Collective modes in the anisotropic unitary Fermi gas and the inclusion of a backflow term
arXiv:1308.5922 · doi:10.1103/PhysRevA.88.033610
Abstract
We study the collective modes of the confined unitary Fermi gas under anisotropic harmonic confinement as a function of the number of atoms. We use the equations of extended superfluid hydrodynamics, which take into account a dispersive von Weizsacker-like term in the equaton of state. We also discuss the inclusion of a backflow term in the extended superfluid Lagrangian and the effects of this anomalous term on sound waves and Beliaev damping of phonons.
6 pages, 2 figures, to be published in Phys. Rev. A