Angular Fulde-Ferrell-Larkin-Ovchinnikov state in cold fermion gases in a toroidal trap

Details Angular Fulde-Ferrell-Larkin-Ovchinnikov state in cold fermion gases in a toroidal trap Angular Fulde-Ferrell-Larkin-Ovchinnikov state in cold fermion gases in a toroidal trap

2009-02-13

arxiv.org/abs/0902.2275v3

Physics

Condensed Matter

Other Condensed Matter

final version for publication in Phys. Rev. B Rapid Communication

Scientific paper

We study the possibility of angular Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, in which the rotation symmetry is spontaneously broken, in population imbalanced fermion gases near the BCS-BEC crossover. We investigate the superfluid gases at low temperatures on the basis of the Bogoliubov-de Gennes equation, and examine the stability against thermal fluctuations using the T-matrix approach beyond the local-density approximation (LDA). We find that the angular FFLO state is stabilized in the gases confined in the toroidal trap but not in the harmonic trap. The angular FFLO state is stable near the BCS-BEC crossover owing to the formation of pseudogap. Spatial dependences of number density and local population imbalance are shown for an experimental test.

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