Orbital-selective Mott-Hubbard transition in the two-band Hubbard model
Abstract
Recent advances in the field of quantum Monte Carlo simulations for impurity problems allow --within dynamical mean field theory-- for a more thorough investigation of the two-band Hubbard model with narrow/wide band and SU(2)-symmetric Hund's exchange. The nature of this transition has been controversial, and we establish that an orbital-selective Mott-Hubbard transition exists. Thereby, the wide band still shows metallic behavior after the narrow band became insulating -not a pseudogap as for an Ising Hund's exchange. The coexistence of two solutions with metallic wide band and insulating or metallic narrow band indicates, in general, first-order transitions.
Cite
@article{arxiv.cond-mat/0504040,
title = {Orbital-selective Mott-Hubbard transition in the two-band Hubbard model},
author = {R. Arita and K. Held},
journal= {arXiv preprint arXiv:cond-mat/0504040},
year = {2007}
}
Comments
4 pages, 3 figures; 2nd version as published in Phys. Rev. B (R); minor corrections, putting more emphasis on differences in spectra when comparing SU(2) and Ising Hund's exchange