Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 67: Graphene IV

O 67.1: Vortrag

Donnerstag, 17. März 2011, 11:15–11:30, WIL B321

Electronic properties and localization of Fe atoms on bilayer graphene on Ru(0001) — Thomas Eelbo, Mike Gyamfi, •Marta Waśniowska, and Roland Wiesendanger — Institute of Applied Physics, University Hamburg, Jungiusstr. 11, 20355 Hamburg

We have investigated the electronic properties and a localization of iron adatoms and clusters on monolayer and bilayer graphene on Ru(0001). The epitaxial monolayer graphene (MLG) on Ru(0001) displays a Moiré pattern revealing a strong electronic coupling with the substrate [1], but the second layer (BLG) reveals properties of uncoupled graphene with a Dirac point at  -0.5 eV [2]. In order to provide insights into the electronic properties of single Fe adatoms on graphene on Ru(0001) we performed scanning tunneling microscopy/spectrocopy at 5 K. We find that Fe adatoms are weakly attached to MLG and form clusters. However, when atoms are adsorbed on BLG, they are attracted by point defects and strained regions of graphene. Scanning tunneling spectroscopy measurements show that adatoms adsorbed on defect sites reveal the existence of a resonance state at +0.5 eV for single adatoms on BLG, which is also observed for single Fe atoms on Ru(0001).

[1] S. Marchini et al., Phys. Rev. B 76, 075429 (2007)

[2] P. Sutter et al., Nano Lett. 9, 2654 (2009)