Journal
SOLID STATE COMMUNICATIONS
Volume 143, Issue 1-2, Pages 72-76Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2007.02.044
Keywords
graphene; Josephson effect; superconductivity
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Graphene layers, prepared by mechanical exfoliation, were contacted by superconducting electrodes consisting of a titanium-aluminium bilayer. Quantum hall measurements in the normal state confirmed the single layer nature of the graphene samples. Proximity induced supercurrents were observed in all samples, below 1 K. Using a backgate, the Fermi energy could be swept from valence to conduction band via the Charge neutrality point, demonstrating supercurrents carried by holes and electrons, respectively. Interestingly, a finite supercurrent was also observed at the charge neutrality (or Dirac) point, where the density of carrier states vanishes. Our results demonstrate phase coherence in graphene. (c) 2007 Elsevier Ltd. All rights reserved.
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