Dynamical Mean Field Study of the Two-Dimensional Disordered Hubbard Model
Strongly Correlated Electrons
2009-11-13 v2 Disordered Systems and Neural Networks
Abstract
We study the two-dimensional paramagnetic Anderson-Hubbard model using an extension of dynamical mean-field theory that allows us to treat disorder and strong electronic correlations on equal footing. We investigate the scaling of the inverse participation ratio at quarter- and half-filling and find a nonmonotonic dependence of the localization length on the interaction strength. We do not find evidence for an insulator-metal transition. The disorder potential becomes unscreened near the Mott transition. Furthermore, strong correlations suppress the Altshuler-Aronov density of states anomaly near half-filling.
Cite
@article{arxiv.0707.0791,
title = {Dynamical Mean Field Study of the Two-Dimensional Disordered Hubbard Model},
author = {Yun Song and R. Wortis and W. A. Atkinson},
journal= {arXiv preprint arXiv:0707.0791},
year = {2009}
}
Comments
5 pages, 4 figures. Revised version, In Press Phys. Rev. B