Ordered states in the disordered Hubbard model
Strongly Correlated Electrons
2015-06-25 v1 Disordered Systems and Neural Networks
Statistical Mechanics
Abstract
The Hubbard model is studied in which disorder is introduced by putting the on-site interaction to zero on a fraction f of (impurity) sites of a square lattice. Using Quantum Monte Carlo methods and Dynamical Mean Field theory we find that antiferromagnetic long-range order is initially enhanced at half-filling and stabilized off half-filling by the disorder. The Mott-Hubbard charge gap of the pure system is broken up into two pieces by the disorder: one incompressible state remains at average density n=1 and another can be seen slightly below n=1+f. Qualitative explanations are provided.
Cite
@article{arxiv.cond-mat/9805100,
title = {Ordered states in the disordered Hubbard model},
author = {P. J. H. Denteneer and M. Ulmke and R. T. Scalettar and G. T. Zimanyi},
journal= {arXiv preprint arXiv:cond-mat/9805100},
year = {2015}
}
Comments
17 pages, including 8 figures. Paper for Festschrift in honor of Hans van Leeuwen's 65th birthday