Large Range of Stability of Larkin-Ovchinnikov States for Imbalanced Fermi Gases in Optical Lattices

Abstract

We show that Larkin-Ovchinnikov (LO) states with modulated superfluid order parameters have a considerably larger range of stability in a lattice than in the continuum. We obtain the phase diagram for the 3D cubic attractive Hubbard model with an unequal population of up and down fermions using the Bogoliubov-de Gennes fully self-consistent method. We find a strong modulation of the local polarization that should provide a distinct signature for detection of the LO phase. The shell structure in the presence of a trap generates singularities in the density at the phase boundaries and provide additional evidence for the LO phase. Depending on specific parameters, the LO ground state occurs over a large range of population imbalance, involving 80% of the atoms in the trap, and can exist up to an entropy s ~ 0.5 k_B per fermion.

4 pages, 5 figures

References in corpus (5)

• Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
• Quasi-one-dimensional polarized Fermi superfluids
• Finite temperature phase diagram of a polarized Fermi gas in an optical lattice
• Theory of quasi-one dimensional imbalanced Fermi gases
• Larkin-Ovchinnikov state in resonant Fermi gas

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