Imbalanced Feshbach-resonant Fermi gases

TL;DR

This paper reviews recent progress in understanding imbalanced Feshbach-resonant Fermi gases, focusing on their phase diagrams, instabilities, and comparison with experiments across the BEC-BCS crossover.

Contribution

It provides a comprehensive overview of theoretical models, phase behavior, and experimental findings related to polarized Feshbach-resonant Fermi gases.

Findings

Identification of phase separation and FFLO states

Analysis of superfluid instabilities across the BEC-BCS crossover

Comparison of theoretical predictions with experimental data

Abstract

We present an overview of recent developments in species-imbalanced ("polarized") Feshbach-resonant Fermi gases. We summarize the current status of thermodynamics of these systems in terms of a phase diagram as a function of the Feshbach resonance detuning, polarization and temperature. We review instabilities of the s-wave superfluidity across the BEC-BCS crossover to phase separation, FFLO states, polarized molecular superfluidity and the normal state, driven by the species imbalance. We discuss different models and approximations of this system and compare their predictions to current experiments.