Zobrazeno 1 - 10 of 11 pro vyhledávání: '"Petr O. Fedichev"'
2
Fermi one-dimensional quantum gas: Luttinger liquid approach and spin charge separation
Autor: Peter Zoller, Wilhelm Zwerger, Petr O. Fedichev, Alessio Recati
Publikováno v: Journal of Optics B: Quantum and Semiclassical Optics. 5:S55-S64
We discuss the properties of quasi-1D quantum gases of fermionic atoms using the Luttinger liquid theory, including the presence of an optical lattice and of a longitudinal trapping potential. We analyze in particular the nature and manifestations of
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::23fe6b54545a325fb95ef2ac3f811311
https://doi.org/10.1088/1464-4266/5/2/359
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6
Zero-temperature damping of Bose-Einstein condensate oscillations by vortex-antivortex pair creation
Autor: Alessio Recati, Petr O. Fedichev, Uwe R. Fischer
Publikováno v: Physical Review A. 68
We investigate vortex-antivortex pair creation in a supersonically expanding and contracting quasi-2D Bose-Einstein condensate at zero temperature. For sufficiently large amplitude condensate oscillations, pair production provides the leading dissipa
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9b8495487e5074ff3e2b002198956759
https://doi.org/10.1103/physreva.68.011602
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7
Gibbons-Hawking Effect in the Sonic de Sitter Space-Time of an Expanding Bose-Einstein-Condensed Gas
Autor: Uwe R. Fischer, Petr O. Fedichev
We propose an experimental scheme to observe the Gibbons-Hawking effect in the acoustic analog of a 1+1-dimensional de Sitter universe, produced in an expanding, cigar-shaped Bose-Einstein condensate. It is shown that a two-level system created at th
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4927d302b9e2dd60e5acbef02caa4e84
http://arxiv.org/abs/cond-mat/0304342
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8
Observer dependence for the phonon content of the sound field living on the effective curved space-time background of a Bose-Einstein condensate
Autor: Uwe R. Fischer, Petr O. Fedichev
We demonstrate that the ambiguity of the particle content for quantum fields in a generally curved space-time can be experimentally investigated in an ultracold gas of atoms forming a Bose-Einstein condensate. We explicitly evaluate the response of a
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::349f2418d8c10c2708c47be4e1bc7093
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9
'Cosmological' quasiparticle production in harmonically trapped superfluid gases
Autor: Uwe R. Fischer, Petr O. Fedichev
We show that a variety of cosmologically motivated effective quasiparticle space-times can be produced in harmonically trapped superfluid Bose and Fermi gases. We study the analogue of cosmological particle production in these effective space-times,
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::66d792fec55b8acbdc422593ed4a8930
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10
Equilibrium properties and dissipative dynamics of vortex arrays in trapped Bose-condensed gases
Autor: A. E. Muryshev, Petr O. Fedichev
Publikováno v: Physical Review A. 65
We develop a theory of equilibrium properties and dissipative dynamics of large vortex arrays in trapped Bose-condensed gases. We prove that, in spite of the spatial inhomogeneity of the condensate density profile in trapped gases, the equilibrium co
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0b913c2201225427ab730d4f1213d818
https://doi.org/10.1103/physreva.65.061601
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