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Supercurrent and Multiple Andreev Reflections in InSb Nanosheet SNS Junctions
Author(s) -
Zhi Jinhua,
Kang Ning,
Li Sen,
Fan Dingxun,
Su Feifan,
Pan Dong,
Zhao Shiping,
Zhao Jianhua,
Xu Hongqi
Publication year - 2019
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201800538
Subject(s) - supercurrent , mesoscopic physics , nanosheet , superconductivity , condensed matter physics , josephson effect , andreev reflection , materials science , proximity effect (electron beam lithography) , molecular beam epitaxy , physics , epitaxy , nanotechnology , electron beam lithography , layer (electronics) , resist
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 (≈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.