Effect of a high-kappa environment on charge carrier mobility in graphene.
It is widely assumed that the dominant source of scattering in graphene is charged impurities in a substrate. We have tested this conjecture by studying graphene placed on various substrates and in high-kappa media. Unexpectedly, we have found no significant changes in carrier mobility either for different substrates or by using glycerol, ethanol, and water as a top dielectric layer. This suggests that Coulomb impurities are not the scattering mechanism that limits the mean free path attainable for graphene on a substrate.
Ponomarenko
L A
LA
Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Manchester M13 9PL, United Kingdom.
Yang
R
R
Mohiuddin
T M
TM
Katsnelson
M I
MI
Novoselov
K S
KS
Morozov
S V
SV
Zhukov
A A
AA
Schedin
F
F
Hill
E W
EW
Geim
A K
AK