Quasi-one-dimensional polarized Fermi superfluids

Details Quasi-one-dimensional polarized Fermi superfluids Quasi-one-dimensional polarized Fermi superfluids

2007-09-07

arxiv.org/abs/0709.1120v2

Phys. Rev. Lett. 99, 250403 (2007)

Physics

Condensed Matter

Other Condensed Matter

4+ pages, 2 figures. References added and minor changes to text

Scientific paper

10.1103/PhysRevLett.99.250403

We calculate the zero temperature 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.

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