The Shear Viscosity to Entropy Density Ratio of Trapped Fermions in the Unitarity Limit

Details The Shear Viscosity to Entropy Density Ratio of Trapped Fermions in the Unitarity Limit The Shear Viscosity to Entropy Density Ratio of Trapped Fermions in the Unitarity Limit

2007-01-11

arxiv.org/abs/cond-mat/0701251v4

Phys.Rev.A76:063618,2007

Physics

Condensed Matter

Other Condensed Matter

published version

Scientific paper

10.1103/PhysRevA.76.063618

We extract the shear viscosity to entropy density ratio \eta/s of cold fermionic atoms in the unitarity limit from experimental data on the damping of collective excitations. We find that near the critical temperature \eta/s is roughly equal to 1/2 in units of \hbar/k_B. With the possible exception of the quark gluon plasma, this value is closer to the conjectured lower bound 1/(4\pi) than any other known liquid.

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