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O: Fachverband Oberflächenphysik

O 99: Electron and spin dynamics II

O 99.1: Vortrag

Freitag, 18. März 2011, 11:15–11:30, WIL B321

Image-potential states on graphene on Ir(111) — •Daniel Niesner and Thomas Fauster — Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen, Germany

Graphene, a single layer of graphitic carbon, can be produced with high quality on different metal substrates by decomposition of hydrocarbons. On the hexagonal Ir(111) surface the growth of graphene is self-limiting to a single layer with pronounced Moiré superstructure.^[1]

Image-potential states, which are unoccupied electronic surface states close to the vacuum level, were investigated by time- and angle-resolved two-photon photoelectron spectroscopy. Besides the work function of the material, binding energies and lifetimes of the lowest three image-potential states were determined. The dispersion and intensity distribution of the first two states will be presented.

[1] A. T. N’Diaye et al., Phys. Rev. Lett. 97, 215501 (2006)