Phases of attractive spin-imbalanced fermions in square lattices

Abstract

We determine the relative stability of different ground-state phases of spin-imbalanced popula- tions of attractive fermions in square lattices. The phases are systematically characterized by the symmetry of the order parameter and the real- and momentum-space structures using Hartree- Fock-Bogoliubov theory. We find several type of unidirectional Larkin-Ovchinikov-type phases. We discuss the effect of commensuration between the ordering wave vector and the density imbalance, and describe the mechanism of Fermi surface reconstruction and pairing for various orders. A robust supersolid phase is shown to exist when the ordering wave vector is diagonally directed.

6.5 pages, 5 figures

References in corpus (5)

• Quasi-one-dimensional polarized Fermi superfluids
• Finite temperature phase diagram of a polarized Fermi gas in an optical lattice
• Cold Attractive Spin Polarized Fermi Lattice Gases and the Doped Positive U Hubbard Model
• Fermion pairing with spin-density imbalance in an optical lattice
• Pairing in a two-dimensional Fermi gas with population imbalance

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• Numerical solution of large scale Hartree-Fock-Bogoliubov equations
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