Engineering nodal topological phases in Ising superconductors by magnetic superstructures

Abstract

Recently it was discovered that superconductivity in transition metal dichalcogenides (TMDs) is strongly affected by an out-of-plane spin-orbit coupling (SOC). In addition, new techniques of fabricating 2d ferromagnets on van der Waals materials are rapidly emerging. Combining these breakthroughs, we propose a realization of nodal topological superconductivity in TMDs by fabricating nanostructured ferromagnets with an in-plane magnetization on the top surface. The proposed procedure does not require application of external magnetic fields and applies to monolayer and multilayer (bulk) systems. The signatures of the topological phase include Majorana flat bands that can be directly observed by Scanning Tunneling Microscopy (STM) techniques. We concentrate on NbSe${}_2$ and argue that the proposed structures demonstrating the nodal topological phase can be realized withing existing technology.

arXiv comment8 pages, 7 figures

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Cited by in corpus (11)

• Ising superconductivity and magnetism in NbSe${}_2$
• Yu-Shiba-Rusinov states in the charge-density modulated superconductor NbSe2
• Yu-Shiba-Rusinov states in real metals
• Magnetism-driven unconventional effects in Ising superconductors: role of proximity, tunneling, and nematicity
• Topological superconductivity in EuS/Au/superconductor heterostructures
• Topological Interlayer Superconductivity in a van der Waals Heterostructure
• Ising superconductivity in noncentrosymmetric bulk NbSe2
• Effects of electron-electron interactions in the Yu-Shiba-Rusinov lattice model
• Three-orbital continuous model for $1H$-type metallic transition-metal dichalcogenide monolayers
• Identification of the Majorana edge modes in tight-binding systems based on the Krylov method
• Josephson junctions of topological nodal superconductors