Dirac Cones and Minigaps for Graphene on Ir(111)
arXiv:0807.2770 · doi:10.1103/PhysRevLett.102.056808
Abstract
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 moire 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.
4 pages, 4 figures
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