Deformed Fermi surfaces in ultracold Fermi gases
Superconductivity
2007-05-23 v2
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/0404577,
title = {Deformed Fermi surfaces in ultracold Fermi gases},
author = {Armen Sedrakian and Jordi Mur-Petit and Artur Polls and Herbert Müther},
journal= {arXiv preprint arXiv:cond-mat/0404577},
year = {2007}
}
Comments
v1: 12 pages, including 3 figures; v2: 5 pages, 3 figures, minor corrections. See cond-mat/0504511 for the expanded work