Rabi coupled fermions in the BCS-BEC crossover

TL;DR

This paper explores how Rabi coupling influences the BCS-BEC crossover in fermionic systems, affecting key properties like chemical potential, pairing gap, and superfluid transition temperature.

Contribution

It provides a detailed analysis of the impact of Rabi coupling on the BCS-BEC crossover, including the determination of the critical interaction strength and effects on phase transition temperatures.

Findings

Rabi coupling significantly alters the chemical potential and pairing gap.

Identified the critical interaction strength for the normal phase at zero temperature.

Calculated the Rabi coupling's effect on the superfluid transition temperature.

Abstract

We investigate the three-dimensional BCS-BEC crossover in the presence of a Rabi coupling which strongly affects several properties of the system, such as the chemical potential, the pairing gap and the superfluid density. We determine the critical interaction strength, below which the system is normal also at zero temperature. Finally, we calculate the effect of the Rabi coupling on the critical temperature of the superfluid-to-normal phase transition by using different theoretical schemes.