Ground state energy of the Hubbard model: cluster-perturbative results

Details Ground state energy of the Hubbard model: cluster-perturbative results Ground state energy of the Hubbard model: cluster-perturbative results

1998-02-16

arxiv.org/abs/cond-mat/9802171v1

Phys. Rev. B 57, 8755 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 eps figures, revtex, epsf, accepted for publication in Phys.Rev.B

Scientific paper

10.1103/PhysRevB.57.8755

When electron correlations are important it is often necessary to use numerical methods to solve the Hamiltonian for a finite system (cluster) "exactly". Unfortunately, such methods are restricted to small systems. We propose to combine the "exact" numerical diagonalization for small clusters with the perturbative calculations to take into account the intracluster as well as intercluster interactions.

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