Experimental evidence for the breakdown of a Hartree-Fock approach in a weakly interacting Bose gas |
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Authors: | Trebbia J-B Esteve J Westbrook C I Bouchoule I |
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Affiliation: | Laboratoire Charles Fabry, CNRS et Université Paris 11, 91403 Orsay CEDEX, France. |
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Abstract: | We investigate the physics underlying the presence of a quasicondensate in a nearly one dimensional, weakly interacting trapped atomic Bose gas. We show that a Hartree-Fock (mean-field) approach fails to predict the existence of the quasicondensate in the center of the cloud: the quasicondensate is generated by interaction-induced correlations between atoms and not by a saturation of the excited states. Numerical calculations based on Bogoliubov theory give an estimate of the crossover density in agreement with experimental results. |
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