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Type: Artigo de periódico
Title: Non-gaussian Spatial Correlations Dramatically Weaken Localization.
Author: Javan Mard, H
Andrade, E C
Miranda, E
Dobrosavljević, V
Abstract: We perform variational studies of the interaction-localization problem to describe the interaction-induced renormalizations of the effective (screened) random potential seen by quasiparticles. Here we present results of careful finite-size scaling studies for the conductance of disordered Hubbard chains at half-filling and zero temperature. While our results indicate that quasiparticle wave functions remain exponentially localized even in the presence of moderate to strong repulsive interactions, we show that interactions produce a strong decrease of the characteristic conductance scale g^{*} signaling the crossover to strong localization. This effect, which cannot be captured by a simple renormalization of the disorder strength, instead reflects a peculiar non-Gaussian form of the spatial correlations of the screened disordered potential, a hitherto neglected mechanism to dramatically reduce the impact of Anderson localization (interference) effects.
Rights: aberto
Identifier DOI: 
Date Issue: 2015
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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