Topological Superconductivity Mediated by Skyrmionic Magnons

TL;DR

This paper demonstrates that skyrmion crystal-induced spin fluctuations can mediate topological superconductivity at interfaces with normal metals, revealing a new pathway for realizing Majorana states.

Contribution

It introduces a novel mechanism where skyrmionic magnons induce topological superconductivity through interfacial exchange coupling.

Findings

Topological superconductivity can be mediated by skyrmion-induced spin fluctuations.

The noncolinear magnetic ground state leads to unique electron-electron interactions.

Superconductivity is demonstrated both near critical temperature and at zero temperature.

Abstract

Topological superconductors are associated with the appearance of Majorana bound states, with promising applications in topologically protected quantum computing. In this Letter, we study a system where a skyrmion crystal is interfaced with a normal metal. Through interfacial exchange coupling, spin fluctuations in the skyrmion crystal mediate an effective electron-electron interaction in the normal metal. We study superconductivity within a weak-coupling approach and solve gap equations both close to the critical temperature and at zero temperature. Special features in the effective electron-electron interaction due to the noncolinearity of the magnetic ground state yield topological superconductivity at the interface.