2 research outputs found
Express Optical Analysis of Epitaxial Graphene on SiC: Impact of Morphology on Quantum Transport
We show that inspection with an optical
microscope allows surprisingly
simple and accurate identification of single and multilayer graphene
domains in epitaxial graphene on silicon carbide (SiC/G) and is informative
about nanoscopic details of the SiC topography, making it ideal for
rapid and noninvasive quality control of as-grown SiC/G. As an illustration
of the power of the method, we apply it to demonstrate the correlations
between graphene morphology and its electronic properties by quantum
magneto-transport
Quantum Hall Effect and Quantum Point Contact in Bilayer-Patched Epitaxial Graphene
We study an epitaxial graphene monolayer
with bilayer inclusions
via magnetotransport measurements and scanning gate microscopy at
low temperatures. We find that bilayer inclusions can be metallic
or insulating depending on the initial and gated carrier density.
The metallic bilayers act as equipotential shorts for edge currents,
while closely spaced insulating bilayers guide the flow of electrons
in the monolayer constriction, which was locally gated using a scanning
gate probe