Superfluidity in Three-species Mixture of Fermi Gases across Feshbach Resonances

Details Superfluidity in Three-species Mixture of Fermi Gases across Feshbach Resonances Superfluidity in Three-species Mixture of Fermi Gases across Feshbach Resonances

2006-07-18

arxiv.org/abs/cond-mat/0607459v2

Physical Review A, 75, 031603(R) (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, revised version

Scientific paper

In this letter a generalization of the BEC-BCS crossover theory to a multicomponent superfluid is presented by studying a three-species mixture of Fermi gas across two Feshbach resonances. At the BEC side of resonances, two kinds of molecules are stable which gives rise to a two-component Bose condensate. This two-component superfluid state can be experimentally identified from the radio-frequency spectroscopy, density profile and short noise measurements. As approaching the BCS side of resonances, the superfluidity will break down at some point and yield a first-order quantum phase transition to normal state, due to the mismatch of three Fermi surfaces. Phase separation instability will occur around the critical regime.

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