BCS-BEC Crossover in Atomic Fermi Gases with a Narrow Resonance
Superconductivity
2008-11-26 v1 Strongly Correlated Electrons
Nuclear Theory
Abstract
We determine the effects on the BCS-BEC crossover of the energy dependence of the effective two-body interaction, which at low energies is determined by the effective range. To describe interactions with an effective range of either sign, we consider a single-channel model with a two-body interaction having an attractive square well and a repulsive square barrier. We investigate the two-body scattering properties of the model, and then solve the Eagles-Leggett equations for the zero temperature crossover, determining the momentum dependent gap and the chemical potential self-consistently. From this we investigate the dependence of the crossover on the effective range of the interaction.
Keywords
Cite
@article{arxiv.cond-mat/0604149,
title = {BCS-BEC Crossover in Atomic Fermi Gases with a Narrow Resonance},
author = {L. M. Jensen and H. M. Nilsen and Gentaro Watanabe},
journal= {arXiv preprint arXiv:cond-mat/0604149},
year = {2008}
}
Comments
12 pages, 14 figures