Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 95: Graphene IV: Electronic Properties and Structure

O 95.4: Vortrag

Freitag, 11. März 2016, 11:15–11:30, S051

Layer symmetry breaking field and conductivity in graphene twist bilayer — •Nicolas Ray, Sam Shallcross, and Oleg Pankratov — Lehrstuhl für theoretische Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7 B2, 91058 Erlangen, Germany

The rich electronic structure of the graphene twist bilayer includes both a decoupled large angle limit and a strongly coupled small angle limit [1]. We consider the in-plane conductivity via a linearised Boltzmann equation [2] over the full angle range, both with and without a layer-perpendicular electric field. The layer perpendicular electric field is shown to lead to a strong suppression of conductivity at certain "hot spots" in the twist angle and energy phase space.

[1] S. Shallcross et al., Phys. Rev. B 87, 245403, 2013; [2] E. Mariani et al., Phys. Rev. B 86, 165448, 2012.