Understanding the superfluid phase diagram in trapped Fermi gases

TL;DR

This paper analyzes experimental data on ultracold Fermi gases to map the superfluid phase diagram across BCS-BEC regimes, showing good agreement with theoretical predictions.

Contribution

It provides a detailed comparison between experimental phase boundary data and theoretical models in trapped Fermi gases.

Findings

Experimental phase boundary data aligns well with theoretical phase diagrams.

Demonstrates the tunability of superfluid phases in ultracold Fermi gases.

Validates the sweep technique for probing superfluid transitions.

Abstract

Trapped ultracold Fermi gases provide a system that can be tuned between the BCS and BEC regimes by means of a magnetic-field Feshbach resonance. Condensation of fermionic atom pairs in a $^{40}$K gas was demonstrated experimentally by a sweep technique that pairwise projects fermionic atoms onto molecules. In this paper we examine previous data obtained with this technique that probed the phase boundary in the temperature-magnetic field plane. Comparison of the $^{40}$K data to a theoretically computed phase diagram demonstrates good agreement between the two.