Proximity Induced Superconductivity and Multiple Andreev Reflections in Few-Layer-Graphene

Details Proximity Induced Superconductivity and Multiple Andreev Reflections in Few-Layer-Graphene Proximity Induced Superconductivity and Multiple Andreev Reflections in Few-Layer-Graphene

2006-12-02

arxiv.org/abs/cond-mat/0612058v2

Euro. Phys. Lett. 79, 57008 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1209/0295-5075/79/57008

We have investigated electronic transport of few-layer-graphene (FLG) connected to superconducting electrodes. The device is prepared by mechanical exfoliation of graphite. A small mesa of FLG is placed on the surface of an insulating Alumina layer over silicon substrate, and is connected with two tungsten electrodes, separated by 2.5 microns, grown by focused ion beam. While tungsten electrodes are superconducting below 4 K, proximity induced superconductivity in FLG is observed below 1K with a large differential resistance drop at low bias. Signatures of multiple Andreev reflections are observed as peaks located at voltages corresponding to sub-multiple values of the superconducting gap of the electrodes.

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