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Andreas Mielke: Ferromagnetism in single band Hubbard models with a partially flat band
Phys. Rev. Lett.82,
AbstractA 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.
title="Ferromagnetism in single band Hubbard models with a partially flat band",
journal="Phys. Rev. Lett.",
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