Mechanisms for Magnetic Skyrmion Catalysis and Topological Superconductivity

Abstract

We propose an alternative route to stabilize magnetic skyrmion textures which does not require Dzyaloshinkii-Moriya interaction, magnetic anisotropy, or an external Zeeman field. Instead, it solely relies on the emergence of flux in the system's ground state. We discuss scenarios that lead to a nonzero flux, and identify the magnetic skyrmion ground states which become accessible in its presence. Moreover, we explore the chiral superconductors obtained for the surface states of a topological crystalline insulator when two types of magnetic skyrmion crystals coexist with a pairing gap. Our work opens perspectives for engineering topological superconductivity in a minimal fashion, and promises to unearth functional topological materials and devices which may be more compatible with electrostatic control than the currently explored skyrmion-Majorana platforms.

arXiv comment24 pages, 9 figures, 2 tables. Updated abstract, acknowledgements and funding info; improved the quality of the existing figures; added a few new references and explanations. Version close to the published one

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• Topological phase transitions in superconductors with chiral symmetry
• New mechanisms to engineer magnetic skyrmions and topological superconductors