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Phys Rev Lett. 2010 Feb 5;104(5):056801. Epub 2010 Feb 1.

Electron transport in disordered graphene nanoribbons.

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Department of Physics and Department of Applied Physics, Columbia University, New York, New York 10027, USA.


We report an electron transport study of lithographically fabricated graphene nanoribbons (GNRs) of various widths and lengths. At the charge neutrality point, a length-independent transport gap forms whose size is inversely proportional to the GNR width. In this gap, electrons are localized, and charge transport exhibits a transition between thermally activated behavior at higher temperatures and variable range hopping at lower temperatures. By varying the geometric capacitance, we find that charging effects constitute a significant portion of the activation energy.

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