Conductance quantization and transport gap in disordered graphene nanoribbons

Details Conductance quantization and transport gap in disordered graphene nanoribbons Conductance quantization and transport gap in disordered graphene nanoribbons

2008-06-23

arxiv.org/abs/0806.3777v2

Phys. Rev. B 79, 075407 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 7 figures; references added, typos fixed, to appear in Phys. Rev B

Scientific paper

10.1103/PhysRevB.79.075407

We study numerically the effects of edge and bulk disorder on the conductance of graphene nanoribbons. We compute the conductance suppression due to localization induced by edge scattering. We find that even for weak edge roughness, conductance steps are suppressed and transport gaps appear. These gaps are approximately inversely proportional to the nanoribbon width. On/off conductance ratios grow exponentially with the nanoribbon length. Our results impose severe limitations to the use of graphene in ballistic nanowires.

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