Deformed Fermi surfaces in ultracold Fermi gases

Details Deformed Fermi surfaces in ultracold Fermi gases Deformed Fermi surfaces in ultracold Fermi gases

2004-04-23

arxiv.org/abs/cond-mat/0404577v2

Physics

Condensed Matter

Superconductivity

v1: 12 pages, including 3 figures; v2: 5 pages, 3 figures, minor corrections. See cond-mat/0504511 for the expanded work

Scientific paper

The superfluid transition in an ultracold two-component atomic Fermi gas is analyzed in the case where the two components have different densities. We describe a superfluid state which spontaneously breaks the rotational-symmetry by deforming the Fermi surfaces of both species into ellipsoidal form. At relatively large hyperfine-spin asymmetries, this deformation is shown to help the appearance of pairing, which in the rotationally-symmetric (BCS) case would be forbidden by Pauli blocking. The prospects for experimental detection of such a deformed Fermi surface phase are discussed.

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