Quantum mechanics

Fermi level

Quantum oscillations

Pauli exclusion principle

Band gap

Physics

Fermi surface

Mathematics

Topological insulator

Fermi energy

Semimetal

Superconductivity

Superconducting coherence length

Condensed matter physics

Combinatorics

London penetration depth

Electron

Topology (electrical circuits)

Coherence length

Critical field

Weyl semimetal

Journal of Applied Physics

WT e 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 in a 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 WTe2 and the normal metal palladium. The superconductivity has a critical temperature of about 1.2 K. By studying the superconductivity in a 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 flatbands. Furthermore, the critical in-plane magnetic field exceeds the Pauli limit, suggesting a non-trivial nature of the superconducting state.

Superconductivity in type-II Weyl-semimetal WTe2 induced by a normal metal contact