Shear viscosity of a superfluid Fermi gas in the unitarity limit
arXiv:0707.1520 · doi:10.1103/PhysRevA.76.053607
Abstract
We compute the shear viscosity of a superfluid atomic Fermi gas in the unitarity limit. The unitarity limit is characterized by a divergent scattering length between the atoms, and it has been argued that this will result in a very small viscosity. We show that in the low temperature T limit the shear viscosity scales as xi^5/T^5, where the universal parameter 'xi' relates the chemical potential and the Fermi energy, mu=xi E_F. Combined with the high temperature expansions of the viscosity our results suggest that the viscosity has a minimum near the critical temperature T_c. A naive extrapolation indicates that the minimum value of the ratio of viscosity over entropy density is within a factor of ~ 5 of the proposed lower bound hbar/(4πk_B).
9 pages, 7 figures, LaTeX2e
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Cited by in corpus (10)
- Many-Body Physics with Ultracold Gases
- Viscosity and scale invariance in the unitary Fermi gas
- The strongly coupled quark-gluon plasma created at RHIC
- Spin diffusion in Fermi gases
- Microscopic Approach to Shear Viscosities in Superfluid Gases: From BCS to BEC
- The axial anomaly and the phases of dense QCD
- The status of the KSS bound and its possible violations (How perfect can a fluid be?)
- Constraining phases of quark matter with studies of r-mode damping in neutron stars
- From Thermodynamics to the Bound on Viscosity
- Shear Viscosity in Weakly Coupled N-Component Scalar Field Theories