Shear viscosity and spin diffusion in a two-dimensional Fermi gas

Understand

We investigate the temperature dependence of the shear viscosity and spin diffusion in a two-dimensional Fermi gas with contact interactions, as realized in ultra-cold atomic gases.

• We describe the transport coefficients in terms of a Boltzmann equation and present a full numerical solution for the degenerate gas.
• In contrast to previous works we take the medium effects due to finite density fully into account.
• This effect reduces the viscosity to entropy ratio, $\eta/s$, by a factor of three, and similarly for spin diffusion.