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Gap Opening by Asymmetric Doping in Graphene Bilayers

We study the energy gap opening in the electronic spectrum of graphene bilayers caused by asym- metric doping. Both substitutional impurities (boron acceptors and nitrogen donors) and adsorbed potassium donors are considered. The gap evolution with dopant concentration is compared to the situation in which the asymmetry between the layers is induced by an external electric field. The effects of adsorbed potassium are similar to that of an electric field, but substitutional impurities behave quite differently, showing smaller band gaps and a large sensitivity to disorder and sublattice occupation.

preprint2010arXivOpen access
Marcos G. MenezesRodrigo B. CapazJorge L. B. Faria
cond-mat.mes-hall
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Open access3 authors1 topic
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Marcos G. MenezesRodrigo B. CapazJorge L. B. Faria

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