Superfluidity, Sound Velocity and Quasi Condensation in the 2D BCS-BEC Crossover
Quantum Gases
2013-11-20 v2 Superconductivity
Abstract
We study finite-temperature properties of a two-dimensional superfluid made of ultracold alkali-metal atoms in the BCS-BEC crossover. We investigate the region below the critical temperature of the Berezinskii-Kosterlitz-Thouless phase transition, where there is quasi-condensation, by analyzing the effects of phase and amplitude fluctuations of the order parameter. In particular, we calculate the superfluid fraction, the sound velocity and the quasi-condensate fraction as a function of the temperature and of the binding energy of fermionic pairs.
Keywords
Cite
@article{arxiv.1309.7459,
title = {Superfluidity, Sound Velocity and Quasi Condensation in the 2D BCS-BEC Crossover},
author = {L. Salasnich and P. A. Marchetti and F. Toigo},
journal= {arXiv preprint arXiv:1309.7459},
year = {2013}
}
Comments
7 pages, 4 figures, improved version to be published in Phys. Rev. A