Electric-field-dependent localization in a superlattice

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Abstract
In this paper we study transport perpendicular to the layers of a disordered superlattice in the presence of an electric field. We use a recursive procedure based on the transfer-matrix method to obtain analytical results for the transmission coefficient. We find that the wave function is power-law localized and independent of the disorder in the asymptotic limit. A chain of delta-function potentials is also studied for comparison. In this case the wave function is found to be power-law localized with a disorder-dependent exponent.

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