Polarized superfluidity in the attractive Hubbard model with population imbalance

Details Polarized superfluidity in the attractive Hubbard model with population imbalance Polarized superfluidity in the attractive Hubbard model with population imbalance

2008-07-18

arxiv.org/abs/0807.2923v2

Phys. Rev. Lett. 101, 236405 (2008)

Physics

Condensed Matter

Superconductivity

4+ pages, 4 figures, new version

Scientific paper

10.1103/PhysRevLett.101.236405

We study a two-component Fermi system with attractive interactions and different populations of the two species in a cubic lattice. For an intermediate coupling we find a uniformly polarized superfluid which is stable down to very low temperatures. The momentum distribution of this phase closely resembles that of the Sarma phase, characterized by two Fermi surfaces. This phase is shown to be stabilized by a potential energy gain, as in a BCS superfluid, in contrast to the unpolarized BEC which is stabilized by kinetic energy. We present general arguments suggesting that preformed pairs in the unpolarized superfluid favor the stabilization of a polarized superfluid phase.

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