Ferromagnetism in single-band Hubbard models with a partially flat band
Strongly Correlated Electrons
2009-10-31 v1 Mathematical Physics
math.MP
Abstract
A Hubbard model with a single, partially flat band has ferromagnetic ground states. It is shown that local stability of ferromagnetism implies its global stability in such a model: The model has only ferromagnetic ground states if there are no single spin-flip ground states. Since a single-band Hubbard model away from half filling describes a metal, this result may open a route to metallic ferromagnetism in single band Hubbard models.
Cite
@article{arxiv.cond-mat/9904258,
title = {Ferromagnetism in single-band Hubbard models with a partially flat band},
author = {Andreas Mielke},
journal= {arXiv preprint arXiv:cond-mat/9904258},
year = {2009}
}
Comments
6 pages, Accepted for publication in Physical Review Letters