Delocalization due to correlations in two-dimensional disordered systems
强关联电子
2009-11-10 v2 无序系统与神经网络
介观与纳米尺度物理
摘要
We study the spectral statistics of interacting spinless fermions in a two-dimensional disordered lattice. Within a full quantum treatment for small few-particle-systems, we compute the low-energy many-body states numerically. While at weak disorder the interactions reduce spectral correlations and lead to localization, for the case of strong disorder we find that a moderate Coulomb interaction has a delocalizing effect. In addition, we observe a non-universal structure in the level-spacing distribution which we attribute to a mechanism reinforcing spectral correlations taking place in small systems at strong disorder.
引用
@article{arxiv.cond-mat/0406758,
title = {Delocalization due to correlations in two-dimensional disordered systems},
author = {Gabriel Vasseur and Dietmar Weinmann},
journal= {arXiv preprint arXiv:cond-mat/0406758},
year = {2009}
}
备注
6 pages, 4 figures, corrected typos