Superconducting proximity effect in InAsSb surface quantum wells with in-situ Al contact

Abstract

We demonstrate robust superconducting proximity effect in InAs${}_{0.5}$Sb${}_{0.5}$ quantum wells grown with epitaxial Al contact, which has important implications for mesoscopic and topological superconductivity. Unlike more commonly studied InAs and InSb semiconductors, bulk InAs${}_{0.5}$Sb${}_{0.5}$ supports stronger spin-orbit coupling and larger $g$-factor. However, these potentially desirable properties have not been previously measured in epitaxial heterostructures with superconductors, which could serve as a platform for fault-tolerant topological quantum computing. Through structural and transport characterization we observe high-quality interfaces and strong spin-orbit coupling. We fabricate Josephson junctions based on InAs${}_{0.5}$Sb${}_{0.5}$ quantum wells and observe strong proximity effect. These junctions exhibit product of normal resistance and critical current, $I_{c}R_{N} = \SI{270}{\micro V}$, and excess current, $I_{ex}R_{N} = \SI{200}{\micro V}$ at contact separations of 500~nm. Both of these quantities demonstrate a robust and long-range proximity effect with highly-transparent contacts.

References in corpus (18)

• New directions in the pursuit of Majorana fermions in solid state systems
• Realizing Majorana zero modes in superconductor-semiconductor heterostructures
• Milestones toward Majorana-based quantum computing
• Evidence of topological superconductivity in planar Josephson junctions
• Topological Superconductivity in a Phase-Controlled Josephson Junction
• Ultrafast spin-lasers
• Quantized conductance doubling and hard gap in a two-dimensional semiconductor-superconductor heterostructure
• Next steps of quantum transport in Majorana nanowire devices
• Phase signature of topological transition in Josephson Junctions
• Topological Phases in InAs${}_{1-x}$Sb${}_x$: From Novel Topological Semimetal to Majorana Wire
• Engineering Hybrid Epitaxial InAsSb/Al Nanowire Materials for Stronger Topological Protection
• Superconducting proximity effect in epitaxial Al-InAs heterostructures
• Quantized conductance and large g-factor anisotropy in InSb quantum point contacts
• Spin-orbit coupling effects in zinc-blende InSb and wurtzite InAs nanowires: Realistic calculations with multiband $\vec{k}\cdot \vec{p}$ method
• Analytical calculation of the excess current in the OTBK theory
• Nb/InAs nanowire proximity junctions from Josephson to quantum dot regimes
• Magneto-conductance of topological junctions based on two-dimensional electron gases reveals Majorana phases
• Electrical tuning of helical edge states in topological multilayers

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• Epitaxial Superconductor-Semiconductor Two-Dimensional Systems for Superconducting Quantum Circuits
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• Half-integer Shapiro steps in highly transmissive InSb nanoflag Josephson junctions
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• Anomalous dimensions at large charge in d=4 O(N) theory
• Crystalline Anisotropic Topological Superconductivity in Planar Josephson Junctions
• Giant $g$-factors and fully spin-polarized states in metamorphic short-period InAsSb/InSb superlattices
• Mobility exceeding 100,000 cm${}^2$/Vs in modulation-doped shallow InAs quantum wells coupled to epitaxial aluminum
• Theory of scanning gate microscopy imaging of the supercurrent distribution in a planar Josephson junction
• Phase jumps in Josephson junctions with time-dependent spin-orbit coupling
• $g$-factor engineering with InAsSb alloys toward zero band gap limit
• Disorder effects in planar semiconductor-superconductor structures: Majorana wires versus Josephson junctions
• Spin-resolved nonlocal transport in proximitized Rashba nanowires
• High transparency induced superconductivity in field effect two-dimensional electron gases in undoped InAs/AlGaSb surface quantum wells
• Planar Josephson junction devices with narrow superconducting strips: Topological properties and optimization
• Emergence of a condensate with finite-energy Cooper pairing in hybrid exciton/superconductor systems