Ultracold two-component Fermi gases with a magnetic field gradient near a Feshbach resonance

TL;DR

This paper theoretically explores ultracold two-component Fermi gases under a magnetic field gradient near a Feshbach resonance, revealing coexistence of BCS, BEC, and unitarity regimes with observable density distribution features.

Contribution

It demonstrates how a magnetic field gradient can tune the scattering length to achieve coexistence of multiple quantum regimes in ultracold Fermi gases.

Findings

Coexistence of BCS, BEC, and unitarity regimes in the gas.

Double peak density distribution as evidence of coexistence.

Theoretical prediction applicable to current experimental setups.

Abstract

We study theoretically the ultracold two-component Fermi gases when a gradient magnetic field is used to tune the scattering length between atoms. For Li6 at the narrow resonance B0=543.25G, it is shown that the gases would be in a coexistence of the regimes of BCS, BEC and unitarity limit with the present experimental technique. In the case of thermal and chemical equilibrium, we investigate the density distribution of the gases and show that a double peak of the density distribution can give us a clear evidence for the coexistence of BCS, BEC and unitarity limit.