Proximity effect and multiple Andreev reflections in few-layer graphene

@article{Shailos2007ProximityEA,
  title={Proximity effect and multiple Andreev reflections in few-layer graphene},
  author={A. Shailos and Willy Nativel and Alik Yu. Kasumov and C. Collet and M. Ferrier and Sophie Gu{\'e}ron and Richard Deblock and H.Bouchiat},
  journal={EPL},
  year={2007},
  volume={79},
  pages={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 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… 

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