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arXiv:cond-mat/9809356 · The European Physical Journal B

Bose-Einstein condensation in interacting gases

Markus Holzmann, P. Grüter, Franck Laloë

Published Aug 1, 1999• 51 citations
arXivHTMLPDF
DOI
10.1007/s100510050905

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The Bose-Einstein condensation (BEC) of weakly interacting Bose gases has been realized recently in experiment. The condensation temperature of a uniform interacting Bose gas is an important thermodynamic quantity fot the BEC. In this paper, the pseudopotential method and grand canonical ensemble are used to investigate the condensation temperature of the uniform interacting Bose gas. The results show that, due to the interaction between particles, the shift of the condensation temperature is δT c/T c=-2.9an 1/3 , where a and n are the two-particle scattering length of S- wave and the particle number density, respectively.
We discuss Bose-Einstein condensation (BEC) in quasi-2D trapped gases and find that well below the transition temperature T(c) the equilibrium state is a true condensate, whereas at intermediate temperatures T<T(c) one has a quasicondensate (condensate with fluctuating phase). The mean-field interaction in a quasi-2D gas is sensitive to the frequency omega(0) of the (tight) confinement in the "frozen" direction, and one can switch the sign of the interaction by changing omega(0). Variation of omega(0) can also reduce the rates of inelastic processes. This offers promising prospects for tunable BEC in trapped quasi-2D gases.