Prominent among the many fascinating properties of graphene are its surprising electronic transport characteristics which are commonly studied theoretically and numerically within the Landauer-B”uttiker formalism. Here a device is characterized by its scattering properties to and from reservoirs connected by perfect semi-infinite leads, and transport quantities are derived from the scattering matrix. In many respects, however, the device becomes a `black box’ as one only analyses what goes in and out. Here we use the Husimi function as a complementary tool for understanding transport in graphene nanodevices. It is a phase space representation of the scattering wavefunctions that allows to link the scattering matrix to a more semiclassical and intuitive description and gain additional insight in to the transport process. In this article we demonstrate the benefits of the Husimi approach by analysing emph{Klein tunneling} and emph{intervalley scattering} in two simple graphene nanostructures.

Published : "arXiv Mesoscale and Nanoscale Physics".