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

Bisset, R. N., Davis, M. J., Simula, T. P. and Blakie, P. B. (2009) Quasicondensation and coherence in the quasi-two-dimensional trapped Bose gas. Physical Review A, 79 3: 033626-1-033626-8. doi:10.1103/PhysRevA.79.033626

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Author Bisset, R. N.
Davis, M. J.
Simula, T. P.
Blakie, P. B.
Title Quasicondensation and coherence in the quasi-two-dimensional trapped Bose gas
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 2009-03-30
Year available 2009
Sub-type Article (original research)
DOI 10.1103/PhysRevA.79.033626
Open Access Status File (Publisher version)
Volume 79
Issue 3
Start page 033626-1
End page 033626-8
Total pages 8
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Abstract 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 TBKT as where the system phase-space density satisfies a critical value. We observe that density fluctuations are suppressed in the system well above TBKT when a quasicondensate forms as the first occurrence of degeneracy. At lower temperatures, but still above TBKT, 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 TBKT 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-two-dimensional Bose gas and are consistent with observations made in recent experiments.
Keyword Bose-Einstein condensation
Kosterlitz-Thouless transition
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Erratum published in Physical Review A - Atomic, Molecular, and Optical Physics Volume 84, Issue 3, 14 September 2011, Article #039901

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
2010 Higher Education Research Data Collection
 
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Created: Thu, 03 Sep 2009, 18:20:07 EST by Mr Andrew Martlew on behalf of ARC Centre of Excellence for Quantum-Atom Optics