BCS-BEC crossover in a superfluid Fermi gas

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We discuss the superfluid phase transition in a gas of Fermi atoms with a Feshbach resonance. A tunable pairing interaction associated with the Feshbach resonance is shown to naturally lead to the BCS-BEC crossover, where the character of superfluidity continuously changes from the weak-coupling Bardeen-Cooper-Schrieffer (BCS) type to the Bose-Einstein condensation (BEC) of tightly bound molecules, as one decreases the threshold energy 2ν of the Feshbach resonance. We also discuss effects of a trap, as well as the p-wave BCS-BEC crossover adjusted by a p-wave Feshbach resonance.

Original languageEnglish
Pages (from-to)5204-5213
Number of pages10
JournalInternational Journal of Modern Physics B
Issue number30-31
Publication statusPublished - 2006 Dec 20
Externally publishedYes


  • BCS-BEC crossover
  • Strong-coupling superfluid theory
  • Superfluid Fermi gas

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics


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