BCS-BEC crossover in a trapped gas of Fermi atoms with a Feshbach resonance

Yoji Ohashi, Allan Griffin

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


We present a theoretical study of the BCS-BEC (Bose-Einstein condensation) crossover in a trapped gas of Fermi atoms including the effect of a Feshbach resonance. Going past the simple mean field approximation, we include the effect of fluctuations in the strong coupling limit involving two kinds of Bose molecules, i.e., Feshbach molecules associated with the resonance and preformed Cooper-pairs in which the pairing interaction is mediated by Feshbach quasi-molecules. The superfluid phase transition is shown to change continuously from the BCS-type to a BEC of these two kinds of Bosons, as the threshold energy of the Feshbach resonance is lowered.

Original languageEnglish
Pages (from-to)40-41
Number of pages2
JournalPhysica B: Condensed Matter
Publication statusPublished - 2003 May
Externally publishedYes
EventProceedings of the 23rd international conference on low temper - Hiroshima, Japan
Duration: 2002 Aug 202002 Aug 27


  • BCS-BEC crossover
  • Cold gas of Fermi atoms
  • Feshbach resonance
  • Superfluidity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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