We study the electronic transmission through a graphene bilayer in the presence of an applied bias between the layers. We consider different geometries involving interfaces between both a monolayer and a bilayer and between two bilayers. The applied bias opens a sizable gap in the spectrum inside the bilayer barrier region, thus leading to large changes in the transmission probability and electronic conductance that are controlled by the applied bias.

• Received 17 September 2007

DOI:https://doi.org/10.1103/PhysRevB.76.165416