optical Society
status: public
title: Tuning quantum-dot based photonic devices with liquid crystals
type: journal_article
urn: '41725'
user_id: '16199'
volume: 18
year: '2010'
...
---
_id: '40639'
article_number: 1134-BB09-04
author:
- first_name: J. W.
full_name: Goodby, J. W.
last_name: Goodby
- first_name: M.
full_name: Bates, M.
last_name: Bates
- first_name: I. M.
full_name: Saez, I. M.
last_name: Saez
- first_name: E.
full_name: Gorecka, E.
last_name: Gorecka
- first_name: Heinz-Siegfried
full_name: Kitzerow, Heinz-Siegfried
id: '254'
last_name: Kitzerow
- first_name: D.
full_name: Guillon, D.
last_name: Guillon
- first_name: B.
full_name: Donnio, B.
last_name: Donnio
- first_name: J.-L.
full_name: Serrano, J.-L.
last_name: Serrano
- first_name: R.
full_name: Deschenaux, R.
last_name: Deschenaux
citation:
ama: 'Goodby JW, Bates M, Saez IM, et al. Liquid Crystal Nano-particles, LCNANOP
– a SONS II Collaborative Research Project. In: Cheng Z, Zhang Q, Bauer S, Wrobleski
DA, eds. Mater. Res. Soc. Symp. Proc. 1134. Vol 1134. Mater. Res. Soc.
Symp. Proc. ; 2009.'
apa: Goodby, J. W., Bates, M., Saez, I. M., Gorecka, E., Kitzerow, H.-S., Guillon,
D., Donnio, B., Serrano, J.-L., & Deschenaux, R. (2009). Liquid Crystal Nano-particles,
LCNANOP – a SONS II Collaborative Research Project. In Z. Cheng, Q. Zhang, S.
Bauer, & D. A. Wrobleski (Eds.), Mater. Res. Soc. Symp. Proc. 1134
(No. 1134-BB09-04; Vol. 1134).
bibtex: '@inproceedings{Goodby_Bates_Saez_Gorecka_Kitzerow_Guillon_Donnio_Serrano_Deschenaux_2009,
series={Mater. Res. Soc. Symp. Proc.}, title={Liquid Crystal Nano-particles, LCNANOP
– a SONS II Collaborative Research Project}, volume={1134}, number={1134-BB09-04},
booktitle={Mater. Res. Soc. Symp. Proc. 1134}, author={Goodby, J. W. and Bates,
M. and Saez, I. M. and Gorecka, E. and Kitzerow, Heinz-Siegfried and Guillon,
D. and Donnio, B. and Serrano, J.-L. and Deschenaux, R.}, editor={Cheng, Z. and
Zhang, Q. and Bauer, S. and Wrobleski, D. A.}, year={2009}, collection={Mater.
Res. Soc. Symp. Proc.} }'
chicago: Goodby, J. W., M. Bates, I. M. Saez, E. Gorecka, Heinz-Siegfried Kitzerow,
D. Guillon, B. Donnio, J.-L. Serrano, and R. Deschenaux. “Liquid Crystal Nano-Particles,
LCNANOP – a SONS II Collaborative Research Project.” In Mater. Res. Soc. Symp.
Proc. 1134, edited by Z. Cheng, Q. Zhang, S. Bauer, and D. A. Wrobleski, Vol.
1134. Mater. Res. Soc. Symp. Proc., 2009.
ieee: J. W. Goodby et al., “Liquid Crystal Nano-particles, LCNANOP – a SONS
II Collaborative Research Project,” in Mater. Res. Soc. Symp. Proc. 1134,
2009, vol. 1134.
mla: Goodby, J. W., et al. “Liquid Crystal Nano-Particles, LCNANOP – a SONS II Collaborative
Research Project.” Mater. Res. Soc. Symp. Proc. 1134, edited by Z. Cheng
et al., vol. 1134, 1134-BB09-04, 2009.
short: 'J.W. Goodby, M. Bates, I.M. Saez, E. Gorecka, H.-S. Kitzerow, D. Guillon,
B. Donnio, J.-L. Serrano, R. Deschenaux, in: Z. Cheng, Q. Zhang, S. Bauer, D.A.
Wrobleski (Eds.), Mater. Res. Soc. Symp. Proc. 1134, 2009.'
date_created: 2023-01-28T18:58:47Z
date_updated: 2023-01-28T18:59:03Z
department:
- _id: '313'
- _id: '230'
- _id: '638'
editor:
- first_name: Z.
full_name: Cheng, Z.
last_name: Cheng
- first_name: Q.
full_name: Zhang, Q.
last_name: Zhang
- first_name: S.
full_name: Bauer, S.
last_name: Bauer
- first_name: D. A.
full_name: Wrobleski, D. A.
last_name: Wrobleski
intvolume: ' 1134'
language:
- iso: eng
publication: Mater. Res. Soc. Symp. Proc. 1134
series_title: Mater. Res. Soc. Symp. Proc.
status: public
title: Liquid Crystal Nano-particles, LCNANOP – a SONS II Collaborative Research Project
type: conference
user_id: '254'
volume: 1134
year: '2009'
...
