Non-Gaussian Spatial Correlations Dramatically Weaken Localization
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.
Cite
@article{arxiv.1309.0475,
title = {Non-Gaussian Spatial Correlations Dramatically Weaken Localization},
author = {Hossein Javan Mard and Eric C. Andrade and Eduardo Miranda and Vladimir Dobrosavljević},
journal= {arXiv preprint arXiv:1309.0475},
year = {2015}
}
Comments
5 pages, 5 figures. Supplemental Material: 6 pages, 11 figures