Pairing in a three component Fermi gas

Details Pairing in a three component Fermi gas Pairing in a three component Fermi gas

2006-03-20

arxiv.org/abs/cond-mat/0603498v3

Phys. Rev. A 73, 053606 (2006)

Physics

Condensed Matter

Superconductivity

10 pages, 3 figures

Scientific paper

10.1103/PhysRevA.73.053606

We consider pairing in a three-component gas of degenerate fermions. In particular, we solve the finite temperature mean-field theory of an interacting gas for a system where both interaction strengths and fermion masses can be unequal. At zero temperature we find a a possibility of a quantum phase transition between states associated with pairing between different pairs of fermions. On the other hand, finite temperature behavior of the three-component system reveals some qualitative differences from the two-component gas: for a range of parameters it is possible to have two different critical temperatures. The lower one corresponds to a transition between different pairing channels, while the higher one corresponds to the usual superfluid-normal transition. We discuss how these phase transitions could be observed in ultracold gases of fermionic atoms.

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