Hybrid Superconductor-Quantum Point Contact Devices using InSb Nanowires

Abstract

Proposals for studying topological superconductivity and Majorana bound states in nanowires proximity coupled to superconductors require that transport in the nanowire is ballistic. Previous work on hybrid nanowire-superconductor systems has shown evidence for Majorana bound states, but these experiments were also marked by disorder, which disrupts ballistic transport. In this letter, we demonstrate ballistic transport in InSb nanowires interfaced directly with superconducting Al by observing quantized conductance at zero-magnetic field. Additionally, we demonstrate that the nanowire is proximity coupled to the superconducting contacts by observing Andreev reflection. These results are important steps for robustly establishing topological superconductivity in InSb nanowires.

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Cited by in corpus (13)

• Ballistic superconductivity in semiconductor nanowires
• Hard superconducting gap in InSb nanowires
• Odd-frequency superconducting pairing in one-dimensional systems
• Odd-frequency superconducting pairing in junctions with Rashba spin-orbit coupling
• Strong influence of spin-orbit coupling on magnetotransport in two-dimensional hole systems
• Odd-frequency superconducting pairing in Kitaev-based junctions
• Gate-defined Quantum Point Contact in an InSb Two-dimensional Electron Gas
• A Gate-Defined Quantum Point Contact in an InAs Two-Dimensional Electron Gas
• Selective Area Superconductor Epitaxy to Ballistic Semiconductor Nanowires
• Building a bigger Hilbert space for superconducting devices, one Bloch state at a time
• Signatures of quantum mechanical Zeeman effect in classical transport due to topological properties of two-dimensional spin-3/2 holes
• Fermionic quantum computation with Cooper pair splitters
• Engineering tunnel junctions on ballistic semiconductor nanowires