2015/08/07 by T. Yamaguchi, D. Inotani, Y. Ohashi
Physics and Astronomy · #Advanced Condensed Matter Physics #Antisymmetric relation #Bound state #Cold Atom Physics and Bose-Einstein Condensates #Coupling (piping) #Fermi Gamma-ray Space Telescope #Fermi gas #Pairing #Pauli exclusion principle #Physics of Superconductivity and Magnetism #Quasiparticle #Superfluidity #cond-mat.quant-gas
paper · pdf · doi:10.1007/s10909-016-1558-0
published as Journal of Low Temperature Physics 183, 161 (2016) · 7 pages, 3 figues, proceedings of the international symposium on Quantum Fluids and Solids QFS2015
arxiv created 2015/08/07 · openalex publication_date 2016/03/03 · openalex created_date 2016/06/24 · arxiv updated 2018/07/05 · openalex updated_date 2026/08/05
We investigate the formation of rashbon bound states and strong-coupling effects in an ultracold Fermi gas with a spherical spin-orbit interaction, H\rm so=λ\bf p⋅\bf σ (where \bf σ=(σx,σy,σz) 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\rm c, as functions of the strength of a pairing interaction Us, as well as the spin-orbit coupling strength λ. 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 Us-λ phase diagram. Since the antisymmetric spin-orbit interaction H\rm 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.