Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Friedemann Queisser"'
Publikováno v:
Physical Review Research, Vol 3, Iss 3, p 033153 (2021)
We study the enhancement of tunneling through a potential barrier V(x) by a time-dependent electric field with special emphasis on pulse-shaped vector potentials such as A_{x}(t)=A_{0}/cosh^{2}(ωt). In addition to the known effects of preacceleratio
Externí odkaz:
https://doaj.org/article/39721640758e484fb0ace93a8b0de8d4
Autor:
Jens Sonntag, Annika Kurzmann, Martin Geller, Friedemann Queisser, Axel Lorke, Ralf Schützhold
Publikováno v:
New Journal of Physics, Vol 19, Iss 6, p 063028 (2017)
We study the optical response of a suspended, monolayer graphene field-effect transistor structure in magnetic fields of up to 9 T (quantum Hall regime). With an illumination power of only 3 μ W, we measure a photocurrent of up to 400 nA (without an
Externí odkaz:
https://doaj.org/article/ec0ff74cab6548548e7719b51f470390
Publikováno v:
Physical Review Research 3(2021), 033153
We study the enhancement of tunneling through a potential barrier $V(x)$ by a time-dependent electric field with special emphasis on pulse-shaped vector potentials such as ${A}_{x}(t)={A}_{0}/{cosh}^{2}(\ensuremath{\omega}t)$. In addition to the know
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::45d753f80948ffd056b1eb976985a9a2
https://www.hzdr.de/publications/Publ-33399-1
https://www.hzdr.de/publications/Publ-33399-1
Autor:
Ralf Schützhold, Friedemann Queisser
Via the hierarchy of correlations, we study the strongly interacting Fermi-Hubbard model in the Mott insulator state and couple it to a Markovian environment that constantly monitors the particle numbers ${\stackrel{\ifmmode \hat{}\else \^{}\fi{}}{n}
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5117a90b8410dd63204259811e0aeb02
https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&origin=inward&scp=85064118582
https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&origin=inward&scp=85064118582
Publikováno v:
Physical Review B 100(2020)24, 245110
arXiv:1909.12802: https://arxiv.org/abs/1909.12802
arXiv:1909.12802: https://arxiv.org/abs/1909.12802
Motivated by the recent interest in non-equilibrium phenomena in quantum many-body systems, we study strongly interacting fermions on a lattice by deriving and numerically solving quantum Boltzmann equations that describe their relaxation to thermody
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e18504b9846197d5f0f5892c499563e5
Autor:
Ralf Schützhold, Friedemann Queisser
Publikováno v:
arXiv:1902.04905: https://arxiv.org/abs/1902.04905
Physical Review C 100(2019)4, 041601
Physical Review C 100(2019)4, 041601
We consider deuterium-tritium fusion as a generic example for general fusion reactions. For initial kinetic energies in the keV regime, the reaction rate is exponentially suppressed due to the Coulomb barrier between the nuclei, which is overcome by
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eff723f826a126fe23307fafad9b5e5a
https://www.hzdr.de/publications/Publ-29909-1
https://www.hzdr.de/publications/Publ-29909-1
Autor:
Friedemann Queisser, Uwe Bovensiepen, Ping Zhou, Manuel Ligges, Kai Rossnagel, Ralf Schützhold, I. Avigo
Publikováno v:
Physical review research 2(2), 022046 (2020). doi:10.1103/PhysRevResearch.2.022046
arXiv:1907.11677: https://arxiv.org/abs/1907.11677
arXiv:1907.11677: https://arxiv.org/abs/1907.11677
Employing time-resolved photoelectron spectroscopy we analyze the relaxation dynamics of hot electrons in the charge density wave / Mott material 1T-TaS_2. At 1.2 eV above the Fermi level we observe a hot electron lifetime of 12 +- 5 fs in the metall
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c4b296df615522ac7ea109c117c1ee4a
Autor:
Friedemann Queisser, Ralf Schützhold
Publikováno v:
Physical Review A 100(2019)5, 053617
Via the hierarchy of correlations, we study the Mott insulator phase of the Fermi-Hubbard model in the limit of strong interactions and derive a quantum Boltzmann equation describing its relaxation dynamics. In stark contrast to the weakly interactin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a609a2350c5c52921eea3320833861db
http://arxiv.org/abs/1812.08581
http://arxiv.org/abs/1812.08581
Autor:
Friedemann Queisser, Fumika Suzuki
We study quantum tunneling of a composite object, which has a dipole or quadrupole moment coupled with quantized (photon or gravitational) radiation field, through a {\delta} potential barrier. The dipole or quadrupole moment is represented by an osc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4eb3447e134fe349fc3e98cb759d532f
http://arxiv.org/abs/1705.05426
http://arxiv.org/abs/1705.05426
Publikováno v:
Physical Review A. 94
The expansion of the partition function for large coordination number $Z$ is a long standing method and has formerly been used to describe the Ising model at finite temperatures. We extend this approach and study the interacting Bose gas at finite te
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a8f5ba552e2c023bd2691d50344920ef
https://doi.org/10.1103/physreva.94.023629
https://doi.org/10.1103/physreva.94.023629