We show that, to deal correctly with the pair-pair interaction in the crossover from BCS superconductivity to Bose-Einstein condensation, self-consistency in the fermionic T-matrix approximation is insufficient in the strong-coupling limit, and an appropriate set of diagrams corresponding to a dilute gas of composite bosons has to be included. The resulting effect on the pair-pair scattering length is evaluated.

Relevance of the pair-pair interaction in the crossover from BCS to Bose-Einstein condensation

PIERI, Pierbiagio;STRINATI CALVANESE, Giancarlo
2000-01-01

Abstract

We show that, to deal correctly with the pair-pair interaction in the crossover from BCS superconductivity to Bose-Einstein condensation, self-consistency in the fermionic T-matrix approximation is insufficient in the strong-coupling limit, and an appropriate set of diagrams corresponding to a dilute gas of composite bosons has to be included. The resulting effect on the pair-pair scattering length is evaluated.
2000
262
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/284983
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