Real-time observation of discrete Andreev tunneling events

Details Real-time observation of discrete Andreev tunneling events Real-time observation of discrete Andreev tunneling events

2010-12-28

arxiv.org/abs/1012.5750v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We provide a direct proof of two-electron Andreev transitions in a superconductor - normal metal tunnel junction by detecting them in a real-time electron counting experiment. Our results are consistent with ballistic Andreev transport with an order of magnitude higher rate than expected for a uniform barrier, suggesting that only part of the interface is effectively contributing to the transport. These findings are quantitatively supported by our direct current measurements in single-electron transistors with similar tunnel barriers.

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