Probing pairing gap in Fermi atoms by light scattering

TL;DR

This paper investigates how light scattering can be used to measure the pairing gap in a superfluid Fermi gas of atoms, providing a potential experimental method for probing superfluid properties.

Contribution

It introduces a theoretical framework for using light scattering and Bragg spectroscopy to detect the pairing gap in trapped Fermi gases, considering final state interactions.

Findings

Response function calculated within Nambu-Gorkov formalism

Dynamic structure factor linked to pairing gap detection

Model suggests Bragg spectroscopy can observe the pairing gap

Abstract

We study stimulated scattering of polarized light in a two-component Fermi gas of atoms at zero temperature. Within the framework of Nambu-Gorkov formalism, we calculate the response function of superfluid gas taking into account the final state interactions. The dynamic structure factor deduced from the response function provides information about the pairing gap and the momentum distributions of atoms. Model calculations using local density approximation indicates that the pairing gap of trapped Fermi gas may be detectable by Bragg spectroscopy due to stimulated scattering.