Anomalous Doping Effects on Charge Transport in Graphene Nanoribbons

Details Anomalous Doping Effects on Charge Transport in Graphene Nanoribbons Anomalous Doping Effects on Charge Transport in Graphene Nanoribbons

2009-02-16

arxiv.org/abs/0902.2730v1

Phys. Rev. Lett. 102, 096803 (2009)

Physics

Condensed Matter

Materials Science

Accepted in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.102.096803

We present first-principles calculations of quantum transport in chemically doped graphene nanoribbons with a width of up to 4 nm. The presence of boron and nitrogen impurities is shown to yield resonant backscattering, whose features are strongly dependent on the symmetry and the width of the ribbon, as well as the position of the dopants. Full suppression of backscattering is obtained on the pi-pi* plateau when the impurity preserves the mirror symmetry of armchair ribbons. Further, an unusual acceptor-donor transition is observed in zig-zag ribbons. These unconventional doping effects could be used to design novel types of switching devices.

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