Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-10-06
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
We derive the Bethe-Salpeter (BS) equations for the collective-mode spectrum of superfluid Fermi gases of equal mixture of atomic Fermi gas of two hyperfine states loaded into a moving optical lattice. In a moving lattice the superfluid state is unstable due to spontaneous emission of the short-wavelength rotonlike excitations which appear in the spectrum of the collective modes. It is shown that the spectrum obtained by the BS equations is in an excellent agreement with the collective-mode dispersion calculated by the perturbation approach, while there are some differences between the results obtained by density response function method and by the BS approach. The difference increases with increasing the lattice velocity, which can be seen in the analytical approximations for the dispersion relation in the long-wavelength limit in a weak-coupling regime.
No associations
LandOfFree
Bethe-Salpeter equations for the collective-mode spectrum of a superfluid Fermi gas in a moving optical lattice does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Bethe-Salpeter equations for the collective-mode spectrum of a superfluid Fermi gas in a moving optical lattice, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bethe-Salpeter equations for the collective-mode spectrum of a superfluid Fermi gas in a moving optical lattice will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-428277