Bruno Amorim, Jürgen Schiefele, Fernando Sols, Francisco Guinea
We consider the drag effect between charge carriers in two spatially separated monoatomic graphene layers embedded in hexagonal boron nitride. Commonly, the phenomenon is described in terms of an interlayer Coulomb interaction. We show that if an additional electron -- electron interaction via exchange of virtual substrate phonons is included in the model, the temperature dependence of the predicted drag resistivity is modified considerably at temperatures above 150 K. The anisotropic crystal structure of boron nitride, with strong intralayer and comparatively weak interlayer bonds, is found to play an important role in this effect.
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http://arxiv.org/abs/1206.0308
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