• DOI:10.1103/PhysRevA.105.063304
• Corpus ID: 246411224

Superfluid transition temperature and fluctuation theory of spin-orbit- and Rabi-coupled fermions with tunable interactions

@article{Powell2022SuperfluidTT,
  title={Superfluid transition temperature and fluctuation theory of spin-orbit- and Rabi-coupled fermions with tunable interactions},
  author={P D Powell and Gordon Baym and Carlos A. R. S{\'a} de Melo},
  journal={Physical Review A},
  year={2022}
}

• P. Powell, G. Baym, C. A. R. Sá de Melo
• Published 27 January 2022
• Physics
• Physical Review A

We obtain the superfluid transition temperature of equal Rashba-Dresselhaus spin-orbitand Rabi-coupled Fermi superfluids, from the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensate (BEC) regimes in three dimensions for tunable s-wave interactions. In the presence of Rabi coupling, we find that spin-orbit coupling enhances (reduces) the critical temperature in the BEC (BCS) limit. For fixed interactions, we show that spin-orbit coupling can convert a first-order (discontinuous) phase transition into a second-order (continuous) phase transition, as a function of Rabi coupling. We derive the Ginzburg-Landau free energy to sixth power in the superfluid order parameter to describe both continuous and discontinuous phase transitions as a function of spin-orbit and Rabi couplings. Lastly, we develop a time-dependent Ginzburg-Landau fluctuation theory for an arbitrary mixture of Rashba and Dresselhaus spin-orbit couplings at any interaction strength.