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

Abstract

We extract the shear viscosity to entropy density ratio η/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 η/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/(4π) than any other known liquid.

published version

References in corpus (7)

• Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Critical Temperature and Thermodynamics of Attractive Fermions at Unitarity
• Precision Measurements of Collective Oscillations in the BEC-BCS Crossover
• Measurement of the Entropy and Critical Temperature of a Strongly Interacting Fermi Gas
• Shear viscosity and damping for a Fermi gas in the unitarity limit
• Spin 1/2 Fermions in the Unitary Regime at Finite Temperature

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