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Strong-Coupling Theory for a Non-equilibrium Unitary Fermi Gas

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Abstract

We study a non-equilibrium unitary Fermi gas, being coupled with two baths with different values of chemical potential. Extending a T-matrix approximation developed in equilibrium Fermi gases to the non-equilibrium steady state by using the Keldysh Green’s function technique, we examine the superfluid phase transition out of equilibrium. We also clarify non-equilibrium effects on the pseudogap phenomenon by strong pairing fluctuations.

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Acknowledgements

We thank D. Inotani and K. Furutani for discussions. RH was supported by a Grand-in-Aid for JSPS fellows (No. 17J01238). YO was supported by a Grant-in-aid for Scientific Research from MEXT and JSPS in Japan (No. JP18K11345, No. JP18H05406, and No. JP19K03689).

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Authors and Affiliations

  1. Department of Physics, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan

    T. Kawamura, D. Kagamihara & Y. Ohashi

  2. Department of Physics, James Franck Institute, University of Chicago, Chicago, IL, 60637, USA

    R. Hanai

  3. Department of Physics, Osaka University, Toyonaka, 560-0043, Japan

    R. Hanai

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  1. T. Kawamura
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  2. D. Kagamihara
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  3. R. Hanai
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  4. Y. Ohashi
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Correspondence to T. Kawamura.

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Kawamura, T., Kagamihara, D., Hanai, R. et al. Strong-Coupling Theory for a Non-equilibrium Unitary Fermi Gas. J Low Temp Phys 201, 41–48 (2020). https://doi.org/10.1007/s10909-019-02310-7

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  • DOI: https://doi.org/10.1007/s10909-019-02310-7

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