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.
Cavendish Laboratory, 19 JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
Cassandra
C
Chua
Malcolm
M
Connolly
Arseniy
A
Lartsev
Tom
T
Yager
Samuel
S
Lara-Avila
Sergey
S
Kubatkin
Sergey
S
Kopylov
Vladimir
V
Fal'ko
Rositza
R
Yakimova
Ruth
R
Pearce
T J B M
TJ
Janssen
Alexander
A
Tzalenchuk
Charles G
CG
Smith