Signature of the Fulde-Ferrell-Larkin-Ovchinnikov phase in the collective modes of a trapped ultracold Fermi gas.
We study theoretically the collective modes of a two-component Fermi gas with attractive interactions in a quasi-one-dimensional harmonic trap. We focus on an imbalanced gas in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. Using a mean-field theory, we study the response of the ground state to time-dependent potentials. For potentials with short wavelengths, we find dramatic signatures in the large-scale response of the gas which are characteristic of the FFLO phase. This response provides an effective way to detect the FFLO state in experiments.
T.C.M. Group, Cavendish Laboratory, Cambridge CB3 0HE, United Kingdom.
Jonathan M
JM
Edge
N R
NR
Cooper