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Título:
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Localization on a two-channel model with cross-correlated disorder
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Autores:
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Carvalho, R.C.P. ;
Lyra, M. L. ;
de Moura, F.A.B.F. ;
Domínguez-Adame Acosta, Francisco
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Tipo de documento:
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texto impreso
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Editorial:
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IOP Publishing Ltd., 2011-05-04
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física de materiales
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Materia = Ciencias: Física: Física del estado sólido
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Tipo = Artículo
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Resumen:
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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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En línea:
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https://eprints.ucm.es/id/eprint/31063/1/Dguez-Adame17POSTPRINT.pdf
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