Parametrized canonical transformation for the Hubbard-model at arbitrary interaction strength

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dc.creatorHetenyi, Balazs
dc.creatorEvertz, Hans Gerd
dc.date2008-06-24
dc.date2008-07-27
dc.date.accessioned2026-07-07T09:53:26Z
dc.date.available2026-07-07T09:53:26Z
dc.descriptionThe $t-J$ and Heisenberg models are truncated expansions of a canonically transformed Hubbard model coinciding with it at $U\to \infty$. We show that a modified canonical transformation applied to the Hubbard model leads to alternative models of the same form, but whose convergence properties with respect to the expansion are more favourable, resulting in a good description of the half-filled ground state even at $0<U\leq1$. We investigate the transformed Hamiltonian and observables for metallic and insulating variational wave-functions.
dc.descriptionto appear in Physical Review B (Brief reports) added author names and addresses (which were missing in the first version) revised version: 1. There was an error in Fig. 2, now fixed. 2. Minor text revisions
dc.identifierhttps://arxiv.org/abs/0806.3848
dc.identifierhttp://arxiv.org/abs/0806.3848
dc.identifierPhys. Rev. B 78, 033110 (2008).
dc.identifierdoi:10.1103/PhysRevB.78.033110
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/165950
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleParametrized canonical transformation for the Hubbard-model at arbitrary interaction strength
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