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• W2003107311 abstract "The repulsive Hubbard model on a sawtooth chain exhibits the 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 such as a low-temperature peak in the specific heat are generic for flat-band ferromagnets." @default.
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• W2003107311 date "2007-12-06" @default.
• W2003107311 modified "2023-10-06" @default.
• W2003107311 title "Low-temperature thermodynamics for a flat-band ferromagnet: Rigorous versus numerical results" @default.
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• W2003107311 doi "https://doi.org/10.1103/physrevb.76.220402" @default.
• W2003107311 hasPublicationYear "2007" @default.
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