Multiple Andreev reflections and Shapiro steps in a Ge-Si nanowire Josephson junction

Abstract

We present a Josephson junction based on a Ge-Si core-shell nanowire with transparent superconducting Al contacts, a building block which could be of considerable interest for investigating Majorana bound states, superconducting qubits and Andreev (spin) qubits. We demonstrate the dc Josephson effect in the form of a finite supercurrent through the junction, and establish the ac Josephson effect by showing up to 23 Shapiro steps. We observe multiple Andreev reflections up to the sixth order, indicating that charges can scatter elastically many times inside our junction, and that our interfaces between superconductor and semiconductor are transparent and have low disorder.

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• From Andreev to Majorana bound states in hybrid superconductor-semiconductor nanowires
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• Nanomaterials for Quantum Information Science and Engineering
• Enhancement of Proximity Induced Superconductivity in a Planar Ge Hole Gas
• Hard superconducting gap and diffusion-induced superconductors in Ge-Si nanowires
• Quantifying quantum coherence of multiple-charge states in tunable Josephson junctions
• Microscopic analysis of proximity-induced superconductivity and metallization effects in superconductor-germanium hole nanowires
• InAs/MoRe hybrid semiconductor/superconductor nanowire devices
• Microscopic theory of the current-voltage characteristics of Josephson tunnel junctions
• AC Josephson effect in a gate-tunable Cd${}_3$As${}_2$ nanowire superconducting weak link
• Effects of spin-orbit coupling and in-plane Zeeman fields on the critical current in two-dimensional hole gas SNS junctions
• Photon assisted tunneling of high order multiple Andreev reflections in epitaxial nanowire Josephson junctions
• Phase locking and fractional Shapiro steps in collective dynamics of microparticles
• Quantum effects in graphitic materials: Colossal magnetoresistance, Andreev reflections, Little-Parks effect, ferromagnetism, and granular superconductivity
• Complexity of Shapiro steps
• Spin-split superconductivity in spin-orbit coupled hybrid nanowires with ferromagnetic barriers
• Gate-Tunable Ambipolar Josephson Current in a Topological Insulator
• Impact of spin-orbit coupling and Zeeman interaction on the multiple Andreev reflections subharmonic gap structure in nanoscopic Josephson junctions
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• Electrical Properties of Selective-Area-Grown Superconductor-Semiconductor Hybrid Structures on Silicon