Dirac cones and minigaps for graphene on Ir(111).

@article{Pletikosi2009DiracCA,
  title={Dirac cones and minigaps for graphene on Ir(111).},
  author={I Pletikosi{\'c} and Marko Kralj and Petar Pervan and Radovan Brako and Johann Coraux and Alpha T. N’Diaye and Carsten Busse and Thomas Michely},
  journal={Physical review letters},
  year={2009},
  volume={102 5},
  pages={
          056808
        }
}
Epitaxial graphene on Ir(111) prepared in excellent structural quality is investigated by angle-resolved photoelectron spectroscopy. It clearly displays a Dirac cone with the Dirac point shifted only slightly above the Fermi level. The moiré resulting from the overlaid graphene and Ir(111) surface lattices imposes a superperiodic potential giving rise to Dirac cone replicas and the opening of minigaps in the band structure. 
Large band gap opening between graphene Dirac cones induced by Na adsorption onto an Ir superlattice.
TLDR
It is found that Na is adsorbed on top of the graphene layer, and when coadsorbed onto an Ir cluster superlattice, it results in the opening of a large band gap of Δ(Na/Ir/G) = 740 meV, comparable to the one of Ge and with preserved high group velocity of the charge carriers. Expand
Superlattice effects in graphene on SiC(0001) and Ir(111) probed by ARPES
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Epitaxial graphene on metal surfaces
  • C. Busse
  • Materials Science
  • 2009 9th IEEE Conference on Nanotechnology (IEEE-NANO)
  • 2009
Epitaxial graphene can be grown by catalytic decomposition of hydrocarbons on Ir(111). Scanning tunneling microscopy reveals that C/Ir(111) has a high degree of structural quality (μm-sized domains,Expand
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Silicene nanoribbons grown on a silver (110) substrate have been studied by reflection electron energy loss spectroscopy as a function of the electron beam incidence angle α. The spectra, taken atExpand
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The sheet plasmon of graphene on Ir(111) was investigated in this paper by means of high-resolution electron energy loss spectroscopy. The perfect lateral coordination of sp2-hybridized C atoms on aExpand
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