Coulomb Drag and High Resistivity Behavior in Double Layer Graphene

N. M. R. Peres, J. M. B. Lopes dos Santos, A. H. Castro Neto

Published 2011-05-26, updated 2011-06-13Version 2

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.