Band gaps in incommensurable graphene on hexagonal boron nitride

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Abstract

Devising ways of opening a band gap in graphene to make charge-carrier masses finite is essential for many applications. Recent experiments with graphene on hexagonal boron nitride (h-BN) offer tantalizing hints that the weak interaction with the substrate is sufficient to open a gap, in contradiction of earlier findings. Using many-body perturbation theory, we find that the small observed gap is what remains after a much larger underlying quasiparticle gap is suppressed by incommensurability. The sensitivity of this suppression to a small modulation of the distance separating graphene from the substrate suggests ways of exposing the larger underlying gap.
Original languageEnglish
Article number201404
JournalPhysical Review B
Volume89
Issue number20
DOIs
Publication statusPublished - 19 May 2014

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