Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 19: Graphene: Structural properties

O 19.11: Vortrag

Montag, 31. März 2014, 18:30–18:45, WIL C107

Scatttering and electronic structure in graphene nanoflakes on Au(111) — •Philipp Leicht1, Lukas Zielke1, Samuel Bouvron1, Julia Tesch1, Felix Blumenschein1, Luca Gragnaniello1, Lukas Marsoner Steinkasserer2, Beate Paulus2, Elena Voloshina3, Yuriy Dedkov4, and Mikhail Fonin11Fachbereich Physik, Universität Konstanz — 2Institut für Chemie und Biochemie, FU Berlin — 3Institut für Chemie, HU Berlin — 4Fritz-Haber-Institut der MPG, Berlin

Confinement of electrons in graphene quantum dots and nano ribbons with atomically well defined edges represents an exciting field of research, owing to predicted peculiar electronic and magnetic properties.

Here, we present scanning tunneling microscopy (STM) investigations of graphene nano flakes (GNFs) prepared by temperature programmed growth on Ir(111) [1] and subsequent intercalation of Au for electronic decoupling. The electronic properties of the graphene flakes are addressed by scanning tunneling spectroscopy. Within our atomically resolved constant-energy maps we can probe the electronic states of the graphene electrons exploiting the intervalley scattering. The hereby obtained dispersion relation shows a linear behavior and can be unambiguously discriminated from the parabolic dispersion relation of the Au(111) surface state electrons. The intervalley scattering of graphene electrons forms discs in the Fourier transforms of constant-energy maps, which include additional scattering features compared to monolayer graphene.

[1] Coraux, J. et al., New J. Phys. 11, 023006 (2009)

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