Motivated by previous experiments, which found substantial disorder in graphene, transport in the presence of weak and strong disorder on a honeycomb lattice was considered. Assuming that disorder was due mainly to ripples in the graphene sheet, a model for random bonds was studied. Several approaches were discussed and their results in terms of the conductivity were compared. This leads to the conclusion that transport in graphene must be of a diffusive nature.

Diffusive Transport in Graphene. Ziegler, K.: Physica E, 2008, 40[7], 2622-5