Energy absorption spectroscopy of unitary Fermi gases in a uniform potential

TL;DR

This paper introduces a method using energy absorption spectroscopy to measure kinetic coefficients like shear viscosity and thermal conductivity in unitary Fermi gases within a uniform potential, linking the spectrum to the system's dynamic structure factor.

Contribution

It proposes a novel spectroscopy-based approach to directly determine kinetic coefficients in unitary Fermi gases, facilitating experimental extraction of these properties.

Findings

Spectrum proportional to dynamic structure factor

Extraction of viscosity and conductivity coefficients feasible

Method applicable with current experimental setups

Abstract

We propose to use the energy absorption spectroscopy to measure the kinetic coefficients of unitary Fermi gases in a uniform potential. We show that in our scheme, the energy absorption spectrum is proportional to the dynamic structure factor of the system. The profile of the spectrum depends on the shear viscosity $\eta$, the thermal conductivity $\kappa$ and the superfluid bulk viscosity $\xi_3$. We show that extraction of these coefficients from the spectrum is achievable in present experiments.