---
_id: '41367'
author:
- first_name: Andreas
full_name: Seifert, Andreas
id: '693'
last_name: Seifert
- first_name: Annegret Helen
full_name: Hilligus, Annegret Helen
last_name: Hilligus
- first_name: Niclas
full_name: Schaper, Niclas
last_name: Schaper
citation:
ama: Seifert A, Hilligus AH, Schaper N. Entwicklung und psychometrische Überprüfung
eines Messinstruments zur Erfassung pädagogischer Kompetenzen in der universitären
Lehrerbildung. Lehrerbildung auf dem Prüfstand. 2009;2(1):82-103.
apa: Seifert, A., Hilligus, A. H., & Schaper, N. (2009). Entwicklung und psychometrische
Überprüfung eines Messinstruments zur Erfassung pädagogischer Kompetenzen in der
universitären Lehrerbildung. Lehrerbildung auf dem Prüfstand, 2(1),
82–103.
bibtex: '@article{Seifert_Hilligus_Schaper_2009, title={Entwicklung und psychometrische
Überprüfung eines Messinstruments zur Erfassung pädagogischer Kompetenzen in der
universitären Lehrerbildung.}, volume={2}, number={1}, journal={Lehrerbildung
auf dem Prüfstand}, author={Seifert, Andreas and Hilligus, Annegret Helen and
Schaper, Niclas}, year={2009}, pages={82–103} }'
chicago: 'Seifert, Andreas, Annegret Helen Hilligus, and Niclas Schaper. “Entwicklung
und psychometrische Überprüfung eines Messinstruments zur Erfassung pädagogischer
Kompetenzen in der universitären Lehrerbildung.” Lehrerbildung auf dem Prüfstand
2, no. 1 (2009): 82–103.'
ieee: A. Seifert, A. H. Hilligus, and N. Schaper, “Entwicklung und psychometrische
Überprüfung eines Messinstruments zur Erfassung pädagogischer Kompetenzen in der
universitären Lehrerbildung.,” Lehrerbildung auf dem Prüfstand, vol. 2,
no. 1, pp. 82–103, 2009.
mla: Seifert, Andreas, et al. “Entwicklung und psychometrische Überprüfung eines
Messinstruments zur Erfassung pädagogischer Kompetenzen in der universitären Lehrerbildung.”
Lehrerbildung auf dem Prüfstand, vol. 2, no. 1, 2009, pp. 82–103.
short: A. Seifert, A.H. Hilligus, N. Schaper, Lehrerbildung auf dem Prüfstand 2
(2009) 82–103.
date_created: 2023-02-01T10:27:57Z
date_updated: 2023-02-01T12:22:06Z
department:
- _id: '33'
- _id: '427'
intvolume: ' 2'
issue: '1'
language:
- iso: ger
page: 82-103
publication: Lehrerbildung auf dem Prüfstand
publication_status: published
quality_controlled: '1'
status: public
title: Entwicklung und psychometrische Überprüfung eines Messinstruments zur Erfassung
pädagogischer Kompetenzen in der universitären Lehrerbildung.
type: journal_article
user_id: '693'
volume: 2
year: '2009'
...
---
_id: '41465'
author:
- first_name: Johannes
full_name: König, Johannes
last_name: König
- first_name: Andreas
full_name: Seifert, Andreas
id: '693'
last_name: Seifert
- first_name: Sigrid
full_name: Blömeke, Sigrid
last_name: Blömeke
- first_name: Niclas
full_name: Schaper, Niclas
last_name: Schaper
citation:
ama: 'König J, Seifert A, Blömeke S, Schaper N. LEK – Längsschnittliche Erhebung
pädagogischer Kompetenzen von Lehramtsstudierenden: Testinstrumente, Forschungsdesign
und Fragestellungen. In: AEPF-Tagung „Selbstregulation – Fremdregulation“.
; 2009.'
apa: 'König, J., Seifert, A., Blömeke, S., & Schaper, N. (2009). LEK – Längsschnittliche
Erhebung pädagogischer Kompetenzen von Lehramtsstudierenden: Testinstrumente,
Forschungsdesign und Fragestellungen. AEPF-Tagung „Selbstregulation – Fremdregulation“.
AEPF-Tagung „Selbstregulation – Fremdregulation“, Bochum.'
bibtex: '@inproceedings{König_Seifert_Blömeke_Schaper_2009, title={LEK – Längsschnittliche
Erhebung pädagogischer Kompetenzen von Lehramtsstudierenden: Testinstrumente,
Forschungsdesign und Fragestellungen.}, booktitle={AEPF-Tagung „Selbstregulation
– Fremdregulation“}, author={König, Johannes and Seifert, Andreas and Blömeke,
Sigrid and Schaper, Niclas}, year={2009} }'
chicago: 'König, Johannes, Andreas Seifert, Sigrid Blömeke, and Niclas Schaper.
“LEK – Längsschnittliche Erhebung Pädagogischer Kompetenzen von Lehramtsstudierenden:
Testinstrumente, Forschungsdesign Und Fragestellungen.” In AEPF-Tagung „Selbstregulation
– Fremdregulation“, 2009.'
ieee: 'J. König, A. Seifert, S. Blömeke, and N. Schaper, “LEK – Längsschnittliche
Erhebung pädagogischer Kompetenzen von Lehramtsstudierenden: Testinstrumente,
Forschungsdesign und Fragestellungen.,” presented at the AEPF-Tagung „Selbstregulation
– Fremdregulation“, Bochum, 2009.'
mla: 'König, Johannes, et al. “LEK – Längsschnittliche Erhebung Pädagogischer Kompetenzen
von Lehramtsstudierenden: Testinstrumente, Forschungsdesign Und Fragestellungen.”
AEPF-Tagung „Selbstregulation – Fremdregulation“, 2009.'
short: 'J. König, A. Seifert, S. Blömeke, N. Schaper, in: AEPF-Tagung „Selbstregulation
– Fremdregulation“, 2009.'
conference:
end_date: 30.09.2009
location: Bochum
name: AEPF-Tagung „Selbstregulation – Fremdregulation“
start_date: 28.09.2009
date_created: 2023-02-02T10:31:56Z
date_updated: 2023-02-02T10:31:59Z
department:
- _id: '33'
- _id: '427'
language:
- iso: eng
publication: AEPF-Tagung „Selbstregulation – Fremdregulation“
quality_controlled: '1'
status: public
title: 'LEK – Längsschnittliche Erhebung pädagogischer Kompetenzen von Lehramtsstudierenden:
Testinstrumente, Forschungsdesign und Fragestellungen.'
type: conference_abstract
user_id: '693'
year: '2009'
...
