Detection of BCS pairing in neutral Fermi fluids via Stokes scattering: the Hebel Slichter effect

TL;DR

This paper proposes a method to detect superfluidity in ultracold fermionic gases by observing a large maximum in Stokes scattering intensity below the critical temperature, analogous to the Hebel-Slichter effect in superconductors.

Contribution

It introduces a novel light scattering technique to identify the onset of BCS superfluidity in atomic gases, linking condensed matter phenomena with ultracold atom experiments.

Findings

Stokes scattering intensity peaks below the critical temperature

The effect serves as a clear indicator of superfluid transition

Analogous to the Hebel-Slichter effect in superconductors

Abstract

We consider the effects of superfluidity on the light scattering properties of a two component gas of fermionic atoms. It is demonstrated that the scattered intensity of the Stoke/anti Stokes lines exhibit a large maximum below the critical temperature when the gas is superfluid. This effect, which is the light scattering analogue of the famous Hebel-Slichter effect for conventional superconductors can be used to detect unambiguously the onset of superfluidity in an atomic gas in the BCS regime.