Proximity effect and multiple Andreev reflections in few-layer graphene
- 6 August 2007
- journal article
- Published by IOP Publishing in Europhysics Letters
- Vol. 79 (5), 57008
- https://doi.org/10.1209/0295-5075/79/57008
Abstract
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 connected to two tungsten electrodes, separated by 2.5 μm, grown by focused ion beam. Whereas the tungsten electrodes are superconducting below 4 K, the proximity effect in FLG develops below 1 K, and is characterized by a factor 2 differential resistance drop at low bias. We find multiple Andreev reflection peaks at voltages corresponding to submultiples of 2Δ/e (with Δ the superconducting gap of the electrodes), which persist up to fields of a few tesla.Keywords
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