Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 83: [TT] Transport: Graphene 2 (jointly with MA, HL, DY, DS, O)
O 83.10: Vortrag
Freitag, 30. März 2012, 12:00–12:15, BH 334
Localization behavior of Dirac particles in disordered graphene superlattices — Qifang Zhao1, Jiangbin Gong1, and •Cord Müller2 — 1Department of Physics and Centre for Computational Science and Engineering, National University of Singapore — 2Centre for Quantum Technologies, National University of Singapore
Graphene superlattices (GSLs) can be used to engineer band structures and, from there, charge transport properties, but these are sensitive to the presence of disorder. We study the localization behavior of massless 2D Dirac particles induced by weak disorder for both scalar-potential and vector-potential GSLs. By an analytical weak-disorder expansion, we investigate how the localization length depends on the incidence angle to a 1D GSL. Delocalization resonances are found for both scalar and vector GSLs. The sharp angular dependence of the Lyapunov exponent may be exploited to realize disorder-induced filtering devices [1].
Q. Zhao, J. Gong, and C. A. Müller, arXiv:1111.3436