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Localization on a two-channel model with cross-correlated disorder

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Carvalho, R.C.P. and Lyra, M. L. and de Moura, F.A.B.F. and Domínguez-Adame Acosta, Francisco (2011) Localization on a two-channel model with cross-correlated disorder. Journal of physics: Condensed matter, 23 (17). ISSN 0953-8984

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Official URL: http://dx.doi.org/10.1088/0953-8984/23/17/175304


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Abstract

We study the wavepacket dynamics in a two-channel Anderson model with correlated diagonal disorder. To impose correlations in the disorder distribution we construct the on-site energy landscape following both symmetric and antisymmetric rules. Our numerical data show that symmetric cross-correlations have a small impact on the degree of localization of the one-particle eigenstates. In contrast, antisymmetric correlations lead to a reduction of the effective degree of disorder, thus resulting in a substantial increase of the wavepacket spread. A finite-size scaling analysis shows that the antisymmetric cross-correlations, in spite of weakening the localization, do not promote ballistic transport. The present results shed light on recent findings concerning an apparent delocalization transition in a correlated DNA-like ladder model.


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©IOP Publishing Ltd.
This work was partially financed by the Brazilian Research Agencies CAPES (PROCAD, Rede NanoBioestruturas), CNPq (INCT-Nano(Bio)Simes, Project no. 573925/2008-9) and FAPERN/CNPq (Pronex). Work at Madrid was supported by MEC (projects MOSAICO and MAT2010-17180). FABF de Moura would like to thank the hospitality of Departamento de Física de Materiales (UCM).

Uncontrolled Keywords:Random-cimer model; Delocalization transition; Anderson model; Mobility edge; Absence; Chains
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:31063
Deposited On:25 Jun 2015 14:51
Last Modified:26 Jun 2015 08:18

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