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Quantum Monte Carlo study of a one-dimensional phase-fluctuating condensate by Gils, C.; Pollet, L.; Vernier, A.; Hebert, F.; Batrouni, G. G.; Troyer, M. is a scholarly article available to read on EtoBox.

What is Quantum Monte Carlo study of a one-dimensional phase-fluctuating condensate about?

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.

Author

Gils, C.; Pollet, L.; Vernier, A.; Hebert, F.; Batrouni, G. G.; Troyer, M.

Published

2007

Language

EN