Josephson junctions of Weyl semimetal WTe2 induced by spontaneous nucleation of PdTe superconductor
Abstract
We report on the fabrication of Josephson junction devices with weak links utilizing the Weyl and higher-order topological semimetal WTe2. We show that WTe2/Pd contact annealed at a low temperature of 80C did not exhibit superconducting properties because neither WTe2 nor Pd are superconductors in the ground state. Upon 180C annealing, spontaneous formation of superconducting PdTe due to Pd diffusion enabled us to obtain the interface between WTe2 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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