  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.