---
_id: '41472'
author:
- first_name: Andreas
full_name: Seifert, Andreas
id: '693'
last_name: Seifert
- first_name: Niclas
full_name: Schaper, Niclas
last_name: Schaper
citation:
ama: 'Seifert A, Schaper N. Welche Dimensionen bzw. Modellstruktur liegt der Messung
pädagogischer Kompetenz in der universitären Lehrerausbildung zugrunde? In: AEPF-KBBB-Tagung.
; 2009.'
apa: Seifert, A., & Schaper, N. (2009). Welche Dimensionen bzw. Modellstruktur
liegt der Messung pädagogischer Kompetenz in der universitären Lehrerausbildung
zugrunde? AEPF-KBBB-Tagung. AEPF-KBBB-Tagung, Landau.
bibtex: '@inproceedings{Seifert_Schaper_2009, title={Welche Dimensionen bzw. Modellstruktur
liegt der Messung pädagogischer Kompetenz in der universitären Lehrerausbildung
zugrunde?}, booktitle={AEPF-KBBB-Tagung}, author={Seifert, Andreas and Schaper,
Niclas}, year={2009} }'
chicago: Seifert, Andreas, and Niclas Schaper. “Welche Dimensionen bzw. Modellstruktur
liegt der Messung pädagogischer Kompetenz in der universitären Lehrerausbildung
zugrunde?” In AEPF-KBBB-Tagung, 2009.
ieee: A. Seifert and N. Schaper, “Welche Dimensionen bzw. Modellstruktur liegt der
Messung pädagogischer Kompetenz in der universitären Lehrerausbildung zugrunde?,”
presented at the AEPF-KBBB-Tagung, Landau, 2009.
mla: Seifert, Andreas, and Niclas Schaper. “Welche Dimensionen bzw. Modellstruktur
liegt der Messung pädagogischer Kompetenz in der universitären Lehrerausbildung
zugrunde?” AEPF-KBBB-Tagung, 2009.
short: 'A. Seifert, N. Schaper, in: AEPF-KBBB-Tagung, 2009.'
conference:
end_date: 25.03.2009
location: Landau
name: AEPF-KBBB-Tagung
start_date: 23.03.2009
date_created: 2023-02-02T11:44:42Z
date_updated: 2023-02-02T11:44:46Z
department:
- _id: '33'
- _id: '427'
language:
- iso: ger
publication: AEPF-KBBB-Tagung
publication_status: published
quality_controlled: '1'
status: public
title: Welche Dimensionen bzw. Modellstruktur liegt der Messung pädagogischer Kompetenz
in der universitären Lehrerausbildung zugrunde?
type: conference_abstract
user_id: '693'
year: '2009'
...
---
_id: '8180'
abstract:
- lang: eng
text: 'Given a bipartite quantum state rho with subsystems A and B of arbitrary
dimensions, we study the entanglement detecting capabilities of locally noneffective,
or cyclic, unitary operations [L. B. Fu, Europhys. Lett., vol. 75, pp. 1-7, 2006].
Local cyclic unitaries have the special property that they leave their target
subsystem invariant. We investigate the distance between rho and the global state
after local application of such unitaries as a possible indicator of entanglement.
To this end, we derive and discuss closed formulae for the maximal such distance
achievable for three cases of interest: (pseudo)pure quantum states, Werner states,
and two-qubit states. What makes this criterion interesting, as we show here,
is that it surprisingly displays behavior similar to recent anomalies observed
for non-locality measures in higher dimensions, as well as demonstrates an equivalence
to the CHSH inequality for certain classes of two-qubit states. Yet, despite these
similarities, the criterion is not itself a non-locality measure. We also consider
entanglement detection in bound entangled states.'
article_type: original
author:
- first_name: Sevag
full_name: Gharibian, Sevag
id: '71541'
last_name: Gharibian
orcid: 0000-0002-9992-3379
- first_name: Hermann
full_name: Kampermann, Hermann
last_name: Kampermann
- first_name: Dagmar
full_name: Bru{\ss}, Dagmar
last_name: Bru{\ss}
citation:
ama: Gharibian S, Kampermann H, Bru{\ss} D. On global effects caused by locally
noneffective unitary operations. Quantum Information & Computation.
2009;9(11):1013-1029.
apa: Gharibian, S., Kampermann, H., & Bru{\ss}, D. (2009). On global effects
caused by locally noneffective unitary operations. Quantum Information &
Computation, 9(11), 1013–1029.
bibtex: '@article{Gharibian_Kampermann_Bru{\ss}_2009, title={On global effects caused
by locally noneffective unitary operations}, volume={9}, number={11}, journal={Quantum
Information & Computation}, author={Gharibian, Sevag and Kampermann, Hermann
and Bru{\ss}, Dagmar}, year={2009}, pages={1013–1029} }'
chicago: 'Gharibian, Sevag, Hermann Kampermann, and Dagmar Bru{\ss}. “On Global
Effects Caused by Locally Noneffective Unitary Operations.” Quantum Information
& Computation 9, no. 11 (2009): 1013–29.'
ieee: S. Gharibian, H. Kampermann, and D. Bru{\ss}, “On global effects caused by
locally noneffective unitary operations,” Quantum Information & Computation,
vol. 9, no. 11, pp. 1013–1029, 2009.
mla: Gharibian, Sevag, et al. “On Global Effects Caused by Locally Noneffective
Unitary Operations.” Quantum Information & Computation, vol. 9, no.
