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Paper detail

Graphene on Ru(0001): A corrugated and chiral structure

We present a structural analysis of the graphene/Ru(0001) system obtained by surface x-ray diffraction. The data were fit using Fourier-series expanded displacement fields from an ideal bulk structure, plus the application of symmetry constraints. The shape of the observed superstructure rods proves a reconstruction of the substrate, induced by strong bonding of graphene to ruthenium. Both the graphene layer and the underlying substrate are corrugated, with peak-to-peak heights of (0.82 +/- 0.15) A and (0.19 +/- 0.02) A for the graphene and topmost Ru-atomic layer, respectively. The Ru-corrugation decays slowly over several monolayers into the bulk. The system also exhibits chirality, whereby in-plane rotations of up to 2.0 degrees in those regions of the superstructure where the graphene is weakly bound are driven by elastic energy minimization.

preprint2010arXivOpen access
D. MartocciaM. BjoerckC. M. SchlepuetzT. BruggerS. A. PauliB. D. PattersonT. GreberP. R. Willmott
cond-mat.mtrl-sci
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D. MartocciaM. BjoerckC. M. SchlepuetzT. BruggerS. A. PauliB. D. PattersonT. GreberP. R. Willmott

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