Weak localization in bilayer graphene.
We have performed the first experimental investigation of quantum interference corrections to the conductivity of a bilayer graphene structure. A negative magnetoresistance--a signature of weak localization--is observed at different carrier densities, including the electroneutrality region. It is very different, however, from the weak localization in conventional two-dimensional systems. We show that it is controlled not only by the dephasing time, but also by different elastic processes that break the effective time-reversal symmetry and provide intervalley scattering.
Gorbachev
R V
RV
School of Physics, University of Exeter, Stocker Road, Exeter, EX4 4QL, United Kingdom.
Tikhonenko
F V
FV
Mayorov
A S
AS
Horsell
D W
DW
Savchenko
A K
AK
D002244:Carbon / Q000737:chemistry*; D004553:Electric Conductivity; D004583:Electrons; D006108:Graphite / Q000737:chemistry; D008280:Magnetics
D002244:Carbon; D006108:Graphite