Pb/InAs nanowire Josephson junction with high critical current and magnetic flux focusing

Abstract

We have studied mesoscopic Josephson junctions formed by highly $n$-doped InAs nanowires and superconducting Ti/Pb source and drain leads. The current-voltage properties of the system are investigated by varying temperature and external out-of-plane magnetic field. Superconductivity in the Pb electrodes persists up to $\sim 7$ K and with magnetic field values up to 0.4 T. Josephson coupling at zero backgate voltage is observed up to 4.5 K and the critical current is measured to be as high as 615 nA. The supercurrent suppression as a function of the magnetic field reveals a diffraction pattern that is explained by a strong magnetic flux focusing provided by the superconducting electrodes forming the junction.

6 pages, 5 color figures

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• Niobium Dayem nano-bridge Josephson field-effect transistors
• Josephson diode effect in monolithic dc-SQUIDs based on 3D Dayem nanobridges
• Dependence of the electronic structure of the EuS/InAs interface on the bonding configuration
• Full electrostatic control of quantum interference in an extended trenched Josephson junction
• Fully in-situ InAs nanowire Josephson junctions by selective-area growth and shadow evaporation
• Evidence for $\pi$-shifted Cooper quartets and few-mode transport in PbTe nanowire three-terminal Josephson junctions
• Identify the topological superconducting order in a multi-band quantum wire
• Josephson Effect in NbS${}_2$ van der Waals Junctions
• InAs/MoRe hybrid semiconductor/superconductor nanowire devices
• Weak de-localization in graphene on a ferromagnetic insulating film
• InAs on Insulator: A New Platform for Cryogenic Hybrid Superconducting Electronics
• Thouless energy in Josephson SN-N-NS bridges
• Fate of the superconducting state in floating islands of hybrid nanowire devices
• Josephson Field Effect Transistors with InAs on Insulator and High Permittivity Gate Dielectrics
• Side-gate modulation of supercurrent in InSb nanoflag-based Josephson junctions
• Gate-Tunable Ambipolar Josephson Current in a Topological Insulator
• Quasi-${\Phi }_0$-periodic supercurrent at quantum Hall transitions