Theory of carrier transport in graphene double-layer structure with   carrier imbalance
  The carrier mobility of a graphene double-layer system is evaluated on the basis of the Boltzmann transport theory. In this system, two graphene layers are separated by a dielectric barrier layer. We focus on the cases in which there is carrier imbalance between the two layers. It is found that the mobility can be improved by controlling the carrier density polarization between the two layers if we choose an appropriate dielectric environment. 
Kazuhiro Hosono, Katsunori Wakabayashi
cond-mat.mes-hall