Ultracold two-component Fermi gases with a magnetic field gradient near a Feshbach resonance
Hongwei Xiong, Shujuan Liu, Weiping Zhang, Mingsheng Zhan
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.
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