Geometric magnetoconductance dips by edge roughness in graphene nanoribbons
Condensed Matter Physics Laboratory, Heinrich-Heine-Universität - Universitätsstr.1, 40225 Düsseldorf, Germany, EU
2 Solid State Electronics, Department of Science and Technology, Linköping University 60174 Norrköping, Sweden, EU
Accepted: 7 December 2011
The magnetoconductance of graphene nanoribbons with rough zigzag and armchair edges is studied by numerical simulations. Nanoribbons with sufficiently small bulk disorder show a pronounced magnetoconductance minimum at cyclotron radii close to the ribbon width, in close analogy to the wire peak observed in conventional semiconductor quantum wires. In zigzag nanoribbons, this feature becomes visible only above a threshold amplitude of the edge roughness, as a consequence of the reduced current density close to the edges.
PACS: 81.05.ue – Graphene / 73.23.-b – Electronic transport in mesoscopic systems / 72.10.Fk – Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect)
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