Non-Gaussian Spatial Correlations Dramatically Weaken Localization

Autor(es)

Mard, H. Javan ^{[1, 2]} ; Andrade, E. C. ^[3] ; Miranda, E. ^[4] ; Dobrosavljevic, V. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Florida State Univ, Dept Phys, Tallahassee, FL 32306 - USA

^[2] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32306 - USA

^[3] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden - Germany

^[4] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Physical Review Letters; v. 114, n. 5 FEB 3 2015.
• Citações Web of Science: 1

Resumo

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. (AU)

• Processo FAPESP: 07/57630-5 - Métodos não perturbativos aplicados a sistemas eletrônicos correlacionados
• Beneficiário: Eduardo Miranda
• Modalidade de apoio: Auxílio à Pesquisa - Temático