Collisional Properties of a Polarized Fermi Gas with Resonant Interactions

TL;DR

This paper investigates the thermodynamic and collisional properties of a highly polarized resonant Fermi gas, providing insights into quasiparticle interactions and spin mode damping relevant for current experiments.

Contribution

It introduces a method to calculate quasiparticle scattering amplitudes from thermodynamic data in resonant Fermi gases and applies it to analyze spin dipole mode damping.

Findings

Spin dipole mode damping is intermediate between hydrodynamic and collisionless regimes.

Thermodynamic properties can inform quasiparticle scattering in resonant Fermi gases.

The results are applicable to current experimental conditions.

Abstract

Highly polarized mixtures of atomic Fermi gases constitute a novel Fermi liquid. We demonstrate how information on thermodynamic properties may be used to calculate quasiparticle scattering amplitudes even when the interaction is resonant and apply the results to evaluate the damping of the spin dipole mode. We estimate that under current experimental conditions, the mode would be intermediate between the hydrodynamic and collisionless limits.