Tunable Supercurrent Through Semiconductor Nanowires

Details Tunable Supercurrent Through Semiconductor Nanowires Tunable Supercurrent Through Semiconductor Nanowires

2005-08-23

arxiv.org/abs/cond-mat/0508558v1

Science 309, 272 (2005)

Physics

Condensed Matter

Superconductivity

9 pages, 3 figures

Scientific paper

10.1126/science.1113523

Nanoscale superconductor-semiconductor hybrid devices are assembled from InAs semiconductor nanowires individually contacted by aluminum-based superconductor electrodes. Below 1 K, 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 ac Josephson effect gives rise to Shapiro steps in the voltage-current characteristic under microwave irradiation.

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