Spin-Orbit Coupling in Multilayer Superconductors with Charge Imbalance

TL;DR

This paper explores how charge imbalance affects spin susceptibility in multilayer superconductors with layer-dependent Rashba spin-orbit coupling, revealing significant layer-dependent effects especially under weak spin-orbit coupling conditions.

Contribution

It demonstrates that charge imbalance induces strong layer dependence in spin susceptibility, contrasting with uniform charge distribution scenarios in multilayer superconductors.

Findings

Charge imbalance causes pronounced layer dependence in susceptibility.

Weak spin-orbit coupling enhances layer-specific effects.

Results are relevant for high-Tc cuprates and superlattice superconductors.

Abstract

In this study, we investigate the spin susceptibility in the superconducting state of a multilayer system with a layer-dependent Rashba spin-orbit coupling, representing a locally non-centrosymmetric superconductor. We show that the charge imbalance between different layers yields a strong layer dependence on the susceptibility, most significantly for a weak spin-orbit coupling, which is in contrast to a situation with an equally distributed charge. These results can be relevant for experimental test in multilayer high-Tc cuprates as well as in superconducting CeCoIn5/YbCoIn5 superlattices with more than two layers.