Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/85642
Type: Artigo
Title: Non-gaussian spatial correlations dramatically weaken localization
Author: Mard, H. J.
Andrade, E. C.
Miranda, E.
Dobrosavljevic, 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.
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.
Subject: Poços quânticos
Função de onda
Country: Estados Unidos
Editor: American Physical Society
Citation: Physical Review Letters. American Physical Society, v. 114, n. 5, p. - , 2015.
Rights: aberto
Identifier DOI: 10.1103/PhysRevLett.114.056401
Address: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.056401
Date Issue: 2015
Appears in Collections:IFGW - Artigos e Outros Documentos

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