Phys. Rev. Lett. 97, 250403 (2006) [4 pages]Experimental Evidence for the Breakdown of a Hartree-Fock Approach in a Weakly Interacting Bose GasReceived 30 June 2006; published 22 December 2006 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. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.250403
DOI:
10.1103/PhysRevLett.97.250403
PACS:
03.75.Hh, 05.30.Jp
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