Transmission through a biased graphene bilayer barrier
  We study the electronic transmission through a graphene bilayer in the presence of an applied bias between 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. 
Johan Nilsson, A. H. Castro Neto, F. Guinea, N. M. R. Peres