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Article Dans Une Revue Physical Review Letters Année : 2006

Experimental evidence for the breakdown of a Hartree-Fock approach in a weakly interacting Bose gas

Résumé

We study the formation of a quasi-condensate in a nearly one dimensional, weakly interacting trapped atomic Bose gas. We show that a Hartree Fock (mean-field) approach fails to explain the presence of the quasi-condensate in the center of the cloud: the quasi-condensate appears through an interaction-driven cross-over and not a saturation of the excited states. Numerical calculations based on Bogoliubov theory give an estimate of the cross-over density in agreement with experimental results.
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Dates et versions

hal-00083391 , version 1 (30-06-2006)
hal-00083391 , version 2 (06-10-2006)

Identifiants

Citer

Jean-Baptiste Trebbia, Jérôme Estève, Christoph I Westbrook, Isabelle Bouchoule. Experimental evidence for the breakdown of a Hartree-Fock approach in a weakly interacting Bose gas. Physical Review Letters, 2006, 97, pp.250403. ⟨10.1103/PhysRevLett.97.250403⟩. ⟨hal-00083391v2⟩
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