Mott transitions in correlated electron systems with orbital degrees of freedom
Strongly Correlated Electrons
2009-11-07 v2
Abstract
Mott metal-insulator transitions in an M-fold orbitally degenerate Hubbard model are studied by means of a generalization of the linearized dynamical mean-field theory. The method allows for an efficient and reliable determination of the critical interaction U_c for any integer filling n and different M at zero temperature. For half-filling a linear dependence of U_c on M is found. Inclusion of the (full) Hund's rule exchange J results in a strong reduction of U_c. The transition turns out to change qualitatively from continuous for J=0 to discontinuous for any finite J.
Keywords
Cite
@article{arxiv.cond-mat/0206508,
title = {Mott transitions in correlated electron systems with orbital degrees of freedom},
author = {Y. Ono and M. Potthoff and R. Bulla},
journal= {arXiv preprint arXiv:cond-mat/0206508},
year = {2009}
}