Phys. Rev. B 82, 121101(R) (2010) [4 pages]Effect of noble-metal contacts on doping and band gap of graphene
Density-functional theory of graphene predicts that noble-metal contacts will provide doping but leave the Dirac crossing point intact. We use high-resolution angle-resolved photoemission and noble-metal intercalation to show that, instead, substantial band gaps open in proportion to the doping effect. Graphene on Au, however, remains gapless even during heavy electron doping by adsorbed Gd. A key role is assigned to quantum interference at the almost incommensurate graphene/Au interface. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.82.121101
DOI:
10.1103/PhysRevB.82.121101
PACS:
73.40.-c, 73.20.At, 79.60.Dp, 81.05.U-
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