Collective modes and the speed of sound in the Fulde-Ferrell-Larkin-Ovchinnikov state

Details Collective modes and the speed of sound in the Fulde-Ferrell-Larkin-Ovchinnikov state Collective modes and the speed of sound in the Fulde-Ferrell-Larkin-Ovchinnikov state

2011-03-03

arxiv.org/abs/1103.0696v2

Phys. Rev. A 83, 053630 (2011)

Physics

Condensed Matter

Quantum Gases

13 pages, 9 figures (revised version)

Scientific paper

10.1103/PhysRevA.83.053630

We consider the density response of a spin-imbalanced ultracold Fermi gas in an optical lattice in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. We calculate the collective mode spectrum of the system in the generalised random phase approximation and find that though the collective modes are damped even at zero tempererature, the damping is weak enough to have well-defined collective modes. We calculate the speed of sound in the gas and show that it is anisotropic due to the anisotropy of the FFLO pairing, which implies an experimental signature for the FFLO state.

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