The Influence of Remote Bands on Exciton Condensation in Double-Layer   Graphene
  We examine the influence of remote bands on the tendency toward exciton condensation in a system consisting of two parallel graphene layers with negligible interlayer tunneling. We find that the remote bands can play a crucial supporting role, especially at low carrier densities, and comment on some challenges that arise in attempting quantitative estimates of condensation temperatures. 
M. P. Mink, A. H. MacDonald, H. T. C. Stoof, and R. A. Duine
cond-mat.mes-hall