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

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

2008-06-24

arxiv.org/abs/0806.3848v3

Phys. Rev. B 78, 033110 (2008).

Physics

Condensed Matter

Strongly Correlated Electrons

to appear in Physical Review B (Brief reports) added author names and addresses (which were missing in the first version) revi

Scientific paper

10.1103/PhysRevB.78.033110

The $t-J$ 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

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