Quantum transport properties of disordered graphene with structural defects (Stone-Wales and divacancies) are investigated using a realistic { \pi}-{ \pi}* tight-binding model elaborated from ab initio calculations. Mean free paths and semiclassical conductivities are then computed as a function of the nature and density of defects (using an order-N real-space Kubo-Greenwood method). By increasing of the defect density, the decay of the semiclassical conductivities is predicted to saturate to a minimum value of 4e^2/{ \pi}h over a large range (plateau) of carrier density (> 0.5 10^{ 14}cm^{ -2}). Additionally, strong contributions of quantum interferences suggest that the Anderson localization regime could be experimentally measurable for a defect density as low as 1%.
Categories: cond-mat.mes-hall