Selective-Area-Grown PbTe-Pb Planar Josephson Junctions for Quantum Devices

Abstract

Planar Josephson junctions are predicted to host Majorana zero modes. The material platforms in previous studies are two dimensional electron gases (InAs, InSb, InAsSb and HgTe) coupled to a superconductor such as Al or Nb. Here, we introduce a new material platform for planar JJs, the PbTe-Pb hybrid. The semiconductor, PbTe, was grown as a thin film via selective area epitaxy. The Josephson junction was defined by a shadow wall during the deposition of the superconductor Pb. Scanning transmission electron microscopy reveals a sharp semiconductor-superconductor interface. Gate-tunable supercurrent and multiple Andreev reflections are observed. A perpendicular magnetic field causes interference patterns of the switching current, exhibiting Fraunhofer-like and SQUID-like behaviors. We further demonstrate a prototype device for Majorana detection, wherein phase bias and tunneling spectroscopy are applicable.

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Cited by in corpus (13)

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• Gate-tunable subband degeneracy in semiconductor nanowires
• Subgap states in semiconductor-superconductor devices for quantum technologies: Andreev qubits and minimal Majorana chains
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• SQUID oscillations in PbTe nanowire networks
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• Theory for electron and hole fine structure and Landé g-factors in lead chalcogenide nanowires
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• Ab initio study of Proximity-Induced Superconductivity in PbTe/Pb heterostructures
• Presence versus absence of charging energies in PbTe quantum dots