Phases of attractive spin-imbalanced fermions in square lattices

Simone Chiesa; Shiwei Zhang

doi:10.1103/physreva.88.043624

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arXiv · 1303.3812

Phases of attractive spin-imbalanced fermions in square lattices

Simone Chiesa·Shiwei Zhang

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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.

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Simone Chiesa, Shiwei Zhang. 2013-03-15. Phases of attractive spin-imbalanced fermions in square lattices. https://doi.org/10.1103/physreva.88.043624

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