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The ground-state phase diagram of attractively interacting Fermi gases in two dimensions with a population imbalance is investigated. We find the regime of stability for the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase, in which pairing occurs at a finite wave vector, and determine the magnitude of the pairing amplitude Δ and FFLO wave vector q in the ordered phase, finding that Δ can be of the order of the two-body binding energy. Our results rely on a careful analysis of the zero-temperature gap equation for the FFLO state, which possesses nonanalyticities as a function of Δ and q, invalidating a Ginzburg-Landau expansion in small Δ.

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Physical Review A - Atomic, Molecular, and Optical Physics