Supercurrent and Multiple Andreev Reflections in InSb Nanosheet SNS Junctions
Authors: Zhi, JH; Kang, N; Li, S; Fan, DX; Su, FF; Pan, D; Zhao, SP; Zhao, JH; Xu, HQ
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
Volume: 256 Issue: 6 Published: JUN 2019 Language: English Document type: Article
DOI: 10.1002/pssb.201800538
Abstract:
In this study, the realization of mesoscopic Josephson junctions based on free-standing InSb nanosheet grown by molecular-beam epitaxy is reported. Below the critical temperature of superconducting aluminium electrodes (approximate to 1.1 K), the high transparency of the contacts gives rise to proximity-induced superconductivity. A dissipationless supercurrent which can be modulated by a gate voltage acting on the electron density in the nanosheet flows through the superconducting weak links. At finite bias voltage, subharmonic energy-gap structures (SGS) originating from multiple Andreev reflections (MARs) are observed, indicating a highly transparent InSb nanosheet-superconductor interface. At last, a superconducting hybrid device with niobium electrodes is shown, suitable for further higher temperature and magnetic field transport measurements.
Full Text: https://onlinelibrary.wiley.com/doi/10.1002/pssb.201800538