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

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

2006-06-30

arxiv.org/abs/quant-ph/0606247v2

Phys. Rev. Lett. 97 (22/12/2006) 250403

Physics

Quantum Physics

submitted to Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.97.250403

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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