Superconductivity without Local Inversion Symmetry; Multi-layer Systems

TL;DR

This paper investigates how local inversion symmetry breaking in multi-layer systems influences superconductivity, especially focusing on antisymmetric spin-orbit coupling (ASOC) effects on spin susceptibility at zero temperature.

Contribution

It introduces a theoretical analysis of superconductivity in multi-layer systems with spatially modulated ASOC and explores the impact on spin susceptibility and mixed parity order parameters.

Findings

Enhanced spin susceptibility due to ASOC at weak inter-layer coupling

Potential significance of ASOC in superconducting phase stability

Insights into spatially modulated antisymmetric spin-orbit effects

Abstract

While multi-layer systems can possess global inversion centers, they can have regions with locally broken inversion symmetry. This can modify the superconducting properties of such a system. Here we analyze two dimensional multi-layer systems yielding spatially modulated antisymmetric spin-orbit coupling (ASOC) and discuss superconductivity with mixed parity order parameters. In particular, the influence of ASOC on the spin susceptibility is investigated at zero temperature. For weak inter-layer coupling we find an enhanced spin susceptibility induced by ASOC, which hints the potential importance of this aspect for superconducting phase in specially structured superlattices.