Conductance anisotropy in epitaxial graphene sheets generated by substrate interactions.
basic_science · Level V
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- Record sourced from PubMed, PMID 20397734.
- Also identified by DOI 10.1021/nl9035302.
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Abstract
We present the first microscopic transport study of epitaxial graphene on SiC using an ultrahigh vacuum four-probe scanning tunneling microscope. Anisotropic conductivity is observed that is caused by the interaction between the graphene and the underlying substrate. These results can be explained by a model where charge buildup at the step edges leads to local scattering of charge carriers. This highlights the importance of considering substrate effects in proposed devices that utilize nanoscale patterning of graphene on electrically isolated substrates.
Medical subject headings
- Carbon Compounds, Inorganic
- Crystallization
- Graphite
- Microscopy, Scanning Probe
- Nanostructures
- Nanotechnology
- Silicon Compounds