Effects of spin orbit coupling in superconducting proximity devices -- application to $\mathrm{CoSi_2 / TiSi_2}$ heterostructures

TL;DR

This paper investigates how interface-induced Rashba spin orbit coupling affects conductance in a three-terminal superconducting device, providing insights into unconventional superconductivity in CoSi2/TiSi2 heterostructures.

Contribution

It introduces a theoretical model incorporating Rashba spin orbit coupling effects on conductance, specifically applied to CoSi2/TiSi2 heterostructures with unconventional superconductivity.

Findings

Rashba spin orbit coupling significantly alters conductance spectra.

The model explains experimental conductance features observed in CoSi2/TiSi2.

Triplet-singlet pairing mixing is influenced by interface effects.

Abstract

Motivated by the recent findings of unconventional superconductivity in $\mathrm{CoSi_2 / TiSi_2}$ heterostructures, we study the effect of interface induced Rashba spin orbit coupling on the conductance of a three terminal "T" shape superconducting device. We calculate the differential conductance for this device within the quasi-classical formalism that includes the mixing of triplet-singlet pairing due to the Rashba spin orbit coupling. We discuss our result in the light of the conductance spectra reported by Chiu {\it et al.} for $\mathrm{CoSi_2 / TiSi_2}$ heterostructures.