Bulk and surface states carried supercurrent in ballistic Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions

Abstract

A three-dimensional Dirac semimetal has bulk Dirac cones in all three momentum directions and Fermi arc-like surface states, and can be converted into a Weyl semimetal by breaking time-reversal symmetry. However, the highly conductive bulk state usually hides the electronic transport from the surface state in Dirac semimetal. Here, we demonstrate the supercurrent carried by bulk and surface states in Nb-Cd3As2 nanowire-Nb short and long junctions, respectively. For the 1 micrometer long junction, the Fabry-Perot interferences induced oscillations of the critical supercurrent are observed, suggesting the ballistic transport of the surface states carried supercurrent, where the bulk states are decoherent and the topologically protected surface states still keep coherent. Moreover, a superconducting dome is observed in the long junction, which is attributed to the enhanced dephasing from the interaction between surface and bulk states as tuning gate voltage to increase the carrier density. The superconductivity of topological semimetal nanowire is promising for braiding of Majorana fermions toward topological quantum computing.

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• Reducing electronic transport dimension to topological hinge states by increasing geometry size of Dirac semimetal Josephson junctions
• Observation of sub-kelvin superconductivity in Cd${}_3$As${}_2$ thin films
• Chirality Josephson current due to a novel quantum anomaly in inversion-asymmetric Weyl semimetals
• Topological insulator nanoribbon Josephson junctions: evidence for size effect in transport properties
• Multivalued current-phase relationship in a.c. Josephson effect for a three-dimensional Weyl semimetal WTe${}_2$
• Strain-gradient induced topological transition in bent nanoribbons of the Dirac semimetal Cd3As2
• Classifying induced superconductivity in atomically thin Dirac-cone materials
• Proximity-induced superconducting gap in the intrinsic magnetic topological insulator MnBi2Te4
• AC Josephson effect in a gate-tunable Cd${}_3$As${}_2$ nanowire superconducting weak link
• Multiple Andreev reflections in topological insulator nanoribbons
• Optimal Conditions for Observing Fractional Josephson Effect in Topological Josephson Junctions
• Absence of backscattering in Fermi-arc-mediated conductivity of topological Dirac semimetal Cd${}_3$As${}_2$
• Fractional ac Josephson effect as evidence of topological hinge states in a Dirac semimetal NiTe2