title: Quasi-one-dimensional polarized fermi superfluids.
abstract: 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.
authors.affiliation: Department of Physics, Princeton University, Princeton, New Jersey 08544, USA. mparish@princeton.edu
authors.forename: Meera M
authors.initials: MM
authors.lastname: Parish
authors.forename: Stefan K
authors.initials: SK
authors.lastname: Baur
authors.forename: Erich J
authors.initials: EJ
authors.lastname: Mueller
authors.forename: David A
authors.initials: DA
authors.lastname: Huse