Shear viscosity and damping for a Fermi gas in the unitarity limit

Details Shear viscosity and damping for a Fermi gas in the unitarity limit Shear viscosity and damping for a Fermi gas in the unitarity limit

2006-12-18

arxiv.org/abs/cond-mat/0612460v2

Phys.Rev.A75:043612,2007

Physics

Condensed Matter

Statistical Mechanics

7 pages, 3 figures. Discussion significantly extended. Appendix added. To appear in PRA

Scientific paper

10.1103/PhysRevA.75.043612

The shear viscosity of a two-component Fermi gas in the normal phase is calculated as a function of temperature in the unitarity limit, taking into account strong-coupling effects that give rise to a pseudogap in the spectral density for single-particle excitations. The results indicate that recent measurements of the damping of collective modes in trapped atomic clouds can be understood in terms of hydrodynamics, with a decay rate given by the viscosity integrated over an effective volume of the cloud.

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