Field-Theoretical description of the crossover between BCS and BEC in a non-Fermi superconductor

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Using the field-theoretical methods we studied the evolution from BCS description of a non-Fermi superconductor to that of Bose-Einstein condensation (BEC) in one loop approximation. We showed that the repulsive interaction between composite bosons is determined by the exponent $α$ of the Anderson propagator in a two dimensional model. For $\a\neq 0$ the crossover is also continous and for $\a=0$ we obtain the case of the Fermi liquid.

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/29228

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/9904197
 http://arxiv.org/abs/cond-mat/9904197

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arXiv