Delocalization due to correlations in two-dimensional disordered systems

Details Delocalization due to correlations in two-dimensional disordered systems Delocalization due to correlations in two-dimensional disordered systems

2004-06-30

arxiv.org/abs/cond-mat/0406758v2

Eur. Phys. J. B 42 (2004) p. 279-284

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures, corrected typos

Scientific paper

10.1140/epjb/e2004-00380-9

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.

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