Spin Susceptibility and Effects of Inhomogeneous Strong Pairing Fluctuations in a Trapped Ultracold Fermi Gas

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• 作者：H. Tajima ; R. Hanai ; Y. Ohashi
• 关键词：Fermi superfluid ; Spin gap ; Strong ; coupling effects ; BCS–BEC crossover
• 刊名：Journal of Low Temperature Physics
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：183
• 期：3-4
• 页码：175-182
• 全文大小：468 KB
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• 作者单位：H. Tajima (1)
  R. Hanai (1)
  Y. Ohashi (1)
  
  1. Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Characterization and Evaluation Materials
  Magnetism and Magnetic Materials
  
• 出版者：Springer Netherlands
• ISSN：1573-7357

文摘

We theoretically investigate magnetic properties of a unitary Fermi gas in a harmonic trap. Including strong pairing fluctuations within the framework of an extended T-matrix approximation, as well as effects of a trap potential within the local density approximation, we calculate the local spin susceptibility \(\chi (T,r)\) above the superfluid phase transition temperature \(T_\mathrm{c}\). We show that the formation of preformed singlet Cooper pairs anomalously suppresses \(\chi (T,r)\) in the trap center near \(T_\mathrm{c}\). We also point out that, in the unitarity limit, the spin-gap temperature in a uniform Fermi gas can be evaluated from the observation of the spatial variation of \(\chi (T,r)\). Since a real ultracold Fermi gas is always in a trap potential, our results would be useful for the study of how this spatial inhomogeneity affects thermodynamic properties of an ultracold Fermi gas in the BCS–BEC crossover region.