Stability of trapped fermionic gases with attractive interactions

TL;DR

This paper reviews the stability of trapped fermionic gases with attractive interactions across different regimes, highlighting their inherent stability unlike bosonic systems, and discussing conditions leading to potential instability.

Contribution

It provides a unified overview from mean-field to unitarity regimes, emphasizing the stability properties of fermionic gases with short-range attractions.

Findings

Fermionic gases are always stable in mean-field and unitarity regimes.

Instability can occur when interparticle spacing approaches interaction range.

Contrasts stability behavior with bosonic systems.

Abstract

We present a unified overview, from the mean-field to the unitarity regime, of the stability of a trapped Fermi gas with short range attractive interactions. Unlike in a system of bosons, a Fermi gas is always stable in these regimes, no matter how large the particle number. However, when the interparticle spacing becomes comparable to the range of the interatomic interactions, instability is not precluded.