Cluster diagonalization in systematically expanded Hilbert spaces: application to models of correlated electrons

Details Cluster diagonalization in systematically expanded Hilbert spaces: application to models of correlated electrons Cluster diagonalization in systematically expanded Hilbert spaces: application to models of correlated electrons

1993-08-19

arxiv.org/abs/cond-mat/9308027v1

Physics

Condensed Matter

26 pages + 12 figures, available upon request, LATEX, preprint ORNL/CCIP/93/7

Scientific paper

10.1103/PhysRevB.48.9515

A method of cluster diagonalization in a systematically expanded Hilbert space is described. We discuss some applications of this procedure to models of high-T_c superconductors, like the t - J and one and three bands Hubbard models in two dimensions. The results obtained with this method are compared against results obtained with other techniques dealing with truncated Hilbert spaces. The relation between this method of diagonalization in a reduced Hilbert space, and perturbation theory and variational techniques is also discussed.

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