Kavli Affiliate: Ke Wang
| First 5 Authors: Ke Wang, T. A. Sedrakyan, , ,
| Summary:
We report that a perpendicular magnetic field introduces an anomalous
interaction correction, $delta sigma$, to the static conductivity of doped
graphene in the ballistic regime. The correction implies that the
magnetoresistance, $delta rho_{xx}$ scales inversely with temperature $delta
rho_{xx}(T) propto 1/T$ in a parametrically large interval. When the disorder
is scalar-like, the $propto 1/T$ behavior is the leading contribution in the
crossover between diffusive regime exhibiting weak localization and quantum
magnetooscillations. The behavior originates from the field-induced breaking of
the chiral symmetry of Dirac electrons around a single valley. The result is
specific for generic two-dimensional Dirac materials which deviate from the
half-filling. We conclude by proposing magnetotransport experiments, which have
the capacity to detect the nature of impurities and defects in high-mobility
Dirac monolayers such as recently fabricated ballistic graphene samples.
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