BCS-BEC crossover at finite temperature in spin-orbit coupled Fermi gases

Abstract

By adopting a $T$-matrix-based method within the $G_{0}G$ approximation for the pair susceptibility, we study the effects of the pairing fluctuation on the three-dimensional spin-orbit coupled Fermi gases at finite temperature. The critical temperatures of the superfluid/normal phase transition are determined for three different types of spin-orbit coupling (SOC): (1) the extreme oblate (EO) or Rashba SOC, (2) the extreme prolate (EP) or equal Rashba-Dresselhaus SOC, and (3) the spherical (S) SOC. For EO- and S-type SOC, the SOC dependence of the critical temperature signals a crossover from BCS to BEC state; at strong SOC limit, the critical temperature recover those of ideal BEC of rashbons. The pairing fluctuation induces a pseudogap in the fermionic excitation spectrum in both superfluid and normal phases. We find that, for EO- and S-type SOC, even at weak coupling, sufficiently strong SOC can induce sizable pseudogap. Our research suggests that the spin-orbit coupled Fermi gases may open new means to the study of the pseudogap formation in fermionic systems.

V2: 13 pages, 8 figures, more discussions added, matches published version

References in corpus (17)

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Cited by in corpus (15)

• Degenerate Quantum Gases with Spin-Orbit Coupling
• Anisotropic Weyl Fermions from Quasiparticle Excitation Spectrum of a 3D Fulde-Ferrell Superfluid
• When Superconductivity Crosses Over: From BCS to BEC
• Quantum Geometric Contributions to the BKT Transition: Beyond Mean Field Theory
• Scattering and effective interactions of ultracold atoms with spin-orbit coupling
• Signatures of pairing and spin-orbit coupling in correlation functions of Fermi gases
• Thermodynamic Properties of Rashba Spin-Orbit-Coupled Fermi Gas
• Proposed method to realize the $p$-wave superfluid state using a $s$-wave superfluid Fermi gas with a synthetic spin-orbit interaction
• Induced interactions in the BCS-BEC crossover of two-dimensional Fermi gases with Rashba spin-orbit coupling
• Reentrant Superfluidity and Pair Density Wave in Single Component Dipolar Fermi Gases
• Unusual destruction and enhancement of superfluidity of atomic Fermi gases by population imbalance in a one-dimensional optical lattice
• Fulde-Ferrell pairing instability of a Rashba spin-orbit coupled Fermi gas
• Fluctuation Theory of Rashba Fermi Gases
• Critical temperature in the BCS-BEC crossover with spin-orbit coupling
• Interaction-Range Effects and Universality in the BCS-BEC Crossover of Spin-Orbit Coupled Fermi Gases