Spin 1/2 Fermions in the Unitary Regime at Finite Temperature

TL;DR

This paper presents a non-perturbative study of spin 1/2 fermions at unitarity, revealing a new superfluid phase and critical temperature, with unexpected thermodynamic features.

Contribution

It provides the first fully non-perturbative calculation of thermal properties and identifies a new superfluid classification in the BCS-BEC crossover.

Findings

Determined the critical temperature for superfluid transition.

Discovered unexpected thermodynamic behaviors.

Classified the system as a new type of superfluid.

Abstract

We have performed a fully non-perturbative calculation of the thermal properties of a system of spin 1/2 fermions in 3D in the unitary regime. We have determined the critical temperature for the superfluid-normal phase transition. The thermodynamic behavior of this system presents a number of unexpected features, and we conclude that spin 1/2 fermions in the BCS-BEC crossover should be classified as a new type of superfluid.