Mott Transition in Degenerate Hubbard Models: Application to Doped Fullerenes
Condensed Matter
2009-10-28 v1
Abstract
The Mott-Hubbard transition is studied for a Hubbard model with orbital degeneracy N, using a diffusion Monte-Carlo method. Based on general arguments, we conjecture that the Mott-Hubbard transition takes place for U/W \propto \sqrt{N}, where U is the Coulomb interaction and W is the band width. This is supported by exact diagonalization and Monte-Carlo calculations. Realistic parameters for the doped fullerenes lead to the conclusion that stoichiometric A_3 C_60 (A=K, Rb) are near the Mott-Hubbard transition, in a correlated metallic state.
Keywords
Cite
@article{arxiv.cond-mat/9608107,
title = {Mott Transition in Degenerate Hubbard Models: Application to Doped Fullerenes},
author = {Olle Gunnarsson and Erik Koch and Richard M. Martin},
journal= {arXiv preprint arXiv:cond-mat/9608107},
year = {2009}
}
Comments
4 pages, revtex, 1 eps figure included, to be published in Phys.Rev.B Rapid Comm