11, 2009, pp. 1013–29.
short: S. Gharibian, H. Kampermann, D. Bru{\ss}, Quantum Information & Computation
9 (2009) 1013–1029.
date_created: 2019-03-01T12:12:13Z
date_updated: 2023-02-28T11:04:50Z
department:
- _id: '623'
- _id: '7'
extern: '1'
external_id:
arxiv:
- '0809.4469'
intvolume: ' 9'
issue: '11'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/0809.4469
oa: '1'
page: 1013-1029
publication: Quantum Information & Computation
publication_status: published
status: public
title: On global effects caused by locally noneffective unitary operations
type: journal_article
user_id: '71541'
volume: 9
year: '2009'
...
---
_id: '8181'
abstract:
- lang: eng
text: We investigate signatures of non-classicality in quantum states, in particular,
those involved in the DQC1 model of mixed-state quantum computation [Phys. Rev.
Lett. 81, 5672 (1998)]. To do so, we consider two known non-classicality criteria.
The first quantifies disturbance of a quantum state under locally noneffective
unitary operations (LNU), which are local unitaries acting invariantly on a subsystem.
The second quantifies measurement induced disturbance (MID) in the eigenbasis
of the reduced density matrices. We study the role of both figures of non-classicality
in the exponential speedup of the DQC1 model and compare them vis-a-vis the interpretation
provided in terms of quantum discord. In particular, we prove that a non-zero
quantum discord implies a non-zero shift under LNUs. We also use the MID measure
to study the locking of classical correlations [Phys. Rev. Lett. 92, 067902 (2004)]
using two mutually unbiased bases (MUB). We find the MID measure to exactly correspond
to the number of locked bits of correlation. For three or more MUBs, it predicts
the possibility of superior locking effects.
article_type: original
author:
- first_name: Animesh
full_name: Datta, Animesh
last_name: Datta
- first_name: Sevag
full_name: Gharibian, Sevag
id: '71541'
last_name: Gharibian
orcid: 0000-0002-9992-3379
citation:
ama: Datta A, Gharibian S. Signatures of nonclassicality in mixed-state quantum
computation. Physical Review A. 2009;79(4). doi:10.1103/physreva.79.042325
apa: Datta, A., & Gharibian, S. (2009). Signatures of nonclassicality in mixed-state
quantum computation. Physical Review A, 79(4). https://doi.org/10.1103/physreva.79.042325
bibtex: '@article{Datta_Gharibian_2009, title={Signatures of nonclassicality in
mixed-state quantum computation}, volume={79}, DOI={10.1103/physreva.79.042325},
number={4}, journal={Physical Review A}, publisher={American Physical Society
(APS)}, author={Datta, Animesh and Gharibian, Sevag}, year={2009} }'
chicago: Datta, Animesh, and Sevag Gharibian. “Signatures of Nonclassicality in
Mixed-State Quantum Computation.” Physical Review A 79, no. 4 (2009). https://doi.org/10.1103/physreva.79.042325.
ieee: 'A. Datta and S. Gharibian, “Signatures of nonclassicality in mixed-state
quantum computation,” Physical Review A, vol. 79, no. 4, 2009, doi: 10.1103/physreva.79.042325.'
mla: Datta, Animesh, and Sevag Gharibian. “Signatures of Nonclassicality in Mixed-State
Quantum Computation.” Physical Review A, vol. 79, no. 4, American Physical
Society (APS), 2009, doi:10.1103/physreva.79.042325.
short: A. Datta, S. Gharibian, Physical Review A 79 (2009).
date_created: 2019-03-01T12:12:58Z
date_updated: 2023-02-28T11:05:02Z
department:
- _id: '623'
- _id: '7'
doi: 10.1103/physreva.79.042325
extern: '1'
external_id:
arxiv:
- '0811.4003'
intvolume: ' 79'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/0811.4003
oa: '1'
publication: Physical Review A
publication_identifier:
issn:
- 1050-2947
- 1094-1622
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Signatures of nonclassicality in mixed-state quantum computation
type: journal_article
user_id: '71541'
volume: 79
year: '2009'
...
---
_id: '4179'
abstract:
- lang: eng
text: 'We numerically investigate Whispering Gallery Modes (WGM) in a subwavelength
microdisk resonator [1] embedded in an uniaxial anisotropic liquid crystal environment.
It is shown that the WGMs have anticrossing behavior when modes of different radial
mode order M or azimuthal order N approach each other spectrally. '
author:
- first_name: Jens
full_name: Förstner, Jens
id: '158'
last_name: Förstner
orcid: 0000-0001-7059-9862
- first_name: S.
full_name: Declair, S.
last_name: Declair
- first_name: Cedrik
full_name: Meier, Cedrik
id: '20798'
last_name: Meier
orcid: https://orcid.org/0000-0002-3787-3572
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
citation:
ama: 'Förstner J, Declair S, Meier C, Meier T. Anticrossing of Whispering Gallery
Modes in Microdisk Resonators Embedded in a Liquid Crystal. In: Theoretical
and Computational Nanophotonics Tacona-Photonics. Vol 1176. AIP Conference
Proceedings . ; 2009:60-62. doi:10.1063/1.3253921'
apa: Förstner, J., Declair, S., Meier, C., & Meier, T. (2009). Anticrossing
of Whispering Gallery Modes in Microdisk Resonators Embedded in a Liquid Crystal.
Theoretical and Computational Nanophotonics Tacona-Photonics, 1176(1),
60–62. https://doi.org/10.1063/1.3253921
bibtex: '@inproceedings{Förstner_Declair_Meier_Meier_2009, series={AIP Conference
Proceedings }, title={Anticrossing of Whispering Gallery Modes in Microdisk Resonators
Embedded in a Liquid Crystal}, volume={1176}, DOI={10.1063/1.3253921},
number={1}, booktitle={Theoretical and Computational Nanophotonics Tacona-Photonics},
author={Förstner, Jens and Declair, S. and Meier, Cedrik and Meier, Torsten},
year={2009}, pages={60–62}, collection={AIP Conference Proceedings } }'
chicago: Förstner, Jens, S. Declair, Cedrik Meier, and Torsten Meier. “Anticrossing
of Whispering Gallery Modes in Microdisk Resonators Embedded in a Liquid Crystal.”
