Collective Excitations of Trapped Imbalanced Fermion Gases

Details Collective Excitations of Trapped Imbalanced Fermion Gases Collective Excitations of Trapped Imbalanced Fermion Gases

2007-11-22

arxiv.org/abs/0711.3627v2

Phys. Rev. A 77, 041602(R) (2008)

Physics

Condensed Matter

Other Condensed Matter

4 pages; accepted for publication in PRA

Scientific paper

10.1103/PhysRevA.77.041602

We present a theoretical study of the collective excitations of a trapped imbalanced fermion gas at unitarity, when the system consists of a superfluid core and a normal outer shell. We formulate the relevant boundary conditions and treat the normal shell both hydrodynamically and collisionlessly. For an isotropic trap, we calculate the mode frequencies as a function of trap polarization. Out-of-phase modes with frequencies below the trapping frequency are obtained for the case of a hydrodynamic normal shell. For the collisionless case, we calculate the monopole mode frequencies, and find that all but the lowest mode may be damped.

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