title: Electron transport in disordered graphene nanoribbons.
abstract: 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.
authors.affiliation: Department of Physics and Department of Applied Physics, Columbia University, New York, New York 10027, USA.
authors.forename: Melinda Y
authors.initials: MY
authors.lastname: Han
authors.forename: Juliana C
authors.initials: JC
authors.lastname: Brant
authors.forename: Philip
authors.initials: P
authors.lastname: Kim