Strongly interacting Fermi gases with density imbalance

TL;DR

This paper investigates strongly interacting, density-imbalanced Fermi gases in the unitarity regime, analyzing phase separation and FFLO oscillations through Bogoliubov-deGennes equations and radio-frequency spectroscopy.

Contribution

It introduces a detailed theoretical analysis of phase separation and FFLO oscillations in density-imbalanced Fermi gases using Bogoliubov-deGennes equations.

Findings

Identification of phase separation in the system

Prediction of FFLO oscillations in the order parameter

Radio-frequency spectroscopy as a probe for these phenomena

Abstract

We consider density-imbalanced Fermi gases of atoms in the strongly interacting, i.e. unitarity, regime. The Bogoliubov-deGennes equations for a trapped superfluid are solved. They take into account the finite size of the system, as well as give rise to both phase separation and FFLO type oscillations in the order parameter. We show how radio-frequency spectroscopy reflects the phase separation, and can provide direct evidence of the FFLO-type oscillations via observing the nodes of the order parameter.