4.6 Article

Fulde-Ferrell-Larkin-Ovchinnikov state of two-dimensional imbalanced Fermi gases

Journal

PHYSICAL REVIEW A
Volume 92, Issue 5, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.92.053631

Keywords

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Funding

  1. National Science Foundation [DMR-1151717, PHYS-1066293]
  2. German Academic Exchange Service (DAAD)
  3. Division Of Materials Research
  4. Direct For Mathematical & Physical Scien [1151717] Funding Source: National Science Foundation

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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 Delta and FFLO wave vector q in the ordered phase, finding that Delta 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 Delta and q, invalidating a Ginzburg-Landau expansion in small Delta.

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