In Theoretical and Computational Nanophotonics Tacona-Photonics, 1176:60–62.
AIP Conference Proceedings , 2009. https://doi.org/10.1063/1.3253921.
ieee: 'J. Förstner, S. Declair, C. Meier, and T. Meier, “Anticrossing of Whispering
Gallery Modes in Microdisk Resonators Embedded in a Liquid Crystal,” in Theoretical
and Computational Nanophotonics Tacona-Photonics, Tacona, 2009, vol. 1176,
no. 1, pp. 60–62, doi: 10.1063/1.3253921.'
mla: Förstner, Jens, et al. “Anticrossing of Whispering Gallery Modes in Microdisk
Resonators Embedded in a Liquid Crystal.” Theoretical and Computational Nanophotonics
Tacona-Photonics, vol. 1176, no. 1, 2009, pp. 60–62, doi:10.1063/1.3253921.
short: 'J. Förstner, S. Declair, C. Meier, T. Meier, in: Theoretical and Computational
Nanophotonics Tacona-Photonics, 2009, pp. 60–62.'
conference:
end_date: 2009-10-28
location: Tacona
name: Theoretical and Computational Nanophotonics Tacona-Photonics
start_date: 2009-10-28
date_created: 2018-08-28T09:17:05Z
date_updated: 2023-04-19T11:13:59Z
department:
- _id: '15'
- _id: '293'
- _id: '287'
- _id: '35'
- _id: '170'
- _id: '230'
doi: 10.1063/1.3253921
intvolume: ' 1176'
issue: '1'
keyword:
- tet_topic_microdisk
language:
- iso: eng
page: 60-62
publication: Theoretical and Computational Nanophotonics Tacona-Photonics
publication_status: published
series_title: 'AIP Conference Proceedings '
status: public
title: Anticrossing of Whispering Gallery Modes in Microdisk Resonators Embedded in
a Liquid Crystal
type: conference
user_id: '49063'
volume: 1176
year: '2009'
...
---
_id: '23481'
abstract:
- lang: eng
text: A one-dimensional semiconductor nanostructure is locally excited through a
metal aperture. It is shown that the electron density can be coherently localized
at desired spatial and temporal positions by using nontrivially shaped laser pulses.
To obtain the optimized laser field, Bloch equations for a tight-binding model
system are solved together with a genetic pulse-shaping algorithm. Full three-dimensional
finite-difference time-domain (FDTD) simulations of the Maxwell–Bloch equations
confirm the predicted coherent spatiotemporal control.
author:
- first_name: Matthias
full_name: Reichelt, Matthias
id: '138'
last_name: Reichelt
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
citation:
ama: Reichelt M, Meier T. Shaping the spatiotemporal dynamics of the electron density
in a hybrid metal-semiconductor nanostructure. Optics Letters. 2009;34(19):2900-2902.
doi:10.1364/ol.34.002900
apa: Reichelt, M., & Meier, T. (2009). Shaping the spatiotemporal dynamics of
the electron density in a hybrid metal-semiconductor nanostructure. Optics
Letters, 34(19), 2900–2902. https://doi.org/10.1364/ol.34.002900
bibtex: '@article{Reichelt_Meier_2009, title={Shaping the spatiotemporal dynamics
of the electron density in a hybrid metal-semiconductor nanostructure}, volume={34},
DOI={10.1364/ol.34.002900},
number={19}, journal={Optics Letters}, author={Reichelt, Matthias and Meier, Torsten},
year={2009}, pages={2900–2902} }'
chicago: 'Reichelt, Matthias, and Torsten Meier. “Shaping the Spatiotemporal Dynamics
of the Electron Density in a Hybrid Metal-Semiconductor Nanostructure.” Optics
Letters 34, no. 19 (2009): 2900–2902. https://doi.org/10.1364/ol.34.002900.'
ieee: 'M. Reichelt and T. Meier, “Shaping the spatiotemporal dynamics of the electron
density in a hybrid metal-semiconductor nanostructure,” Optics Letters,
vol. 34, no. 19, pp. 2900–2902, 2009, doi: 10.1364/ol.34.002900.'
mla: Reichelt, Matthias, and Torsten Meier. “Shaping the Spatiotemporal Dynamics
of the Electron Density in a Hybrid Metal-Semiconductor Nanostructure.” Optics
Letters, vol. 34, no. 19, 2009, pp. 2900–02, doi:10.1364/ol.34.002900.
short: M. Reichelt, T. Meier, Optics Letters 34 (2009) 2900–2902.
date_created: 2021-08-24T08:59:15Z
date_updated: 2023-04-19T11:16:09Z
department:
- _id: '15'
- _id: '170'
- _id: '293'
- _id: '230'
doi: 10.1364/ol.34.002900
intvolume: ' 34'
issue: '19'
language:
- iso: eng
page: 2900-2902
publication: Optics Letters
publication_identifier:
issn:
- 0146-9592
- 1539-4794
publication_status: published
status: public
title: Shaping the spatiotemporal dynamics of the electron density in a hybrid metal-semiconductor
nanostructure
type: journal_article
user_id: '49063'
volume: 34
year: '2009'
...
---
_id: '4184'
abstract:
- lang: eng
text: We have experimentally investigated injection currents generated by all-optical
excitation of GaAs/AlGaAs quantum wells excited with 130 fs optical pulses. The
currents have been detected via free-space THz experiments at room temperature.
Our experiments prove that Coulomb effects strongly influence injection currents.
This becomes most prominently visible when exciting light-hole exciton transitions.
At this photon energy we observe a pronounced phase shift of the current transients
which is due to oppositely oriented heavy-hole and light-hole type contributions.
