  WTe$_2$ is a material with rich topological properties: it is a 2D
topological insulator as a monolayer and a Weyl-semimetal and higher-order
topological insulator (HOTI) in the bulk form. Inducing superconductivity in
topological materials is a way to obtain topological superconductivity, which
lays at the foundation for many proposals of fault tolerant quantum computing.
Here, we demonstrate the emergence of superconductivity at the interface
between WTe$_2$ and the normal metal palladium. The superconductivity has a
critical temperature of about 1.2 K. By studying the superconductivity in
perpendicular magnetic field, we obtain the coherence length and the London
penetration depth. These parameters correspond to a low Fermi velocity and a
high density of states at the Fermi level. This hints to a possible origin of
superconductivity due to the formation of flat bands. Furthermore, the critical
in-plane magnetic field exceeds the Pauli limit, suggesting a non-trivial
nature of the superconducting state.
