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.File in questo prodotto:
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