Atomistic modeling of a superconductor-transition-metal dichalcogenide-superconductor Josephson junction

TL;DR

This paper models a MoS2-based Josephson junction using atomistic tight-binding and Green's functions, revealing triplet correlations and spin-polarized states, with a method applicable to complex systems.

Contribution

It introduces a Green's function-based atomistic modeling approach for Josephson junctions with detailed material and scale considerations.

Findings

Presence of triplet superconducting correlations in MoS2 monolayers

Detection of spin-polarized subgap Andreev bound states

Method can be extended to other atomistic Josephson systems

Abstract

Using an atomistic tight-binding model, we study the characteristics of a Josephson junction formed by monolayers of MoS$_2$ sandwiched between Pb superconducting electrodes. We derive and apply Green's function-based formulation to compute the Josephson current in this system, as well as the local density of states in the junction. Our analysis of diagonal and off-diagonal components of the local density of states reveals the presence of triplet superconducting correlations in the MoS$_2$ monolayers and spin-polarized subgap (Andreev bound) states. Our formulation can be extended to other systems where atomistic details and large scales are needed to obtain accurate modeling of Josephson junction physics.