Electronic transport in disordered graphene superlattices with scale-free correlated barrier spacements

A. Barbosa,J. Lima,'Icaro S. F. Bezerra,M. Lyra

Published 2020 in Physica E-low-dimensional Systems & Nanostructures

ABSTRACT

Abstract A transfer matrix approach is used to study the electronic transport in graphene superlattices with long-range correlated barrier spacements. By considering the low-energy electronic excitations as massless Dirac fermions, we compute by transmission spectra of graphene superlattices with potential barriers having spacements randomly distributed with long-range correlations governed by a power-law spectral density S ( k ) ∝ 1 ∕ k α . We show that at large incidence angles, the correlations in the disorder distribution do not play a significant role in the electronic transmission. However, long-range correlations suppress the Anderson localization as normal incidence is approached and a band of transmitting modes sets up reminiscent of Klein tunneling.

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