Finite-temperature properties of quasi-two-dimensional Bose-Einstein condensates

Kwangsik Nho, D. P. Landau

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Using the finite-temperature path integral Monte Carlo method, we investigate dilute, trapped Bose gases in a quasi-two-dimensional (quasi-2D) geometry. The quantum particles have short-range, s -wave interactions described by a hard-sphere potential whose core radius equals its corresponding scattering length. The effect of both the temperature and the interparticle interaction on the equilibrium properties such as the total energy, the density profile, and the superfluid fraction is discussed. We compare our accurate results with both the semiclassical approximation and the exact results of an ideal Bose gas. Our results show that for repulsive interactions (i) the minimum value of the aspect ratio, where the system starts to behave quasi-2D, increases as the two-body interaction strength increases; (ii) the superfluid fraction for a quasi-two-dimensionally Bose gas is distinctly different from that for both a quasi-1D Bose gas and a true 3D system, i.e., the superfluid fraction for a quasi-2D Bose gas decreases faster than that for a quasi-1D system and a true 3D system with increasing temperature, and shows a stronger dependence on the interaction strength; (iii) the superfluid fraction for a quasi-2D Bose gas lies well below the values calculated from the semiclassical approximation; and (iv) the Kosterlitz-Thouless transition temperature decreases as the strength of the interaction increases.

Original languageEnglish (US)
Article number033606
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume73
Issue number3
DOIs
StatePublished - Mar 20 2006

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Bose-Einstein condensates
gases
interactions
temperature
wave interaction
approximation
Monte Carlo method
aspect ratio
transition temperature
radii
profiles
geometry
scattering

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Finite-temperature properties of quasi-two-dimensional Bose-Einstein condensates. / Nho, Kwangsik; Landau, D. P.

In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 73, No. 3, 033606, 20.03.2006.

Research output: Contribution to journalArticle

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