Josephson junctions of Weyl semimetal ${\text{WTe}}_2$ induced by spontaneous nucleation of $\text{PdTe}$ superconductor

Abstract

We report on the fabrication of Josephson junction devices with weak links utilizing the Weyl and higher-order topological semimetal ${\text{WTe}}_2$. We show that ${\text{WTe}}_2\text{/Pd}$ contact annealed at a low temperature of 80°C did not exhibit superconducting properties because neither ${\text{WTe}}_2$ nor Pd are superconductors in the ground state. Upon 180°C annealing, spontaneous formation of superconducting $\text{PdTe}$ due to Pd diffusion enabled us to obtain the interface between ${\text{WTe}}_2$ and superconductor suitable for the Josephson junction. This result is a facile technique to make a Josephson junction and induce Cooper pairs into topological telluride semimetals.

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Cited by in corpus (7)

• Surface-Confined Two-Dimensional Crystal Growth on a Monolayer
• Transparent Josephson Junctions in Higher-Order Topological Insulator WTe2 via Pd Diffusion
• Gate-defined Josephson weak-links in monolayer $\mathrm{WT}{\mathrm{e}}_2$
• Crystalline superconductor-semiconductor Josephson junctions for compact superconducting qubits
• Nature of Andreev bound states in Josephson junctions of triple-point semimetals
• Probing the topological protection of edge states in multilayer tungsten ditelluride with the superconducting proximity effect
• Emergent One-Dimensional Helical Channel in Higher-Order Topological Insulators with Step Edges