Superconductivity in type-II Weyl-semimetal WTe2induced by a normal metal contact

Artem Kononov, Martin Endres, Gulibusitan Abulizi, Kejian Qu, Jiaqiang Yan, David G. Mandrus, Kenji Watanabe, Takashi Taniguchi, Christian Schönenberger

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Abstract

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 WT e 2 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.

Original languageEnglish
Article number113903
JournalJournal of Applied Physics
Volume129
Issue number11
DOIs
StatePublished - Mar 21 2021

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