Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quasicondensation and coherence in the quasi-two-dimensional trapped
  Bose gas   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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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
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The categories of this paper are: eess
1
The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga