Topological Superconductivity Mediated by Skyrmionic Magnons.

Area of Science:

• Condensed Matter Physics
• Quantum Computing

Background:

• Topological superconductors are key for realizing Majorana bound states.
• These states have potential applications in topologically protected quantum computing.

Purpose of the Study:

• Investigate the emergence of topological superconductivity at the interface between a skyrmion crystal and a normal metal.
• Understand the role of interfacial exchange coupling and spin fluctuations.

Main Methods:

• Utilized a weak-coupling approach to study superconductivity.
• Solved gap equations near the critical temperature and at zero temperature.
• Analyzed the effects of magnetic ground state noncollinearity on electron-electron interactions.

Main Results:

• Interfacial exchange coupling between skyrmion crystal and normal metal induces effective electron-electron interactions.
• Noncollinear magnetic structures in the skyrmion crystal lead to unique features in the induced interaction.
• These features result in the formation of topological superconductivity at the interface.

Conclusions:

• Skyrmion crystal-normal metal interfaces can host topological superconductivity.
• The mechanism relies on spin fluctuations mediating interactions, driven by magnetic noncollinearity.
• This work provides a pathway for engineering topological superconductivity for quantum technologies.