Suppression of magnetotransport in strongly disordered graphene.
A tight-binding model with randomly fluctuating atomic positions is studied to discuss the effect of strong disorder in graphene. We employ a strong-disorder expansion for the transport quantities and find a diffusive behavior, where the conductivity is decreasing with increasing disorder. For sufficiently strong disorder the magnetic field drops out of the diffusion coefficient and the conductivity. This signals a strong suppression of magnetotransport effects, a result which is consistent with recent experimental observations by Morozov et al.
Ziegler
K
K
Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany. Klaus.Ziegler@Physik.Uni-Augsburg.de