Scanning tunneling spectroscopy of inhomogeneous electronic structure in monolayer and bilayer graphene on SiC
By V. Brar, Yuanbo Zhang, Yossi Yayon, A. Bostwick, T. Ohta, J. McChesney, K. Horn, Eli Rotenberg, M. Crommie. 2007
222 citations recorded by the source corpus.
The authors 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 an ∼100meV gaplike 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 relevant for potential devices involving electronic transport or tunneling in graphene/SiC.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/eea6219436e1fe6ab352c62c7e958b072c91b404
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Citations in the corpus
- Epitaxial Graphene on SiC: A Review of Growth and Characterization (2016, background): “S nce LEEM results showed only o ML graph ne on our sampl s, the reports [122,123] which claim that two to three ML of graphene are required for the existence of the three-for-six arrangement cannot be valid.”
- Electronic transport in two-dimensional graphene (2010, methodology): “The first imaging experiments using scanning tunneling microscopy, STM, were done on epitaxial graphene (Brar et al., 2007; Rutter et al., 2007).”
- Substrate-induced bandgap opening in epitaxial graphene. (2007, background): “Indeed, topographic Scanning Tunneling Microscopy (STM) images for bilayer graphene have clearly shown inequivalent A and B sublattices [26, 28, 29], similar to what has been observed for graphite [30].”