Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Nikolaj Bittner"'
Autor:
Konrad Gillmeister, Denis Golež, Cheng-Tien Chiang, Nikolaj Bittner, Yaroslav Pavlyukh, Jamal Berakdar, Philipp Werner, Wolf Widdra
Publikováno v:
Nature Communications, Vol 11, Iss 1, Pp 1-9 (2020)
Nickel Oxide (NiO) is a strongly correlated insulator with antiferromagnetic (AFM) ordering. Here, using pump-probe photoemission on NiO, the authors observe coherent terahertz oscillations in the photoemission signal, a signature of an in-gap state
Externí odkaz:
https://doaj.org/article/a52bdd48b2014fc7a8a5da39004ed897
Autor:
Götz S. Uhrig, Nathan Cheng, Benedikt Fauseweh, Nikolaj Bittner, Dirk Manske, Andreas P. Schnyder, Lukas Schwarz, H. Krull, Stefan Kaiser, Mona Berciu, Naoto Tsuji
Publikováno v:
Nature Communications, Vol 11, Iss 1, Pp 1-9 (2020)
Nature Communications
Nature Communications
Recent findings of new Higgs modes in unconventional superconductors require a classification and characterization of the modes allowed by nontrivial gap symmetry. Here we develop a theory for a tailored nonequilibrium quantum quench to excite all po
Publikováno v:
Physical Review B
Physical Review B, American Physical Society, 2021, 104 (11), ⟨10.1103/PhysRevB.104.115138⟩
Physical Review B, 2021, 104 (11), ⟨10.1103/PhysRevB.104.115138⟩
Physical Review B, American Physical Society, 2021, 104 (11), ⟨10.1103/PhysRevB.104.115138⟩
Physical Review B, 2021, 104 (11), ⟨10.1103/PhysRevB.104.115138⟩
International audience; Using a real-time implementation of the self-consistent GW method, we theoretically investigate the photoinduced changes in the electronic structure of the quasi two-dimensional semi-metal BaNiS2. This material features four D
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d656ecae54c020f042a6057177b1bba6
https://hal.archives-ouvertes.fr/hal-03450367/document
https://hal.archives-ouvertes.fr/hal-03450367/document
Publikováno v:
Physical Review B
We theoretically investigate the effects of the lattice geometry on the nonequilibrium dynamics of photo-excited carriers in a half-filled two-dimensional Hubbard model. Using a nonequilibrium generalization of the dynamical cluster approximation, we
Publikováno v:
Physical Review B
We investigate the effect of nonlocal interactions on the photodoped Mott insulating state of the two-dimensional Hubbard model using a nonequilibrium generalization of the dynamical cluster approximation. In particular, we compare the situation wher
Using a nonequilibrium implementation of the Lanczos-based exact diagonalisation technique we study the possibility of the light-induced superconducting phase coherence in a solid state system after an ultrafast optical excitation. In particular, we
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f25b8fdd6268e69f40854007453f48b2
http://doc.rero.ch/record/324706/files/bitt_pli.pdf
http://doc.rero.ch/record/324706/files/bitt_pli.pdf
Autor:
Andreas Herrmann, Michael Schüler, Yuta Murakami, Martin Eckstein, Nikolaj Bittner, Philipp Werner, Hugo U. R. Strand, Denis Golež
Publikováno v:
Computer Physics Communications. 257:107484
The nonequilibrium dynamics of correlated many-particle systems is of interest in connection with pump-probe experiments on molecular systems and solids, as well as theoretical investigations of transport properties and relaxation processes. Nonequil
Publikováno v:
Nature Communications, Vol 7, Iss 1, Pp 1-7 (2016)
Nature Communications
Nature Communications
Collective excitation modes are a characteristic feature of symmetry-broken phases of matter. For example, superconductors exhibit an amplitude Higgs mode and a phase mode, which are the radial and angular excitations in the Mexican-hat potential of
Autor:
Nikolaj Bittner, Dietrich Einzel
Publikováno v:
Journal of Low Temperature Physics. 174:184-206
We present a systematic study of the response properties of two-band (multi-gap) superconductors with spin-singlet (s-wave) pairing correlations, which are assumed to be caused by both intraband (\lambda_{ii}, i=1,2) and interband (\lambda_{12}) pair
Publikováno v:
PHYSICAL REVIEW LETTERS
We develop a microscopic and gauge-invariant theory for collective modes resulting from the phase of the superconducting order parameter in non-centrosymmetric superconductors. Considering various crystal symmetries we derive the corresponding gauge