Yu-Shiba-Rusinov States in Ising Superconductors

TL;DR

This paper theoretically investigates Yu-Shiba-Rusinov states in Ising superconductors, revealing how magnetic impurities can probe their unconventional pairing structure through distinctive spectral features.

Contribution

It introduces a theoretical analysis of magnetic impurity-induced bound states as a novel method to characterize Ising superconductivity in two-dimensional materials.

Findings

Distinct spectral features differentiate Ising superconductors from conventional ones.

Magnetic impurities serve as sensitive probes of the superconducting pairing structure.

The study provides experimentally accessible signatures of unconventional superconductivity.

Abstract

The nature of the superconducting state in two-dimensional transition-metal dichalcogenides remains under active debate. A widely used description invokes so-called Ising superconductivity. In this work, we investigate theoretically this pairing state by employing single magnetic impurities as local probes of the superconducting condensate. We analyze the formation of Yu-Shiba-Rusinov bound states in the presence of Ising spin-orbit coupling and an in-plane magnetic field to study how their spectral properties encode the underlying pairing structure. We identify distinct features in the bound-state spectrum and tunneling response that differentiate this system from conventional superconductors. Our results demonstrate that magnetic impurities provide a sensitive probe of the structure of the superconducting state and yield experimentally accessible signatures of unconventional aspects of Ising superconductivity.