Disorder and Interaction in 2D: Exact diagonalization study of the Anderson-Hubbard-Mott model
Strongly Correlated Electrons
2009-10-31 v2
Abstract
We investigate, by numerically calculating the charge stiffness, the effects of random diagonal disorder and electron-electron interaction on the nature of the ground state in the 2D Hubbard model through the finite size exact diagonalization technique. By comparing with the corresponding 1D Hubbard model results and by using heuristic arguments we conclude that it is \QTR{it}{unlikely} that there is a 2D metal-insulator quantum phase transition although the effect of interaction in some range of parameters is to substantially enhance the non-interacting charge stiffness.
Keywords
Cite
@article{arxiv.cond-mat/0002304,
title = {Disorder and Interaction in 2D: Exact diagonalization study of the Anderson-Hubbard-Mott model},
author = {R. Kotlyar and S. Das Sarma},
journal= {arXiv preprint arXiv:cond-mat/0002304},
year = {2009}
}
Comments
13 pages, 2 figures Revised version. Accepted for publication in Phys. Rev. Lett