Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)
O 41.108: Poster
Dienstag, 23. März 2010, 18:30–21:00, Poster B1
Electronic structure of a monolayer graphene on Ir(111) probed by ARPES — •Marko Kralj1, Ivo Pletikosić1, Milorad Milun1, Petar Pervan1, Alpha N’Diaye2, Carsten Busse2, Thomas Michely2, Jun Fujii3, Ivana Vobornik3, and Tonica Valla4 — 1Institut za fiziku, Zagreb — 2II. Physikalisches Institut, Köln — 3TASC Laboratory, Trieste — 4BNL, New York
Amongst realized examples of epitaxial growth on metal substrates, graphene on iridium is an exceptional case of long range structural quality and weak (electronic) bonding to a metal surface. These properties make this system very appealing for experimental studies of the electronic structure of graphene. Our recent ARPES study focused on the K point of graphene revealed that the weak electronic interaction of graphene with Ir(111) is reflected through the 0.1 eV hole doping and a minigap opening in the Dirac cone which is due to the 2.5 nm superperiodic potential originating from the about 10 % mismatched iridium and graphene [1]. In this work, ARPES is used to further investigate electronic properties and quality of graphene on Ir(111). For that purpose, we scan a wide portion of the Brillouin zone, use variable photon energy and different light polarization, and also perform photoemission of the adsorbed Xe.
[1] I. Pletikosić et al., Phys. Rev. Lett. 102, 056808 (2009).