Abstract
We study the effect of the Klein tunneling on the transport properties of graphene p-n-p junctions. We first analyze the ideal case of a clean system and then study the realistic case in which disorder is present. To take into account the effect of disorder we develop a method for obtaining quantum transport properties in graphene that uniquely combines three crucial features: microscopic treatment of charge disorder, fully quantum mechanical analysis of transport, and the ability to model experimentally relevant system sizes. Our results allow us to conclude unambiguously that recent transport experiments on graphene p-n-p junctions have indeed observed signatures of Klein tunneling. The analysis presented is based on Rossi et al. Phys. Rev. B 81, 121408R.
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