Quantum oscillations in ultracold Fermi gases : realizations with rotating gases or artificial gauge fields

TL;DR

This paper investigates quantum oscillations in the angular momentum of ultracold Fermi gases under rotation or artificial gauge fields, proposing experimental methods and their potential as a low-temperature thermometer.

Contribution

It demonstrates the presence of de Haas-van Alphen-like oscillations in ultracold Fermi gases and analyzes their dependence on physical parameters and temperature.

Findings

Oscillations in angular momentum as a function of particle number or chemical potential.

Proposed experimental protocols for observing these oscillations.

Oscillation amplitude's strong temperature dependence as a potential thermometer.

Abstract

We consider the angular momentum of a harmonically trapped, noninteracting Fermi gas subject to either rotation or to an artificial gauge field. The angular momentum of the gas is shown to display oscillations as a function of the particle number or chemical potential. This phenomenon is analogous to the de Haas - van Alphen oscillations of the magnetization in the solid-state context. However, key differences exist between the solid-state and ultracold atomic gases that we point out and analyze. We explore the dependence of the visibility of these oscillations on the physical parameters and propose two experimental protocols for their observation. Due to the very strong dependence of the amplitude of the oscillations on temperature, we propose their use as a sensitive thermometer for Fermi gases in the low temperature regime.