Topological superconductivity induced by a triple-Q magnetic structure

TL;DR

This paper shows that embedding a triple-Q magnetic structure in a magnet-superconductor hybrid system induces topological superconductivity, featuring chiral Majorana modes that are robust against various system parameters.

Contribution

It demonstrates that a triple-Q magnetic structure can induce topological superconductivity in hybrid systems, independent of layer alignment or magnetic layer electronic properties.

Findings

Chiral Majorana edge modes appear at domain walls.

Topological superconductivity is robust against layer alignment.

Majorana modes can be distinguished by supercurrent distribution.

Abstract

We demonstrate that the recently discovered triple-Q (3Q) magnetic structure, when embedded in a magnet-superconductor hybrid (MSH) system, gives rise to the emergence of topological superconductivity. We investigate the structure of chiral Majorana edge modes at domain walls, and show that they can be distinguished from trivial in-gap modes through the spatial distribution of the induced supercurrents. Finally, we show that topological superconductivity in 3Q MSH systems is a robust phenomenon that does not depend on the relative alignment of the magnetic and superconducting layers, or on the presence of electronic degrees of freedom in the magnetic layer.