BCS-BEC Crossover in Atomic Fermi Gases with a Narrow Resonance

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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.
12 pages, 14 figures

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Superconductivity, Strongly Correlated Electrons, Nuclear Theory

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http://salesiana.dossiersoluciones.com/handle/123456789/201043

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0604149
 http://arxiv.org/abs/cond-mat/0604149
 Phys.Rev.A74:043608,2005
 doi:10.1103/PhysRevA.74.043608

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arXiv