Conductance of disordered graphene superlattice

Details Conductance of disordered graphene superlattice Conductance of disordered graphene superlattice

2008-09-26

arxiv.org/abs/0809.4578v2

Phys. Rev. B 79, 165412 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 7 figures. Final version, to appear in Phys. Rev. B (2009)

Scientific paper

We study the conductance of disordered graphene superlattices with short-range structural correlations. The system consists of electron- and hole-doped graphenes of various thicknesses, which fluctuate randomly around their mean value. The effect of the randomness on the probability of transmission through the system of various sizes is studied. We show that in a disordered superlattice the quasiparticle that approaches the barrier interface almost perpendicularly transmits through the system. The conductivity of the finite-size system is computed and shown that the conductance vanishes when the sample size becomes very large, whereas for some specific structures the conductance tends to a nonzero value in the thermodynamics limit.

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