Coulomb Drag and High Resistivity Behavior in Double Layer Graphene
  We show that Coulomb drag in ultra-clean graphene double layers can be used for controlling the on/off ratio for current flow by tunning the external gate voltage. Hence, although graphene remains semi-metallic, the double layer graphene system can be tuned from conductive to a highly resistive state. We show that our results explain previous data of Coulomb drag in double layer graphene samples in disordered SiO2 substrates. 
N. M. R. Peres, J. M. B. Lopes dos Santos, A. H. Castro Neto
cond-mat.mes-hall cond-mat.mtrl-sci cond-mat.str-el