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Quantum Monte Carlo study of a 1D phase-fluctuating condensate | | C. Gils
; L. Pollet
; A. Vernier
; F. Hebert
; G.G. Batrouni
; M. Troyer
; | | Date: |
18 Jan 2007 | | Subject: | Statistical Mechanics | | Abstract: | We study numerically the low temperature behaviour of a 1D Bose gas trapped in an optical lattice. For a sufficient number of particles and weak repulsive interactions, we find a clear regime of temperatures where density fluctuations are negligible but phase fluctuations are considerable, i.e., a quasicondensate. In the weakly interacting limit, our results are in very good agreement with those obtained using a mean-field approximation. In coupling regimes beyond the validity of mean-field approaches, a phase-fluctuating condensate also appears, but the phase-correlation properties are qualitatively different. It is shown that quantum depletion plays an important role. | | Source: | arXiv, cond-mat/0701441 | | Services: | Forum | Review | PDF | Favorites | |
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