Phase diagram of strongly-coupled Rashba systems

TL;DR

This paper explores the complex phase diagram of strongly-coupled Rashba systems, revealing how interlayer pairing, spin-orbit coupling, doping, and magnetic fields influence superconducting states and their symmetries.

Contribution

It provides a detailed numerical analysis of the interplay between various parameters affecting superconductivity in Rashba systems, including the discovery of multiple phase transitions.

Findings

Complex phase diagrams with multiple superconducting states

Transitions between states with different symmetries

Influence of magnetic field and doping on superconductivity

Abstract

Motivated by the recent discovery of a possible field-mediated parity switch within the superconducting state of CeRh2As2 [Khim et al., Science 373, 1012 (2021)], we thoroughly investigate the dependence of the superconducting state of a strongly-coupled Rashba mono- and bilayer on internal parameters and an applied magnetic field. The role of interlayer pairing, spin orbit coupling, doping rate and applied magnetic field and their interplay was examined numerically at low temperature within a t-J-like model, uncovering complex phase diagrams and transitions between superconducting states with different symmetry.