Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 4: Graphene I

O 4.1: Talk

Monday, March 26, 2012, 10:30–10:45, MA 041

Photoemission Microspectroscopy of Single Layer Graphene on Iridium. — •Christian Witt, Jan Vanis, Michael Horn-von Hoegen, and Frank-J. Meyer zu Heringdorf — University Duisburg-Essen, Faculty of Physics and CeNiDE, Lotharstrasse 1, 47048 Duisburg

Graphene is one of the most investigated materials in modern physics. Especially the differences of the band structure of free standing Graphene and Graphene grown on a substrate is of great interest. A standard method to grow single layer Graphene is chemical vapor deposition using Ethene as a carbon source and heated Iridium crystals as substrate and catalyst. We combined photoemission electron microscopy with various illumination sources to investigate the morphology and band structure of Graphene on Iridium. In our experiments, under illumination with a Helium discharge lamp (photon energy of 21.2 eV) we find the well known energy bands of Graphene. In contrast, under illumination with 200 nm femtosecond laser pulses (photon energy of 6.2 eV) we find a significant density of states at the Γ point.