The induced interaction in a Fermi gas with a BEC-BCS crossover
Quantum Gases
2015-05-13 v1 Superconductivity
Abstract
We study the effect of the induced interaction on the superfluid transition temperature of a Fermi gas with a BEC-BCS crossover. The Gorkov-Melik-Barkhudarov theory about the induced interaction is extended from the BCS side to the entire crossover, and the pairing fluctuation is treated in the approach by Nozi\`{e}res and Schmitt-Rink. At unitarity, the induced interaction reduces the transition temperature by about twenty percent. In the BCS limit, the transition temperature is reduced by a factor about 2.22, as found by Gorkov and Melik-Barkhudarov. Our result shows that the effect of the induced interaction is important both on the BCS side and in the unitary region.
Keywords
Cite
@article{arxiv.0905.1023,
title = {The induced interaction in a Fermi gas with a BEC-BCS crossover},
author = {Zeng-Qiang Yu and Kun Huang and Lan Yin},
journal= {arXiv preprint arXiv:0905.1023},
year = {2015}
}
Comments
11 pages, 3 figures, to be published in PRA