Static Screening and Delocalization Effects in the Hubbard-Anderson Model
Disordered Systems and Neural Networks
2012-02-07 v2 Strongly Correlated Electrons
Abstract
We study the suppression of electron localization due to the screening of disorder in a Hubbard-Anderson model. We focus on the change of the electron localization length at the Fermi level within a static picture, where interactions are absorbed into the redefinition of the random on-site energies. Two different approximations are presented, either one yielding a nonmonotonic dependence of the localization length on the interaction strength, with a pronounced maximum at an intermediate interaction strength. In spite of its simplicity, our approach is in good agreement with recent numerical results.
Cite
@article{arxiv.0707.1301,
title = {Static Screening and Delocalization Effects in the Hubbard-Anderson Model},
author = {P. Henseler and J. Kroha and B. Shapiro},
journal= {arXiv preprint arXiv:0707.1301},
year = {2012}
}
Comments
7 pages, 5 figures, to be published in Phys. Rev. B, journal version