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

M.O.J. Heikkinen, P. Törmä

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)
298 Downloads (Pure)

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.
Original languageEnglish
Article number053630
Pages (from-to)1-12
Number of pages12
JournalPhysical Review A
Volume83
Issue number5
DOIs
Publication statusPublished - 25 May 2011
MoE publication typeA1 Journal article-refereed

Keywords

  • Collective modes
  • Quantum gases
  • Superfluidity

Fingerprint Dive into the research topics of 'Collective modes and the speed of sound in the Fulde-Ferrell-Larkin-Ovchinnikov state'. Together they form a unique fingerprint.

Cite this