# The Noncollinear Path to Two-Dimensional Topological Superconductivity

## TL;DR

This paper shows that noncollinear magnetic structures can lead to topological superconductivity, offering new possibilities for quantum technologies.

## Contribution

The discovery of topological superconductivity in a noncollinear magnet-superconductor hybrid system.

## Key findings

- The system exhibits a topological nodal-point superconducting phase with low-energy edge modes.
- Edge modes show magnetization direction-dependent dispersion due to the noncollinear spin texture.
- A spatial shift of the magnetic spiral can reverse the chirality of an edge mode.

## Abstract

Two-dimensional magnet-superconductor hybrids (2D-MSH)
are promising
candidates to realize devices for topology-based quantum technologies
and superconducting spintronics. So far, studies have focused on 2D-MSH
systems with collinear ferro- or antiferromagnetic layers. Here, we
present the discovery of topological superconductivity in a noncollinear
MSH system where a magnetic spiral is realized in an Fe monolayer
proximity coupled to a superconducting Ta(110) substrate. By combining
low-temperature spin-polarized scanning tunneling spectroscopy with
an in-depth theoretical study, we can conclude that the system is
in a topological nodal-point superconducting phase with low-energy
edge modes. Furthermore, we reveal that for this noncollinear spin
texture, these edge modes exhibit a magnetization direction-dependent
dispersion. This means that a spatial shift of the magnetic spiral
could be used to reverse the chirality of an edge mode in future MSH-based
devices.