Physics – Condensed Matter – Materials Science
Scientific paper
2007-02-23
Physics
Condensed Matter
Materials Science
9 pages with 6 figures
Scientific paper
10.1103/PhysRevB.75.214109
We present a structural analysis of the multi-layer graphene-4HSiC(000-1}) system using Surface X-Ray Reflectivity. We show for the first time that graphene films grown on the C-terminated (000-1}) surface have a graphene-substrate bond length that is very short (0.162nm). The measured distance rules out a weak Van der Waals interaction to the substrate and instead indicates a strong bond between the first graphene layer and the bulk as predicted by ab-initio calculations. The measurements also indicate that multi-layer graphene grows in a near turbostratic mode on this surface. This result may explain the lack of a broken graphene symmetry inferred from conduction measurements on this system [C. Berger et al., Science 312, 1191 (2006)].
Berger Clemens
Conrad Edward H.
de Heer Walt. A.
Feng Rongquan
First Phillip N.
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