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Conductance enhancement due to atomic potential fluctuations in graphene

We solve the Dirac equation, which describes charge massless chiral relativistic carriers in a two-dimensional graphene. We have identified and analysed a novel pseudospin-dependent scattering effect. We compute the tunneling conductance and generalize the analytical result in the presence of the tunable atomic potential of a graphene strip. The absence of back scattering in graphene is shown to be due to Berry's phase which corresponds to a sign change of the wave function under a spin rotation of a particle. We use the transfer matrix approach and find that the electric conductance of doped graphene increases due to atomic potential fluctuations.

preprint2012arXivOpen access
Dima BolmatovD. V. Zavialov
cond-mat.mes-hall
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Dima BolmatovD. V. Zavialov

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