Radial quadrupole and scissors modes in trapped Fermi gases across the BCS phase transition

Details Radial quadrupole and scissors modes in trapped Fermi gases across the BCS phase transition Radial quadrupole and scissors modes in trapped Fermi gases across the BCS phase transition

2008-08-27

arxiv.org/abs/0808.3719v2

Phys. Rev. A 78, 053619 (2008)

Physics

Condensed Matter

Other Condensed Matter

6 pages, v2: extended description of the theoretical method

Scientific paper

10.1103/PhysRevA.78.053619

The excitation spectra of the radial quadrupole and scissors modes of ultracold Fermi gases in elongated traps are studied across the BCS superfluid-normal phase transition in the framework of a transport theory for quasiparticles. In the limit of zero temperature, this theory reproduces the results of superfluid hydrodynamics, while in the opposite limit, above the critical temperature, it reduces to the collisionless Vlasov equation. In the intermediate temperature range, the excitation spectra have two or three broad peaks, respectively, which are roughly situated at hydrodynamic and collisionless frequencies, and whose strength is shifted from the hydrodynamic to the collisionless modes with increasing temperature. By fitting the time dependent quadrupole deformation with a damped oscillation of a single frequency, we can understand the "jump" of the frequency of the radial quadrupole mode as a function of interaction strength which has recently been reported by the Innsbruck group.

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