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Title: Localization behavior of Dirac particles in disordered graphene superlattices
Authors: Zhao, Q.
Gong, J. 
Müller, C.A.
Issue Date: 2-Mar-2012
Citation: Zhao, Q., Gong, J., Müller, C.A. (2012-03-02). Localization behavior of Dirac particles in disordered graphene superlattices. Physical Review B - Condensed Matter and Materials Physics 85 (10) : -. ScholarBank@NUS Repository.
Abstract: Graphene superlattices (GSLs), formed by subjecting a monolayer graphene sheet to a periodic potential, can be used to engineer band structures and, from there, charge transport properties, but these are sensitive to the presence of disorder. The localization behavior of massless 2D Dirac particles induced by weak disorder is studied for both scalar-potential and vector-potential GSLs, computationally as well as analytically by a weak-disorder expansion. In particular, it is investigated how the Lyapunov exponent (inverse 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, as verified by full 2D numerical wave packet simulations. © 2012 American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
ISSN: 10980121
DOI: 10.1103/PhysRevB.85.104201
Appears in Collections:Staff Publications

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