Spin-susceptibility of spin-orbit coupled Fermi superfluids

Abstract

Under the self-consistent mean-field approach for the BCS-BEC crossover problem, we derive a closed-form analytical expression for the general spin response of noncentrosymmetric Fermi superfluids with arbitrary spin-orbit coupling and Zeeman fields. In addition to the paramagnetic, i.e., the Pauli intra-helicity and Van Vleck type inter-helicity, contributions to the spin-susceptibility tensor that have normal-state counterparts, we identify a diamagnetic inter-helicity contribution that is unique to the superfluid state. Our extensive numerical calculations for the Weyl, Rashba and equal Rashba-Dresselhaus spin-orbit couplings illustrate that it is this diamagnetic contribution that grows gradually with pairing and cancels precisely the Van Vleck contribution away from the BCS regime in general.

6 pages with 2 figures; to appear in PRA

References in corpus (4)

• Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
• On the spin susceptibility of noncentrosymmetric superconductors
• Quantum metric contribution to the pair mass in spin-orbit coupled Fermi superfluids
• Exposing the quantum geometry of spin-orbit coupled Fermi superfluids

Cited by in corpus (5)

• Light-matter coupling and quantum geometry in moiré materials
• Exposing the quantum geometry of spin-orbit coupled Fermi superfluids
• Quantum geometry encoded to pair potentials
• Geometric mass acquisition via quantum metric: an effective band mass theorem for the helicity bands
• Drude weight and the many-body quantum metric in one-dimensional Bose systems