Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.94: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
Two-photon photoelectron spectroscopy of graphene on SiC(0001) — •Dieter Gugel1, Daniel Niesner1, Florian Speck2, Thomas Seyller2, and Thomas Fauster1 — 1Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen, Germany — 2Lehrstuhl für Technische Physik, Erwin-Rommel-Straße 1, 91058 Erlangen, Germany
A monolayer of graphene grown epitaxially on the silicon face of silicon carbide was investigated using angle- and time-resolved two-photon photoelectron spectroscopy. In this measurement, the surface electrons were excited by a UV pump laser with a photon energy of 4.66 eV and a pulse duration of 58 fs. Using an IR probe puls with an energy of 1.55 eV and a pulse width of 33 fs, we determined the energy dispersion and lifetime of the lowest unoccupied image potential state. The lifetime of this state was observed to be 50 fs. Moreover, we measured the work function of the surface, which amounts to 4.5 eV.