Ferromagnetism in multi--band Hubbard models: From weak to strong Coulomb repulsion

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dc.creatorPenc, Karlo
dc.creatorShiba, Hiroyuki
dc.creatorMila, Frédéric
dc.creatorTsukagoshi, Takuya
dc.date1996-03-06
dc.date.accessioned2026-07-07T12:47:17Z
dc.date.available2026-07-07T12:47:17Z
dc.descriptionWe propose a new mechanism which can lead to ferromagnetism in Hubbard models containing triangles with different on-site energies. It is based on an effective Hamiltonian that we derive in the strong coupling limit. Considering a one-dimensional realization of the model, we show that in the quarter-filled, insulating case the ground-state is actually ferromagnetic in a very large parameter range going from Tasaki's flat-band limit to the strong coupling limit of the effective Hamiltonian. This result has been obtained using a variety of analytical and numerical techniques. Finally, the same results are shown to apply away from quarter-filling, in the metallic case.
dc.description12 pages, revtex, 12 figures,needs epsf and multicol style files
dc.identifierhttps://arxiv.org/abs/cond-mat/9603042
dc.identifierhttp://arxiv.org/abs/cond-mat/9603042
dc.identifierPhys. Rev. B 54, 4056 (1996)
dc.identifierdoi:10.1103/PhysRevB.54.4056
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/221667
dc.subjectCondensed Matter
dc.titleFerromagnetism in multi--band Hubbard models: From weak to strong Coulomb repulsion
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