Quasi-one-dimensional polarized fermi superfluids

Meera M. Parish, Stefan K. Baur, Erich J. Mueller, David A. Huse

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We calculate the zero-temperature (T=0) phase diagram of a polarized two-component Fermi gas in an array of weakly coupled parallel one-dimensional (1D) "tubes" produced by a two-dimensional optical lattice. Increasing the lattice strength drives a crossover from three-dimensional (3D) to 1D behavior, stabilizing the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) modulated superfluid phase. We argue that the most promising regime for observing the FFLO phase is in the quasi-1D regime, where the atomic motion is largely 1D but there is weak tunneling in the other directions that stabilizes long-range order. In the FFLO phase, we describe a phase transition where the quasiparticle spectrum changes from gapless near the 3D regime to gapped in quasi-1D.

Original languageEnglish
Article number250403
JournalPhysical Review Letters
Issue number25
Publication statusPublished - 18 Dec 2007
Externally publishedYes

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