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• W2080472302 abstract "The $tensuremath{-}J$ and Heisenberg models are truncated expansions of a canonically transformed Hubbard model coinciding with it at $Uensuremath{rightarrow}ensuremath{infty}$. We show that a modified canonical transformation applied to the Hubbard model leads to alternative models of similar form but whose convergence properties with respect to the expansion are more favorable, resulting in a good description of the half-filled ground state even at $0<Uensuremath{le}1$. We investigate the transformed Hamiltonian and observables for metallic and insulating variational wave functions." @default.
• W2080472302 created "2016-06-24" @default.
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• W2080472302 date "2008-07-29" @default.
• W2080472302 modified "2023-10-18" @default.
• W2080472302 title "Parametrized canonical transformation for the Hubbard model at arbitrary interaction strength" @default.
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• W2080472302 doi "https://doi.org/10.1103/physrevb.78.033110" @default.
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