Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 50: Graphene (organized by O)

TT 50.12: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster A

Phonon Dispersion of Bilayer Graphene on 6H-SiC(0001) — •Sindy Franz, Christian Heidrich, Roland J. Koch, and Thomas Seyller — Institut für Physik, TU Chemnitz, Reichenhainer Str. 70, D-09126 Chemnitz, Germany

Electron phonon coupling in graphene leads to characteristic changes in the phonon dispersion as well as a renormalization of the band structure. In the phonon dispersion it results in the well-known Kohn anomalies at the center of the Brillouin zone as well as the K-point. Using high-resolution electron energy loss spectroscopy (HREELS) in off-specular scattering geometry we investigate the phonon dispersion of epitaxial bilayer graphene on silicon carbide. In order to interpret our results, we compare them to previous measurements of monolayer graphene and of the buffer layer.