Enhancement of electron-hole superfluidity in double few-layer graphene
  We propose two coupled electron-hole sheets of few-layer graphene as a new nanostructure to observe superfluidity at enhanced densities and enhanced transition temperatures. For ABC stacked few-layer graphene we show that the strongly correlated electron-hole pairing regime is readily accessible experimentally using current technologies. We find for double trilayer and quadlayer graphene sheets spatially separated by a nano-thick hexagonal boron-nitride insulating barrier, that the transition temperature for electron-hole superfluidity can approach temperatures of 40 K. 
M. Zarenia, A. Perali, D. Neilson, and F. M. Peeters
cond-mat.supr-con cond-mat.mes-hall