BCS-BEC Crossover in a Gas of Fermi Atoms with a Feshbach Resonance

Y. Ohashi, A. Griffin

Research output: Contribution to journalArticlepeer-review

448 Citations (Scopus)


We discuss the BCS-BEC crossover in a degenerate Fermi gas of two hyperfine states interacting close to a Feshbach resonance. We show that, by including fluctuation contributions to the free energy similar to that considered by Nozières and Schmitt-Rink, the character of the superfluid phase transition continuously changes from the BCS-type to the BEC-type, as the threshold of the quasimolecular band is lowered. In the BEC regime, the superfluid phase transition is interpreted in terms of molecules associated with both the Feshbach resonance and Cooper pairing.

Original languageEnglish
JournalPhysical review letters
Issue number13
Publication statusPublished - 2002
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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