Ruprecht-Karls-Universität Heidelberg
University of HeidelbergFaculty of Physics and AstronomyInstitut of Theoretical PhysicsAndreas MielkeAndreas Mielkeemail

Andreas Mielke
Institut for Theoretical Physics
Ruprecht-Karls University
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D-69120 Heidelberg
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Andreas Mielke: Ferromagnetism in single band Hubbard models with a partially flat band
Phys. Rev. Lett.82, 4312-4315 (1999) .

Archiv: cond-mat/9904258


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.


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

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