Condensation and quasicondensation in an elongated three-dimensional Bose gas

Garrett, Michael C., Wright, Tod M. and Davis, Matthew J. (2013) Condensation and quasicondensation in an elongated three-dimensional Bose gas. Physical Review A, 87 6: 063611.1-063611.14. doi:10.1103/PhysRevA.87.063611

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Author Garrett, Michael C.
Wright, Tod M.
Davis, Matthew J.
Title Condensation and quasicondensation in an elongated three-dimensional Bose gas
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2013-06
Sub-type Article (original research)
DOI 10.1103/PhysRevA.87.063611
Open Access Status File (Publisher version)
Volume 87
Issue 6
Start page 063611.1
End page 063611.14
Total pages 14
Place of publication United States
Publisher American Physical Society
Collection year 2014
Language eng
Formatted abstract
We study the equilibrium correlations of a Bose gas in an elongated three-dimensional harmonic trap using a grand-canonical classical-field method. We focus in particular on the progressive transformation of the gas from the normal phase, through a phase-fluctuating quasicondensate regime to the so-called true-condensate regime, with decreasing temperature. Choosing realistic experimental parameters, we quantify the density fluctuations and phase coherence of the atomic field as functions of the system temperature. We identify the onset of Bose condensation through analysis of both the generalized Binder cumulant appropriate to the inhomogeneous system, and the suppression of the effective many-body T matrix that characterizes interactions between condensate atoms in the finite-temperature field. We find that the system undergoes a second-order transition to condensation near the critical temperature for an ideal Bose gas in the strongly anisotropic three-dimensional geometry but remains in a strongly phase-fluctuating quasicondensate regime until significantly lower temperatures. We characterize the crossover from a quasicondensate to a true condensate by a qualitative change in the form of the nonlocal first-order coherence function of the field and compare our results to those of previous works employing a density-phase Bogoliubov–de Gennes analysis.
Keyword Gross-Pitaevskii equation
Einstein condensation
Density profile
Matter systems
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 5 times in Scopus Article | Citations
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