Evidence of Interfacial Topological Superconductivity on the Topological Semimetal Tungsten Carbide Induced by Metal Deposition

Abstract

Interfaces between materials with different electronic ground states have become powerful platforms for creating and controlling novel quantum states of matter, in which inversion symmetry breaking and other effects at the interface may introduce additional electronic states. Among the emergent phenomena, superconductivity is of particular interest. In this work, by depositing metal films on a newly identified topological semimetal tungsten carbide (WC) single crystal, we have obtained interfacial topological superconductivity evidenced from soft point contact spectroscopy. This very robust phenomenon has been demonstrated for a wide range of Metal/WC interfaces, involving both non-magnetic and ferromagnetic films, and the superconducting transition temperatures is surprisingly insensitive to the magnetism of thin films, suggesting a spin-triplet pairing superconducting state. The results offer an opportunity to implement topological superconductivity using convenient thin film coating method.

arXiv comment27 pages, 4 figures

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Cited by in corpus (6)

• Superconductivity in type-II Weyl-semimetal WTe2 induced by a normal metal contact
• Experimental search for the origin of low-energy modes in topological materials
• Electron-phonon interaction and point contact enhanced superconductivity in trigonal PtBi2
• Observation of surface superconductivity in a three-dimensional Dirac material
• Strong electron-phonon coupling in 3D tungsten nitride and coexistence of intrinsic superconductivity and topological nodal line in its 2D limit
• Formation of tungsten carbide by focused ion beam process: A route to high magnetic field resilient patterned superconducting nanostructures