Room-Temperature Superfluidity in Graphene Bilayers
  Because graphene is an atomically two-dimensional gapless semiconductor with nearly identical conduction and valence bands, graphene-based bilayers are attractive candidates for high-temperature electron-hole pair condensation. We present estimates which suggest that the Kosterlitz-Thouless temperatures of these two-dimensional counterflow superfluids can approach room temperature. 
Hongki Min, Rafi Bistritzer, Jung-Jung Su and A.H. MacDonald (These   authors contributed equally to this work.)