We are currently developing a microscopic theory based on a 14×14 k.p model in
combination with the semiconductor Bloch equations to describe the observed features
quantitatively. The combined theoretical and experimental approach will allow
us to analyze the influence of the bandstructure and interaction effects on the
injection current amplitude and current dynamics.
author:
- first_name: M.
full_name: Bieler, M.
last_name: Bieler
- first_name: K.
full_name: Pierz, K.
last_name: Pierz
- first_name: U.
full_name: Siegner, U.
last_name: Siegner
- first_name: P.
full_name: Dawson, P.
last_name: Dawson
- first_name: H. T.
full_name: Duc, H. T.
last_name: Duc
- first_name: Jens
full_name: Förstner, Jens
id: '158'
last_name: Förstner
orcid: 0000-0001-7059-9862
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
citation:
ama: 'Bieler M, Pierz K, Siegner U, et al. Generation of injection currents in (110)-oriented
GaAs quantum wells: experimental observation and development of a microscopic
theory. In: Tsen K-T, Song J-J, Betz M, Elezzabi AY, eds. Ultrafast Phenomena
in Semiconductors and Nanostructure Materials XIII. Vol 7214. SPIE Proceedings.
SPIE; 2009:721404-721404-721413. doi:10.1117/12.811841'
apa: 'Bieler, M., Pierz, K., Siegner, U., Dawson, P., Duc, H. T., Förstner, J.,
& Meier, T. (2009). Generation of injection currents in (110)-oriented GaAs
quantum wells: experimental observation and development of a microscopic theory.
In K.-T. Tsen, J.-J. Song, M. Betz, & A. Y. Elezzabi (Eds.), Ultrafast
Phenomena in Semiconductors and Nanostructure Materials XIII (Vol. 7214, pp.
721404-721404–721413). SPIE. https://doi.org/10.1117/12.811841'
bibtex: '@inproceedings{Bieler_Pierz_Siegner_Dawson_Duc_Förstner_Meier_2009, series={SPIE
Proceedings}, title={Generation of injection currents in (110)-oriented GaAs quantum
wells: experimental observation and development of a microscopic theory}, volume={7214},
DOI={10.1117/12.811841}, booktitle={Ultrafast
Phenomena in Semiconductors and Nanostructure Materials XIII}, publisher={SPIE},
author={Bieler, M. and Pierz, K. and Siegner, U. and Dawson, P. and Duc, H. T.
and Förstner, Jens and Meier, Torsten}, editor={Tsen, Kong-Thon and Song, Jin-Joo
and Betz, Markus and Elezzabi, Abdulhakem Y.}, year={2009}, pages={721404-721404–13},
collection={SPIE Proceedings} }'
chicago: 'Bieler, M., K. Pierz, U. Siegner, P. Dawson, H. T. Duc, Jens Förstner,
and Torsten Meier. “Generation of Injection Currents in (110)-Oriented GaAs Quantum
Wells: Experimental Observation and Development of a Microscopic Theory.” In Ultrafast
Phenomena in Semiconductors and Nanostructure Materials XIII, edited by Kong-Thon
Tsen, Jin-Joo Song, Markus Betz, and Abdulhakem Y. Elezzabi, 7214:721404-721404–13.
SPIE Proceedings. SPIE, 2009. https://doi.org/10.1117/12.811841.'
ieee: 'M. Bieler et al., “Generation of injection currents in (110)-oriented
GaAs quantum wells: experimental observation and development of a microscopic
theory,” in Ultrafast Phenomena in Semiconductors and Nanostructure Materials
XIII, San Jose (California / USA), 2009, vol. 7214, pp. 721404-721404–13,
doi: 10.1117/12.811841.'
mla: 'Bieler, M., et al. “Generation of Injection Currents in (110)-Oriented GaAs
Quantum Wells: Experimental Observation and Development of a Microscopic Theory.”
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIII,
edited by Kong-Thon Tsen et al., vol. 7214, SPIE, 2009, pp. 721404-721404–13,
doi:10.1117/12.811841.'
short: 'M. Bieler, K. Pierz, U. Siegner, P. Dawson, H.T. Duc, J. Förstner, T. Meier,
in: K.-T. Tsen, J.-J. Song, M. Betz, A.Y. Elezzabi (Eds.), Ultrafast Phenomena
in Semiconductors and Nanostructure Materials XIII, SPIE, 2009, pp. 721404-721404–13.'
conference:
location: San Jose (California / USA)
name: 'SPIE OPTO: Integrated Optoelectronic Devices, 2009'
date_created: 2018-08-28T09:35:18Z
date_updated: 2023-04-21T20:01:45Z
department:
- _id: '293'
- _id: '15'
- _id: '170'
- _id: '230'
doi: 10.1117/12.811841
editor:
- first_name: Kong-Thon
full_name: Tsen, Kong-Thon
last_name: Tsen
- first_name: Jin-Joo
full_name: Song, Jin-Joo
last_name: Song
- first_name: Markus
full_name: Betz, Markus
last_name: Betz
- first_name: Abdulhakem Y.
full_name: Elezzabi, Abdulhakem Y.
last_name: Elezzabi
intvolume: ' 7214'
keyword:
- tet_topic_qw
language:
- iso: eng
page: 721404-721404-13
publication: Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIII
publication_status: published
publisher: SPIE
series_title: SPIE Proceedings
status: public
title: 'Generation of injection currents in (110)-oriented GaAs quantum wells: experimental
observation and development of a microscopic theory'
type: conference
user_id: '49063'
volume: 7214
year: '2009'
...
---
_id: '24983'
abstract:
- lang: eng
text: 'The recently developed two-dimensional Fourier-Transform-Spectroscopy (2DFTS)
in the optical regime has been established as an elegant experiment, which has
manifold of applications in the investigation of semiconductor nanostructures.
