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Doh, Yong-Joo; van Dam, Jorden A; Roest, Aarnoud L; Bakkers, Erik P. A. M; Kouwenhoven, Leo P; De Franceschi, Silvano
Science (American Association for the Advancement of Science), 07/2005, Letnik: 309, Številka: 5732Journal Article
Nanoscale superconductor/semiconductor hybrid devices are assembled from indium arsenide semiconductor nanowires individually contacted by aluminum-based superconductor electrodes. Below 1 kelvin, the high transparency of the contacts gives rise to proximity-induced superconductivity. The nanowires form superconducting weak links operating as mesoscopic Josephson junctions with electrically tunable coupling. The supercurrent can be switched on/off by a gate voltage acting on the electron density in the nanowire. A variation in gate voltage induces universal fluctuations in the normal-state conductance, which are clearly correlated to critical current fluctuations. The alternating-current Josephson effect gives rise to Shapiro steps in the voltage-current characteristic under microwave irradiation.
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