Physics – Condensed Matter – Materials Science
Scientific paper
2010-11-17
Phys. Rev. B 83, 081415(R) (2011)
Physics
Condensed Matter
Materials Science
revised version
Scientific paper
10.1103/PhysRevB.83.081415
Epitaxial graphene grown on transition metal surfaces typically exhibits a moir\'e pattern due to the lattice mismatch between graphene and the underlying metal surface. We use both scanning tunneling microscopy (STM) and atomic force microscopy (AFM) experiments to probe the electronic and topographic contrast of the graphene moir\'e on the Ir(111) surface. While STM topography is influenced by the local density of states close to the Fermi energy and the local tunneling barrier height, AFM is capable of yielding the 'true' surface topography once the background force arising from the van der Waals (vdW) interaction between the tip and the substrate is taken into account. We observe a moir\'e corrugation of 35$\pm$10 pm, where the graphene-Ir(111) distance is the smallest in the areas where the graphene honeycomb is atop the underlying iridium atoms and larger on the fcc or hcp threefold hollow sites.
Hämäläinen Sampsa K.
Lahtinen Jouko
Liljeroth Peter
Sainio Jani
Sun Zhixiang
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