Breakdown of Luttinger's theorem in two-orbital Mott insulators
Strongly Correlated Electrons
2009-11-11 v3
Abstract
An analysis of Luttinger's theorem shows that -- contrary to recent claims -- it is not valid for a generic Mott insulator. For a two-orbital Hubbard model with two electrons per site the crossover from a non-magnetic correlated insulating phase (Mott or Kondo insulator) to a band insulator is investigated. Mott insulating phases are characterized by poles of the self-energy and corresponding zeros in the Greens functions defining a ``Luttinger surface'' which is absent for band insulators. Nevertheless, the ground states of such insulators with two electrons per unit cell are adiabatically connected.
Cite
@article{arxiv.cond-mat/0602656,
title = {Breakdown of Luttinger's theorem in two-orbital Mott insulators},
author = {A. Rosch},
journal= {arXiv preprint arXiv:cond-mat/0602656},
year = {2009}
}
Comments
published version, some formulations changed