Here we focus on the real and imaginary part 2DFT spectra. As predicted recently,
using rephasing and non-rephasing modes, we are able to determine the homogeneous
and inhomogeneous broadenings of coupled excitonic resonances even for weak disorder
where photon-echo data are not useful. Computed real and imaginary parts of the
2DFTS for rephasing and non-rephasing modes are compared with experimental data
of a GaAs quantum well. It is demonstrated, that phase sensitive data for the
rephasing and non-rephasing modes are able to accurately provide the disorder
induced broadening in a complex coupled system for each transition separately. '
author:
- first_name: Irina
full_name: Kuznetsova, Irina
last_name: Kuznetsova
- first_name: Peter
full_name: Thomas, Peter
last_name: Thomas
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
- first_name: Tianhao
full_name: Zhang, Tianhao
last_name: Zhang
- first_name: Steven T.
full_name: Cundiff, Steven T.
last_name: Cundiff
citation:
ama: 'Kuznetsova I, Thomas P, Meier T, Zhang T, Cundiff ST. Determination of homogeneous
and inhomogeneous broadenings of quantum-well excitons by 2DFTS: An experiment-theory
comparison. physica status solidi (c). 2009;6(2):445-448. doi:10.1002/pssc.200880302'
apa: 'Kuznetsova, I., Thomas, P., Meier, T., Zhang, T., & Cundiff, S. T. (2009).
Determination of homogeneous and inhomogeneous broadenings of quantum-well excitons
by 2DFTS: An experiment-theory comparison. Physica Status Solidi (c), 6(2),
445–448. https://doi.org/10.1002/pssc.200880302'
bibtex: '@article{Kuznetsova_Thomas_Meier_Zhang_Cundiff_2009, title={Determination
of homogeneous and inhomogeneous broadenings of quantum-well excitons by 2DFTS:
An experiment-theory comparison}, volume={6}, DOI={10.1002/pssc.200880302},
number={2}, journal={physica status solidi (c)}, publisher={WILEY‐VCH Verlag},
author={Kuznetsova, Irina and Thomas, Peter and Meier, Torsten and Zhang, Tianhao
and Cundiff, Steven T.}, year={2009}, pages={445–448} }'
chicago: 'Kuznetsova, Irina, Peter Thomas, Torsten Meier, Tianhao Zhang, and Steven
T. Cundiff. “Determination of Homogeneous and Inhomogeneous Broadenings of Quantum-Well
Excitons by 2DFTS: An Experiment-Theory Comparison.” Physica Status Solidi
(c) 6, no. 2 (2009): 445–48. https://doi.org/10.1002/pssc.200880302.'
ieee: 'I. Kuznetsova, P. Thomas, T. Meier, T. Zhang, and S. T. Cundiff, “Determination
of homogeneous and inhomogeneous broadenings of quantum-well excitons by 2DFTS:
An experiment-theory comparison,” physica status solidi (c), vol. 6, no.
2, pp. 445–448, 2009, doi: 10.1002/pssc.200880302.'
mla: 'Kuznetsova, Irina, et al. “Determination of Homogeneous and Inhomogeneous
Broadenings of Quantum-Well Excitons by 2DFTS: An Experiment-Theory Comparison.”
Physica Status Solidi (c), vol. 6, no. 2, WILEY‐VCH Verlag, 2009, pp. 445–48,
doi:10.1002/pssc.200880302.'
short: I. Kuznetsova, P. Thomas, T. Meier, T. Zhang, S.T. Cundiff, Physica Status
Solidi (c) 6 (2009) 445–448.
date_created: 2021-09-24T08:14:07Z
date_updated: 2023-04-21T20:06:18Z
department:
- _id: '15'
- _id: '170'
- _id: '293'
- _id: '230'
doi: 10.1002/pssc.200880302
intvolume: ' 6'
issue: '2'
language:
- iso: eng
page: 445-448
publication: physica status solidi (c)
publication_identifier:
issn:
- 1610-1634
- 1610-1642
publication_status: published
publisher: WILEY‐VCH Verlag
status: public
title: 'Determination of homogeneous and inhomogeneous broadenings of quantum-well
excitons by 2DFTS: An experiment-theory comparison'
type: journal_article
user_id: '49063'
volume: 6
year: '2009'
...
---
_id: '24982'
abstract:
- lang: eng
text: "A microscopic analysis of the emitted radiation of a semiconductor nanostructure
after excitation with an extremely intense ultrashort laser pulse is presented.
It is shown that the extreme nonlinear optical response is not sufficiently described
by pure interband transitions but one has to include intraband effects as well.\r\nNumerical
solutions of extended Bloch equations that include the coupled inter- and intraband
dynamics are presented. For large excitation intensities, the intraband effects
strongly modify the polarization dynamics and lead to a strong enhancement of
high-harmonic generation compared to pure interband dynamics."
author:
- first_name: Daniel
full_name: Golde, Daniel
last_name: Golde
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
- first_name: Stephan W.
full_name: Koch, Stephan W.
last_name: Koch
citation:
ama: Golde D, Meier T, Koch SW. Microscopic analysis of high-harmonic generation
in semiconductor nanostructures. physica status solidi (c). 2009;6(2):420-423.
doi:10.1002/pssc.200880309
apa: Golde, D., Meier, T., & Koch, S. W. (2009). Microscopic analysis of high-harmonic
generation in semiconductor nanostructures. Physica Status Solidi (c),
6(2), 420–423. https://doi.org/10.1002/pssc.200880309
bibtex: '@article{Golde_Meier_Koch_2009, title={Microscopic analysis of high-harmonic
generation in semiconductor nanostructures}, volume={6}, DOI={10.1002/pssc.200880309},
number={2}, journal={physica status solidi (c)}, publisher={WILEY‐VCH Verlag},
author={Golde, Daniel and Meier, Torsten and Koch, Stephan W.}, year={2009}, pages={420–423}
}'
chicago: 'Golde, Daniel, Torsten Meier, and Stephan W. Koch. “Microscopic Analysis
of High-Harmonic Generation in Semiconductor Nanostructures.” Physica Status
Solidi (c) 6, no. 2 (2009): 420–23. https://doi.org/10.1002/pssc.200880309.'
