BCS-BEC crossover in a gas of Fermi atoms with a p-wave Feshbach resonance

TL;DR

This paper explores the BCS-BEC crossover in a Fermi gas with p-wave Feshbach resonance, analyzing how superfluidity transitions from Cooper pairing to molecular BEC, including fluctuation effects.

Contribution

It provides a theoretical calculation of the superfluid transition temperature considering p-wave interactions and fluctuations, revealing the continuous BCS-BEC crossover in this system.

Findings

Observation of continuous BCS-BEC crossover with p-wave pairing

Inclusion of fluctuations enhances the accuracy of transition temperature

Identification of three types of quasi-molecules with different angular momenta

Abstract

We investigate unconventional superfluidity in a gas of Fermi atoms with an anisotropic p-wave Feshbach resonance. Including the p-wave Feshbach resonance as well as the associated three kinds of quasi-molecules with finite orbital angular momenta $L_z=\pm1,0$, we calculate the transition temperature of the superfluid phase. As one passes through the p-wave Feshbach resonance, we find the usual BCS-BEC crossover phenomenon. The p-wave BCS state continuously changes into the BEC of bound molecules with L=1. Our calculation includes the effect of fluctuations associated with Cooper-pairs and molecules which are not Bose-condensed.