Perfectly conducting channel and its robustness in disordered carbon nanostructures

Abstract

We report our recent numerical study on the effects of dephasing on a perfectly conducting channel (PCC), its presence believed to be dominant in the transport characteristics of a zigzag graphene nanoribbons (GNR) and of a metallic carbon nanotubes (CNT). Our data confirms an earlier prediction that a PCC in GNR exhibits a peculiar robustness against dephasing, in contrast to that of the CNT. By studying the behavior of the conductance as a function of the system's length we show that dephasing destroys the PCC in CNT, whereas it stabilizes the PCC in GNR. Such opposing responses of the PCC against dephasing stem from a different nature of the PCC in these systems.

6 pages, 3 figures, manuscript for the proceedings of Localisation 2011

References in corpus (4)

• Perfectly Conducting Channel and Universality Crossover in Disordered Nano-Graphene Ribbons
• Electronic transport properties of graphene nanoribbons
• Edge Effect on Electronic Transport Properties of Graphene Nanoribbons and Presence of Perfectly Conducting Channel
• Chalker-Coddington model described by an S-matrix with odd dimensions