Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-06-26
Physics
Condensed Matter
Strongly Correlated Electrons
Acknowledgment added. 11 pages, 3 figures
Scientific paper
10.1063/1.2771084
We present a scanning tunneling spectroscopy (STS) study of the local electronic structure of single and bilayer graphene grown epitaxially on a SiC(0001) surface. Low voltage topographic images reveal fine, atomic-scale carbon networks, whereas higher bias images are dominated by emergent spatially inhomogeneous large-scale structure similar to a carbon-rich reconstruction of SiC(0001). STS spectroscopy shows a ~100meV gap-like feature around zero bias for both monolayer and bilayer graphene/SiC, as well as significant spatial inhomogeneity in electronic structure above the gap edge. Nanoscale structure at the SiC/graphene interface is seen to correlate with observed electronic spatial inhomogeneity. These results are important for potential devices involving electronic transport or tunneling in graphene/SiC.
Bostwick Aaron
Brar Victor W.
Crommie Michael F.
Horn Karsten
McChesney Jessica L.
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