Internal energy and condensate fraction of a trapped interacting Bose gas

TL;DR

This paper develops a semiclassical two-fluid model to analyze the internal energy and condensate fraction of an interacting Bose gas in a trap, aligning well with recent experimental data for Rb-87 atoms.

Contribution

It introduces a novel semiclassical two-fluid model specifically for trapped interacting Bose gases, providing temperature-dependent predictions for internal energy and condensate fraction.

Findings

Model accurately predicts temperature dependence of condensate fraction.

Results agree with recent experimental observations.

Provides insights into thermodynamics of trapped Bose gases.

Abstract

We present a semiclassical two-fluid model for an interacting Bose gas confined in an anisotropic harmonic trap and solve it in the experimentally relevant region for a spin-polarized gas of Rb-87 atoms, obtaining the temperature dependence of the internal energy and of the condensate fraction. Our results are in agreement with recent experimental observations by Ensher et al.