ieee: 'D. Golde, T. Meier, and S. W. Koch, “Microscopic analysis of high-harmonic
generation in semiconductor nanostructures,” physica status solidi (c),
vol. 6, no. 2, pp. 420–423, 2009, doi: 10.1002/pssc.200880309.'
mla: Golde, Daniel, et al. “Microscopic Analysis of High-Harmonic Generation in
Semiconductor Nanostructures.” Physica Status Solidi (c), vol. 6, no. 2,
WILEY‐VCH Verlag, 2009, pp. 420–23, doi:10.1002/pssc.200880309.
short: D. Golde, T. Meier, S.W. Koch, Physica Status Solidi (c) 6 (2009) 420–423.
date_created: 2021-09-24T08:12:48Z
date_updated: 2023-04-21T20:07:14Z
department:
- _id: '15'
- _id: '170'
- _id: '293'
- _id: '230'
doi: 10.1002/pssc.200880309
intvolume: ' 6'
issue: '2'
language:
- iso: eng
page: 420-423
publication: physica status solidi (c)
publication_identifier:
issn:
- 1610-1634
- 1610-1642
publication_status: published
publisher: WILEY‐VCH Verlag
status: public
title: Microscopic analysis of high-harmonic generation in semiconductor nanostructures
type: journal_article
user_id: '49063'
volume: 6
year: '2009'
...
---
_id: '2350'
abstract:
- lang: eng
text: 'Mapping applications that consist of a collection of cores to FPGA accelerators
and optimizing their performance is a challenging task in high performance reconfigurable
computing. We present IMORC, an architectural template and highly versatile on-chip
interconnect. IMORC links provide asynchronous FIFOs and bitwidth conversion which
allows for flexibly composing accelerators from cores running at full speed within
their own clock domains, thus facilitating the re-use of cores and portability.
Further, IMORC inserts performance counters for monitoring runtime data. In this
paper, we first introduce the IMORC architectural template and the on-chip interconnect,
and then demonstrate IMORC on the example of accelerating the k-th nearest neighbor
thinning problem on an XD1000 reconfigurable computing system. Using IMORC''s
monitoring infrastructure, we gain insights into the data-dependent behavior of
the application which, in turn, allow for optimizing the accelerator. '
author:
- first_name: Tobias
full_name: Schumacher, Tobias
last_name: Schumacher
- first_name: Christian
full_name: Plessl, Christian
id: '16153'
last_name: Plessl
orcid: 0000-0001-5728-9982
- first_name: Marco
full_name: Platzner, Marco
id: '398'
last_name: Platzner
citation:
ama: 'Schumacher T, Plessl C, Platzner M. IMORC: Application Mapping, Monitoring
and Optimization for High-Performance Reconfigurable Computing. In: Proc. Int.
Symp. on Field-Programmable Custom Computing Machines (FCCM). IEEE Computer
Society; 2009:275-278. doi:10.1109/FCCM.2009.25'
apa: 'Schumacher, T., Plessl, C., & Platzner, M. (2009). IMORC: Application
Mapping, Monitoring and Optimization for High-Performance Reconfigurable Computing.
Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM),
275–278. https://doi.org/10.1109/FCCM.2009.25'
bibtex: '@inproceedings{Schumacher_Plessl_Platzner_2009, title={IMORC: Application
Mapping, Monitoring and Optimization for High-Performance Reconfigurable Computing},
DOI={10.1109/FCCM.2009.25},
booktitle={Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM)},
publisher={IEEE Computer Society}, author={Schumacher, Tobias and Plessl, Christian
and Platzner, Marco}, year={2009}, pages={275–278} }'
chicago: 'Schumacher, Tobias, Christian Plessl, and Marco Platzner. “IMORC: Application
Mapping, Monitoring and Optimization for High-Performance Reconfigurable Computing.”
In Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM),
275–78. IEEE Computer Society, 2009. https://doi.org/10.1109/FCCM.2009.25.'
ieee: 'T. Schumacher, C. Plessl, and M. Platzner, “IMORC: Application Mapping, Monitoring
and Optimization for High-Performance Reconfigurable Computing,” in Proc. Int.
Symp. on Field-Programmable Custom Computing Machines (FCCM), 2009, pp. 275–278,
doi: 10.1109/FCCM.2009.25.'
mla: 'Schumacher, Tobias, et al. “IMORC: Application Mapping, Monitoring and Optimization
for High-Performance Reconfigurable Computing.” Proc. Int. Symp. on Field-Programmable
Custom Computing Machines (FCCM), IEEE Computer Society, 2009, pp. 275–78,
doi:10.1109/FCCM.2009.25.'
short: 'T. Schumacher, C. Plessl, M. Platzner, in: Proc. Int. Symp. on Field-Programmable
Custom Computing Machines (FCCM), IEEE Computer Society, 2009, pp. 275–278.'
date_created: 2018-04-16T15:05:52Z
date_updated: 2023-09-26T13:51:44Z
department:
- _id: '27'
- _id: '518'
- _id: '78'
doi: 10.1109/FCCM.2009.25
keyword:
- IMORC
- interconnect
- performance
language:
- iso: eng
page: 275-278
publication: Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM)
publication_identifier:
isbn:
- 978-1-4244-4450-2
publisher: IEEE Computer Society
quality_controlled: '1'
status: public
title: 'IMORC: Application Mapping, Monitoring and Optimization for High-Performance
Reconfigurable Computing'
type: conference
user_id: '15278'
year: '2009'
...