English Electronic properties of graphene Cited by user Antony-22 on 06 Sep 2017 Graphene is a zero-gap semiconductor, because its conduction and valence bands meet at the Dirac points.
English Graphene Cited by user 91.225.19.225 on 17 Jan 2017 Graphene is a semi-metal with a small overlap between the valence and the conduction bands (zero bandgap material).