Shear viscosity and spin diffusion coefficient of a two-dimensional Fermi gas

Abstract

Using kinetic theory, we calculate the shear viscosity and the spin diffusion coefficient as well as the associated relaxation times for a two-component Fermi gas in two dimensions, as a function of temperature, coupling strength, polarization, and mass ratio of the two components. It is demonstrated that the minimum value of the viscosity decreases with the mass ratio, since Fermi blocking becomes less efficient. We furthermore analyze recent experimental results for the quadrupole mode of a 2D gas in terms of viscous damping obtaining a qualitative agreement using no fitting parameters.

5 pages, 5 figures. Typos corrected and minor changes to the text in version 2

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• Viscosity spectral function of a scale invariant non-relativistic fluid from holography
• Microscopic derivation of the Boltzmann equation for transport coefficients of resonating fermions at high temperature
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• Collisionless spin dynamics in a magnetic field gradient
• Bulk viscosity of resonantly interacting fermions in the quantum virial expansion
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• Kovtun-Son-Starinets Conjecture and Effects of Mass Imbalance in the Normal State of an Ultracold Fermi Gas in the BCS-BEC Crossover Region
• Crossover from collisionless to collisional spin dynamics of polarized fermions
• Exact perturbative expansion of the transport coefficients of a normal low-temperature Fermi gas with contact interactions