Insulating behavior of an amorphous graphene membrane

Dinh Van Tuan, Avishek Kumar, Stephan Roche, Frank Ortmann, M. F. Thorpe, Pablo Ordejon

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    22 Citations (Scopus)

    Abstract

    We investigate the charge transport properties of planar amorphous graphene that is fully topologically disordered, in the form of sp2 threefold coordinated networks consisting of hexagonal rings but also including many pentagons and heptagons distributed in a random fashion. Using the Kubo transport methodology and the Lanczos method, the density of states, mean free paths, and semiclassical conductivities of such amorphous graphene membranes are computed. Despite a large increase in the density of states close to the charge neutrality point, all electronic properties are dramatically degraded, evidencing an Anderson insulating state caused by topological disorder alone. These results are supported by Landauer-Büttiker conductance calculations, which show a localization length as short as 5 nm. © 2012 American Physical Society.
    Original languageEnglish
    Article number121408
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume86
    Issue number12
    DOIs
    Publication statusPublished - 24 Sep 2012

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