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Electronic and transport properties of unbalanced sublattice N-doping in graphene
Aurélien Lherbier1, Andrés Rafael Botello-Méndez, Jean-Christophe Charlier
1Institute of Condensed Matter and Nanosciences (IMCN), Université catholique de Louvain (UCL), 1348 Louvain-la-Neuve, Belgium. aurelien.lherbier@uclouvain.be
Abstract:
Using both first-principles techniques and a real-space Kubo-Greenwood approach, electronic and transport properties of nitrogen-doped graphene with a single sublattice preference are investigated. Such a breaking of the sublattice symmetry leads to the appearance of a true band gap in graphene electronic spectrum even for a random distribution of the N dopants. More surprisingly, a natural spatial separation of both types of charge carriers at the band edge is predicted, leading to a highly asymmetric electronic transport. Both the presence of a band gap, allowing large on/off ratio, and an asymmetric transport pave a new route toward efficient graphene-based field-effect transistors.
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