Quasicondensation and coherence in the quasi-two-dimensional trapped Bose gas

Details Quasicondensation and coherence in the quasi-two-dimensional trapped Bose gas Quasicondensation and coherence in the quasi-two-dimensional trapped Bose gas

2008-04-02

arxiv.org/abs/0804.0286v3

Phys. Rev. A 79, 033626 (2009)

Physics

Condensed Matter

Other Condensed Matter

9 pages, 7 figures

Scientific paper

10.1103/PhysRevA.79.033626

We simulate a trapped quasi-two-dimensional Bose gas using a classical field method. To interpret our results we identify the uniform Berezinskii-Kosterlitz-Thouless (BKT) temperature $T_{BKT}$ as where the system phase space density satisfies a critical value. We observe that density fluctuations are suppressed in the system well above $T_{BKT}$ when a quasi-condensate forms as the first occurrence of degeneracy. At lower temperatures, but still above $T_{BKT}$, we observe the development of appreciable coherence as a prominent finite-size effect, which manifests as bimodality in the momentum distribution of the system. At $T_{BKT}$ algebraic decay of off-diagonal correlations occurs near the trap center with an exponent of 0.25, as expected for the uniform system. Our results characterize the low temperature phase diagram for a trapped quasi-2D Bose gas and are consistent with observations made in recent experiments.

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