Existence of the Spin-Wave Gap in a Deformed Flat-Band Hubbard Model

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dc.creatorHomma, Makoto
dc.date2004-11-13
dc.date.accessioned2026-07-07T03:02:07Z
dc.date.available2026-07-07T03:02:07Z
dc.descriptionWe consider a deformed flat-band Hubbard model under a periodic boundary condition in arbitrary dimensions. We show that the ground state is only all-spin-up or -down state. We obtain upper and lower bounds of the one-magnon spin-wave energy with an arbitrary momentum. This dispersion relation is the same as that in the XXZ model in the certain parameter region. Therefore the spin wave has a finite energy gap. These results suggests the our model and the XXZ model.
dc.description30 pages, 1 figure
dc.identifierhttps://arxiv.org/abs/cond-mat/0411362
dc.identifierhttp://arxiv.org/abs/cond-mat/0411362
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/25281
dc.subjectStrongly Correlated Electrons
dc.subjectMathematical Physics
dc.titleExistence of the Spin-Wave Gap in a Deformed Flat-Band Hubbard Model
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