Nearly Perfect Single-Channel Conduction in Disordered Armchair Nanoribbons

Details Nearly Perfect Single-Channel Conduction in Disordered Armchair Nanoribbons Nearly Perfect Single-Channel Conduction in Disordered Armchair Nanoribbons

2009-02-07

arxiv.org/abs/0902.1234v1

Phys. Rev. B 79, 125421 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, accepted for publication in PRB

Scientific paper

10.1103/PhysRevB.79.125421

The low-energy spectrum of graphene nanoribbons with armchair edges (armchair nanoribbons) is described as the superposition of two non-equivalent Dirac points of graphene. In spite of the lack of well-separated two valley structures, the single-channel transport subjected to long-ranged impurities is nearly perfectly conducting, where the backward scattering matrix elements in the lowest order vanish as a manifestation of internal phase structures of the wavefunction. For multi-channel energy regime, however, the conventional exponential decay of the averaged conductance occurs. Since the inter-valley scattering is not completely absent, armchair nanoribbons can be classified into orthogonal universality class irrespective of the range of impurities. The nearly perfect single-channel conduction dominates the low-energy electronic transport in rather narrow nanorribbons.

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