Probing the many-body physics via measurement of the closed-channel fraction in a 6Li superfluid

ORAL

Abstract

Atomic Fermi gases provide an ideal platform for studying the pairing and superfluid physics, utilizing a Feshbach resonance between closed channel molecular states and open channel scattering states. The closed-channel fraction Z contains important many-body interacting effects. Here we probe the many-body physics of interacting Fermi gases of 6Li by measuring Z in the entire system. We have observed a significant departure from two-body physics. Away from
the deep BEC regime, the fraction Z is sensitive to the Fermi temperature TF. In particular, our data show Z∝ √TF at unitarity, in good agreement with theory. Further more, we have found a progressive departure of our measured Z value from theory as the system enters the BCS regime, calling for further investigation in both theory and experiment.

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Presenters

  • Xing-Can Yao

    Department of Modern Physics, University of Science and Technology of China

Authors

  • Qijin Chen

    Department of Physics, Zhejiang University, Zhejiang University

  • Xing-Can Yao

    Department of Modern Physics, University of Science and Technology of China

  • Xiang-Pei Liu

    Department of Modern Physics, University of Science and Technology of China

  • Hao-Ze Chen

    Department of Modern Physics, University of Science and Technology of China

  • Xiao-Qiong Wang

    Department of Modern Physics, University of Science and Technology of China

  • Yu-Xuan Wang

    Department of Modern Physics, University of Science and Technology of China

  • Yu-Ao Chen

    Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Department of Modern Physics, University of Science and Technology of China

  • Kathryn Levin

    James Franck Institute, University of Chicago, University of Chicago

  • Jian-Wei Pan

    Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Department of Modern Physics, University of Science and Technology of China