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 with the unpolarized Bose-Einstein condensate 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. RI Parcollet, Olivier/C-2340-2008; Capone, Massimo/A-7762-2008; Georges, Antoine/H-4855-2012

Polarized Superfluidity in the Attractive Hubbard Model with Population Imbalance / Dao, Tl; Ferrero, M; Georges, A; Capone, Massimo; Parcollet, O.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 101:23(2008). [10.1103/PhysRevLett.101.236405]

Polarized Superfluidity in the Attractive Hubbard Model with Population Imbalance

Capone, Massimo;
2008-01-01

Abstract

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 with the unpolarized Bose-Einstein condensate 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. RI Parcollet, Olivier/C-2340-2008; Capone, Massimo/A-7762-2008; Georges, Antoine/H-4855-2012
2008
101
23
236405
Dao, Tl; Ferrero, M; Georges, A; Capone, Massimo; Parcollet, O.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/13786
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