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.
Edge
Jonathan M
JM
T.C.M. Group, Cavendish Laboratory, Cambridge CB3 0HE, United Kingdom.
Cooper
N R
NR