Quantum Monte Carlo study of a one-dimensional phase-fluctuating condensate

Details Quantum Monte Carlo study of a one-dimensional phase-fluctuating condensate Quantum Monte Carlo study of a one-dimensional phase-fluctuating condensate

2007-01-18

arxiv.org/abs/cond-mat/0701441v2

Phys. Rev. A 75, 063631 (2007)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 6 figures

Scientific paper

We study numerically the low temperature behavior of a one-dimensional 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.

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