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

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

1999-04-14

arxiv.org/abs/cond-mat/9904197v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

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 $\alpha$ 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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