Josephson supercurrent in a topological insulator without a bulk shunt

Abstract

A Josephson supercurrent has been induced into the three-dimensional topological insulator Bi1.5Sb0.5Te1.7Se1.3. We show that the transport in Bi1.5Sb0.5Te1.7Se1.3 exfoliated flakes is dominated by surface states and that the bulk conductivity can be neglected at the temperatures where we study the proximity induced superconductivity. We prepared Josephson junctions with widths in the order of 40 nm and lengths in the order of 50 to 80 nm on several Bi1.5Sb0.5Te1.7Se1.3 flakes and measured down to 30 mK. The Fraunhofer patterns unequivocally reveal that the supercurrent is a Josephson supercurrent. The measured critical currents are reproducibly observed on different devices and upon multiple cooldowns, and the critical current dependence on temperature as well as magnetic field can be well explained by diffusive transport models and geometric effects.

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• Topological superconductors: a review
• Transport in two-dimensional topological materials: recent developments in experiment and theory
• Non-sinusoidal current-phase relationship in Josephson junctions from the 3D topological insulator HgTe
• Field-free anomalous junction and superconducting diode effect in spin split superconductor/topological insulator junctions
• Anomalous Fraunhofer patterns in gated Josephson junctions based on the bulk-insulating topological insulator BiSbTeSe2
• Revealing surface states in In-doped SnTe superconducting nanoplates with low bulk mobility
• Novel self-epitaxy for inducing superconductivity in the topological insulator (Bi1-xSbx)2Te3
• Anomalous Josephson effect in d-wave superconductor junctions on TI surface
• Proximity-induced supercurrent through topological insulator based nanowires for quantum computation studies
• Josephson supercurrent in a topological insulator without a bulk shunt
• Observation of the superconducting proximity effect in the surface state of SmB6 thin films
• Tunneling spectroscopy and Josephson current of superconductor-ferromagnet hybrids on the surface of a 3D TI
• Proximity induced time-reversal topological superconductivity in Bi2Se3 films without phase tuning
• Conduction spectroscopy of a proximity induced superconducting topological insulator
• Odd-frequency superconductivity induced in topological insulators with and without hexagonal warping
• Bulk Superconductivity in the Dirac Semimetal TlSb
• Micro-metric electronic patterning of a topological band structure using a photon beam
• Electronic correlations in magnetized helical edge states coupled to s-wave superconductors