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Sci Rep. 2013;3:2274. doi: 10.1038/srep02274.

Controllable disorder in a hybrid nanoelectronic system: realization of a superconducting diode.

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Graduate Institute of Applied Physics, National Taiwan University, Taipei 106, Taiwan.


We have studied a hybrid nanoelectronic system which consists of an AlGaAs/GaAs two-dimensional electron gas (2DEG) in close proximity (~70 nm) to an Al superconducting nanofilm. By tuning the current through the Al film, we can change the conductance of the 2DEG and furthermore vary the effective disorder in the Al superconducting film in a controllable way. When a high current is injected into the film, screening which couples the Al film and the 2DEG results in a collapse of anti-symmetric behavior in the current-voltage characteristics, V(I) ~ -V(-I), which holds true in a conventional superconductor. Our results may open a new avenue of experimentally realizing a superconducting diode.

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