Electron transport in disordered graphene nanoribbons.
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.
Han
Melinda Y
MY
Department of Physics and Department of Applied Physics, Columbia University, New York, New York 10027, USA.
Brant
Juliana C
JC
Kim
Philip
P