Temps de cohérence d'un condensat de Bose-Einstein dans un gaz isolé harmoniquement piégé
| Autor: | Castin, Yvan, Sinatra, Alice |
|---|---|
| Přispěvatelé: | Laboratoire Kastler Brossel (LKB (Lhomond)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | francouzština |
| Rok vydání: | 2018 |
| Předmět: |
Condensed Matter::Quantum Gases
Bose-Einstein condensate [PHYS.COND.GAS]Physics [physics]/Condensed Matter [cond-mat]/Quantum Gases [cond-mat.quant-gas] atomes froids FOS: Physical sciences Bose gases cohérence temporelle trapped gases Gaz de bosons condensat de Bose-Einstein Quantum Gases (cond-mat.quant-gas) gaz piégés ultracold atoms Mots-clés : gaz de bosons Condensed Matter - Quantum Gases ultracold atoms temporal coherence |
| Zdroj: | Comptes Rendus. Physique Comptes Rendus. Physique, Académie des sciences (Paris), 2018, 19, pp.316. ⟨10.1016/j.crhy.2018.04.001⟩ |
| ISSN: | 1631-0705 1878-1535 |
| DOI: | 10.1016/j.crhy.2018.04.001⟩ |
| Popis: | We study the condensate phase dynamics in a low-temperature equilibrium gas of weakly interacting bosons, harmonically trapped and isolated from the environment. We find that at long times, much longer than the collision time between Bogoliubov quasiparticles, the variance of the phase accumulated by the condensate grows with a ballistic term quadratic in time and a diffusive term affine in time. We give the corresponding analytical expressions in the limit of a large system, in the collisionless regime and in the ergodic approximation for the quasiparticle motion. When properly rescaled, they are described by universal functions of the temperature divided by the Thomas-Fermi chemical potential. The same conclusion holds for the mode damping rates. Such universality class differs from the previously studied one of the homogeneous gas. Comment: published version in English (22 pages) and in French (23 pages) |
| Databáze: | OpenAIRE |
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