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Title:
Many body exchange effects close to the s-wave Feshbach resonance in two-component Fermi systems: is a triplet superfluid possible?
Authors:
Gaudio, S.; Jackiewicz, J.; Bedell, K. S.
Publication:
Philosophical Magazine Letters, 87, 713-721
Publication Date:
10/2007
Origin:
AUTHOR
Keywords:
Bose-Einstein condensation, Fermi liquid theory, superfluidity
DOI:
10.1080/09500830701501823
Bibliographic Code:
2007PMagL..87..713G

Abstract

We suggest that the exchange fluctuations close to a Feshbach resonance in a two-component Fermi gas can result in an effective p-wave attractive interaction. On the BCS side of a Feshbach resonance, the magnitude of this effective interaction is comparable to the s-wave interaction, therefore leading to a possible spin-triplet superfluid in the range of temperatures of actual experiments. We also show that the particle--hole exchange fluctuations introduce an effective scattering length which does not diverge, as the standard mean-field one does. Finally, using the effective interaction quantities we are able to model the molecular binding energy on the BEC side of the resonance.
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Physics
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