Observation of the density dependence of the closed-channel fraction of a ⁶Li superfluid.

ABSTRACT: Atomic Fermi gases provide an ideal platform for studying pairing and superfluid physics, using a Feshbach resonance between closed-channel molecular states and open-channel scattering states. Of particular interest is the strongly interacting regime. We show that the closed-channel fraction [Formula: see text] provides an effective probe for important many-body interacting effects, especially through its density dependence, which is absent from two-body theoretical predictions. Here we measure [Formula: see text] as a function of interaction strength and the Fermi temperature [Formula: see text] in a trapped ⁶Li superfluid throughout the entire Bardeen-Cooper-Schrieffer-Bose-Einstein-condensate crossover, in quantitative agreement with theory when important thermal contribution

SUBMITTER: Liu XP 

PROVIDER: S-EPMC9665308 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature