Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Anna Posazhennikova"'
Temporal non-equilibrium dynamics of a Bose–Josephson junction in presence of incoherent excitations
Publikováno v:
New Journal of Physics, Vol 17, Iss 1, p 013006 (2015)
The time-dependent non-equilibrium dynamics of a Bose–Einstein condensate (BEC) typically generates incoherent excitations out of the condensate due to the finite frequencies present in the time evolution. We present a detailed derivation of a gene
Externí odkaz:
https://doaj.org/article/c866991f62c3480086e6bfb44a57d8ad
Publikováno v:
Physical Review A. 106
We consider large rings of weakly-coupled Bose-Einstein condensates, analyzing their transition to chaotic dynamics and loss of coherence. Initially, a ring is considered to be in an eigenstate, i.e. in a commensurate configuration with equal site fi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d410bf2735b12535fe474343bae60460
https://doi.org/10.1103/physreva.106.033316
https://doi.org/10.1103/physreva.106.033316
Publikováno v:
Physical Review A. 103
We study the temporal expansion of an ultracold Bose gas in two-dimensional, square optical lattices. The gas is described by the Bose-Hubbard model deep in the superfluid regime, with initially all bosons condensed in the central site of the lattice
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0201be9fc030b200236898f1f9e03422
https://doi.org/10.1103/physreva.103.033311
https://doi.org/10.1103/physreva.103.033311
Publikováno v:
Physical Review A. 98
We analyze quantum phase transitions in a system of optical lattice bosons coupled to an array of atomic quantum dots, or pseudospins-1/2. The system parallels the Bose-Hubbard model with a single difference of the direct tunneling between the lattic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::de9235eca9962f00989e45ea1d3ab8f8
https://doi.org/10.1103/physreva.98.053628
https://doi.org/10.1103/physreva.98.053628
Experiments on the nonequilibrium dynamics of an isolated Bose-Einstein condensate (BEC) in a magnetic double-well trap exhibit a puzzling divergence: While some show dissipation-free Josephson oscillations, others find strong damping. Such damping i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::63d4be9a8d230fef69f486f45ebfb27f
Publikováno v:
Physical review letters. 120(10)
We predict a strong enhancement of the critical temperature in a conventional Bardeen-Cooper-Schrieffer (BCS) superconductor in the presence of a bosonic condensate of exciton-polaritons. The effect depends strongly on the ratio of the cutoff frequen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1fef8decc5e7f6bcaf9e75ef7bca88cb
https://pubmed.ncbi.nlm.nih.gov/29570326
https://pubmed.ncbi.nlm.nih.gov/29570326
If and how an isolated quantum system thermalizes despite its unitary time evolution is a long-standing, open problem of many-body physics. The eigenstate thermalization hypothesis (ETH) postulates that thermalization happens at the level of individu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c337045794eed20ec0a47fb564d6072a
http://arxiv.org/abs/1705.01754
http://arxiv.org/abs/1705.01754
Autor:
Dieter Jaksch, Stephen R. Clark, T. H. Johnson, M. Bruderer, Wolfgang Belzig, Anna Posazhennikova
Publikováno v:
Bruderer, M, Johnson, T H, Clark, S R, Jaksch, D, Posazhennikova, A & Belzig, W 2010, ' Phonon resonances in atomic currents through Bose-Fermi mixtures in optical lattices ', Physical Review A: Atomic, Molecular, and Optical Physics, vol. 82, 043617, pp. 1-7 . https://doi.org/10.1103/PhysRevA.82.043617
We present an analysis of Bose-Fermi mixtures in optical lattices for the case where the lattice potential of the fermions is tilted and the bosons (in the superfluid phase) are described by Bogoliubov phonons. It is shown that the Bogoliubov phonons
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3417276163fc377807aba06686b16d18
https://doi.org/10.1103/physreva.82.043617
https://doi.org/10.1103/physreva.82.043617
Inflationary quasiparticle creation and thermalization dynamics in coupled Bose-Einstein condensates
A Bose gas in a double-well potential, exhibiting a true Bose-Einstein condensate (BEC) amplitude and initially performing Josephson oscillations, is a prototype of an isolated, non-equilibrium many-body system. We investigate the quasiparticle (QP)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b92a4425d77a8d3e8a6fb140631a16f2
http://arxiv.org/abs/1603.04898
http://arxiv.org/abs/1603.04898
Autor:
Anna Posazhennikova
Publikováno v:
Reviews of Modern Physics. 78:1111-1134
This colloquium surveys a number of theoretical problems and open questions in the field of two-dimensional dilute Bose gases with weak repulsive interactions. In contrast to three dimensions, in two dimensions the formation of long-range order is pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::751def9dbbbff8d8141b2eff3e65fc31
https://doi.org/10.1103/revmodphys.78.1111
https://doi.org/10.1103/revmodphys.78.1111