Ferromagnetism in single-band Hubbard models with a partially flat band

Details Ferromagnetism in single-band Hubbard models with a partially flat band Ferromagnetism in single-band Hubbard models with a partially flat band

1999-04-19

arxiv.org/abs/cond-mat/9904258v1

Phys. Rev. Lett.82, 4312-4315 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, Accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.82.4312

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.

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