Dirac Cones and Minigaps for Graphene on Ir(111)

Details Dirac Cones and Minigaps for Graphene on Ir(111) Dirac Cones and Minigaps for Graphene on Ir(111)

2008-07-17

arxiv.org/abs/0807.2770v2

Phys. Rev. Lett. 102, 056808 (2009)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.102.056808

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 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.

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