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

M. O. J. Heikkinen and P. Törmä
Phys. Rev. A 83, 053630 – Published 25 May 2011

Abstract

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 generalized random-phase approximation and find that, although the collective modes are damped even at zero temperature, 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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  • Received 2 March 2011

DOI:https://doi.org/10.1103/PhysRevA.83.053630

©2011 American Physical Society

Authors & Affiliations

M. O. J. Heikkinen and P. Törmä*

  • Department of Applied Physics, Aalto University School of Science, P.O.Box 15100, FI-00076 Aalto, Finland

  • *paivi.torma@aalto.fi

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Vol. 83, Iss. 5 — May 2011

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