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Magnetic Properties and Strong-Coupling Corrections in an Ultracold Fermi Gas with Population Imbalance

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Abstract

We investigate magnetic properties of an ultracold Fermi gas with population imbalance. In the presence of population imbalance, the strong-coupling theory developed by Nozières and Schmitt-Rink (which is frequently referred to as the NSR theory, or Gaussian fluctuation theory) is known to give unphysical results in the BCS-BEC crossover region. We point out that this problem comes from how to treat pseudogap effects originating from pairing fluctuations and many-body corrections to the spin susceptibility. We also clarify how to overcome this problem by including higher order fluctuations beyond the ordinary T-matrix approximation. Calculated spin susceptibility based on our extended T-matrix approximation agrees well with the recent experiment on a 6Li Fermi gas.

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Acknowledgements

We would like to thank S. Watabe, Y. Endo, D. Inotani, and R. Hanai for useful discussions. Y.O. was supported by Grant-in-Aid for Scientific research from MEXT in Japan (22540412, 23104723, 23500056).

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Authors and Affiliations

  1. Department of Physics, Keio University, Yokohama, 223-8522, Japan

    T. Kashimura, R. Watanabe & Y. Ohashi

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  1. T. Kashimura
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  2. R. Watanabe
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  3. Y. Ohashi
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Correspondence to T. Kashimura.

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Kashimura, T., Watanabe, R. & Ohashi, Y. Magnetic Properties and Strong-Coupling Corrections in an Ultracold Fermi Gas with Population Imbalance. J Low Temp Phys 171, 355–361 (2013). https://doi.org/10.1007/s10909-012-0724-2

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  • DOI: https://doi.org/10.1007/s10909-012-0724-2

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