Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2004-07-19
Phys. Rev. A 71, 013603 (2005)
Physics
Condensed Matter
Other Condensed Matter
revtex4, 8 pages, 4 figures; v2: important changes (discussion, figures, appendix and one reference added)
Scientific paper
10.1103/PhysRevA.71.013603
We investigate the "twist" mode (rotation of the upper against the lower hemisphere) of a dilute atomic Fermi gas in a spherical trap. The normal and superfluid phases are considered. The linear response to this external perturbation is calculated within the microscopic Hartree-Fock-Bogoliubov approach. In the normal phase the excitation spectrum is concentrated in a rather narrow peak very close to the trapping frequency. In the superfluid phase the strength starts to be damped and fragmented and the collectivity of the mode is progressively lost when the temperature decreases. In the weak-pairing regime some reminiscence of the collective motion still exists, whereas in the strong-pairing regime the twist mode is completely washed out. The disappearance of the twist mode in the strong-pairing regime with decreasing temperature is interpreted in the framework of the two-fluid model.
Grasso Marcella
Urban Michael
Viñas Xavier
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