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Phys Rev Lett. 2014 Jul 11;113(2):020406. Epub 2014 Jul 10.

Anomalous minimum in the shear viscosity of a Fermi gas.

Author information

1
Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA and Department of Physics, Duke University, Durham, North Carolina 27708, USA.
2
Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA.

Abstract

We measure the static shear viscosity η in a two-component Fermi gas near a broad collisional (Feshbach) resonance, as a function of interaction strength and energy. We find that η has both a quadratic and a linear dependence on the interaction strength 1/(k(FI)a), where a is the s-wave scattering length and k(FI) is the Fermi wave vector for an ideal gas at the trap center. For energies above the superfluid transition, the minimum in η as a function of interaction strength is significantly shifted toward the BEC side of resonance, to 1/(k(FI)a)≃0.25.

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