High transmission in twisted bilayer graphene with angle disorder
Héctor Sainz-Cruz, Tommaso Cea, Pierre A. Pantaleón, F. Guinea
Abstract
Angle disorder is an intrinsic feature of twisted bilayer graphene and other moir\'e materials. Here, we discuss electron transport in twisted bilayer graphene in the presence of angle disorder. We compute the local density of states and the Landauer-B\"uttiker transmission through an angle disorder barrier with a width comparable to the moir\'e period, using a decimation technique based on a real-space description. We find that barriers which separate regions where the widths of the bands differ by $50%$ or more lead to a minor suppression of the transmission and that the transmission is close to 1 for normal incidence, which is reminiscent of Klein tunneling. These results suggest that transport in twisted bilayer graphene is weakly affected by twist angle disorder.