Rashbon Bound States Associated with a Spherical Spin–Orbit Coupling in an Ultracold Fermi Gas with an s-Wave Interaction

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• 作者：T. Yamaguchi ; D. Inotani ; Y. Ohashi
• 关键词：Ultracold Fermi gas ; Spin–orbit coupling ; BCS–BEC crossover ; Rashbon
• 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：161-168
• 全文大小：721 KB
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• 作者单位：T. Yamaguchi (1)
  D. Inotani (1)
  Y. Ohashi (1)
  
  1. Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama, Kohoku-ku, 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 investigate the formation of rashbon bound states and strong-coupling effects in an ultracold Fermi gas with a spherical spin–orbit interaction, \(H_\mathrm{so}=\lambda {\varvec{p}}\cdot \mathbf{\sigma }\) (where \(\mathbf{\sigma }=(\sigma _x,\sigma _y,\sigma _z)\) are Pauli matrices). Extending the strong-coupling theory developed by Nozières and Schmitt-Rink (NSR) to include this spin–orbit coupling, we determine the superfluid phase transition temperature \(T_\mathrm{c}\), as functions of the strength of a pairing interaction \(U_s\), as well as the spin–orbit coupling strength \(\lambda \). Evaluating poles of the NSR particle–particle scattering matrix describing fluctuations in the Cooper channel, we clarify the region where rashbon bound states dominate the superfluid phase transition in the \(U_s\)–\(\lambda \) phase diagram. Since the antisymmetric spin–orbit interaction \(H_\mathrm{so}\) breaks the inversion symmetry of the system, rashbon bound states naturally have not only a spin-singlet and even-parity symmetry, but also a spin-triplet and odd-parity symmetry. Thus, our results would be also useful for the study of this parity-mixing effect in the BCS–BEC crossover regime of a spin–orbit coupled Fermi gas.