High Temperature Superfluid and Feshbach Resonance

TL;DR

This paper develops an effective field theory for cold fermionic atoms near a Feshbach resonance, revealing a superfluid condensate of order the Fermi energy and a critical temperature approximately 43% of the Fermi temperature.

Contribution

It provides a unique theoretical description of superfluidity in cold fermionic gases near Feshbach resonances, especially at the resonance condition where the resonance energy matches twice the Fermi surface energy.

Findings

Superfluid condensate is of order the Fermi energy.

Critical temperature is approximately 0.43 times the Fermi temperature.

Effective field theory accurately describes the dynamics near the Feshbach resonance.

Abstract

We study an effective field theory describing cold fermionic atoms near a Feshbach resonance. The theory gives a unique description of the dynamics in the limit that the energy of the Feshbach resonance is tuned to be twice that of the Fermi surface. We show that in this limit the zero temperature superfluid condensate is of order the Fermi energy, and obtain a critical temperature $T_C \simeq 0.43 T_F$