Multiple condensed phases in attractively interacting Bose systems
Statistical Mechanics
2010-03-11 v4 Nuclear Theory
Abstract
We investigate a Bose gas with finite-range interaction using a scheme to eliminate unphysical processes in the T-matrix approximation. In this way the corrected T-matrix becomes suitable to calculate properties below the critical temperature. For attractive interaction, an Evans-Rashid transition occurs between a quasi-ideal Bose gas and a BCS-like phase with a gaped dispersion. The gap decreases with increasing density and vanishes at a critical density where the single-particle dispersion becomes linear for small momenta indicating Bose-Einstein condensation. The investigation of the pressure shows however, that the mentioned quantum phase transitions might be inaccessible due to a preceding first order transition.
Cite
@article{arxiv.0902.4119,
title = {Multiple condensed phases in attractively interacting Bose systems},
author = {M. Männel and K. Morawetz and P. Lipavský},
journal= {arXiv preprint arXiv:0902.4119},
year = {2010}
}