Scanning tunneling microscopy on epitaxial bilayer graphene on ruthenium (0001)

Authors

Eli A. Sutter, University of Nebraska–LincolnFollow
D.P. Acharya, Brookhaven National Laboratory
J.T. Sadowski, Brookhaven National Laboratory
P. Sutter, Brookhaven National LaboratoryFollow

Document Type

Article

Date of this Version

3-30-2009

Citation

133101-2 Sutter et al. Appl. Phys. Lett. 94, 133101 (2009) Page 1-3

Comments

© 2009 American Institute of Physics

Abstract

The atomic structure of epitaxial single and bilayer graphene on Ru(0001) was studied by scanning tunneling microscopy (STM). High-resolution imaging of the surface of single layer graphene shows a moiré with pronounced buckling and broken A/B carbon sublayer symmetry due to a strong interaction with the metal substrate. The top sheet of bilayer graphene is largely unperturbed by residual interactions with the substrate. Screened from the metal substrate, it shows the hallmarks of freestanding monolayer graphene: a honeycomb structure with equivalent carbon sublattices imaged in STM and a linear dispersion of bands near the Dirac point.