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

Abstract

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.

As accepted to Journal of Applied Physics, 7 pages, 4 figures

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• Type-II Weyl Semimetals
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Cited by in corpus (14)

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• Transparent Josephson Junctions in Higher-Order Topological Insulator WTe2 via Pd Diffusion
• Josephson junctions of Weyl semimetal ${\text{WTe}}_2$ induced by spontaneous nucleation of $\text{PdTe}$ superconductor
• Gate-defined Josephson weak-links in monolayer $\mathrm{WT}{\mathrm{e}}_2$
• Carrollian limit of quadratic gravity
• Uniqueness of Galilean and Carrollian limits of gravitational theories and application to higher derivative gravity
• Enhanced nonlinear Hall effect by Cooper pairs near superconductor criticality
• Carroll black holes in (A)dS and their higher-derivative modifications
• Majorana Flat Bands in the Vortex Line of Superconducting Weyl Semimetals
• Unveiling Topological Hinge States in the Higher-Order Topological Insulator WTe${}_2$ Based on the Fractional Josephson Effect
• Connection between the semiconductor--superconductor transition and the spin-polarized superconducting phase in the honeycomb lattice
• Interplay of Tilt and Axion Fields in Topological Superconductors: Anisotropy in the Meissner Effect
• Pre-Patterned Superconducting Contacts for Clean Superconductor-Topological Material Interfaces Enabling Long-Range Josephson Coupling