Low-temperature thermodynamics for a flat-band ferromagnet: Rigorous versus numerical results

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dc.creatorDerzhko, Oleg
dc.creatorHonecker, Andreas
dc.creatorRichter, Johannes
dc.date2007-03-12
dc.date2007-11-11
dc.date.accessioned2026-07-07T08:47:46Z
dc.date.available2026-07-07T08:47:46Z
dc.descriptionThe repulsive Hubbard model on a sawtooth chain exhibits a lowest single-electron band which is completely dispersionless (flat) for a specific choice of the hopping parameters. We construct exact many-electron ground states for electron fillings up to 1/4. We map the low-energy degrees of freedom of the electron model to a model of classical hard dimers on a chain and, as a result, obtain the ground-state degeneracy as well as closed-form expressions for the low-temperature thermodynamic quantities around a particular value of the chemical potential. We compare our analytical findings with complementary numerical data. Although we consider a specific model, we believe that some of our results like a low-temperature peak in the specific heat are generic for flat-band ferromagnets.
dc.description5 pages, 1 figure; accepted for publication as a Rapid Communication in Physical Review B
dc.identifierhttps://arxiv.org/abs/cond-mat/0703295
dc.identifierhttp://arxiv.org/abs/cond-mat/0703295
dc.identifierPhys. Rev. B 76, 220402(R) (2007)
dc.identifierdoi:10.1103/PhysRevB.76.220402
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/143715
dc.subjectStrongly Correlated Electrons
dc.titleLow-temperature thermodynamics for a flat-band ferromagnet: Rigorous versus numerical results
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