Variational cluster approach to correlated electron systems in low dimensions

Details Variational cluster approach to correlated electron systems in low dimensions Variational cluster approach to correlated electron systems in low dimensions

2003-03-07

arxiv.org/abs/cond-mat/0303136v3

Phys. Rev. Lett. 91, 206402 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, final version with minor changes

Scientific paper

10.1103/PhysRevLett.91.206402

A self-energy-functional approach is applied to construct cluster approximations for correlated lattice models. It turns out that the cluster-perturbation theory (Senechal et al, PRL 84, 522 (2000)) and the cellular dynamical mean-field theory (Kotliar et al, PRL 87, 186401 (2001)) are limiting cases of a more general cluster method. Results for the one-dimensional Hubbard model are discussed with regard to boundary conditions, bath degrees of freedom and cluster size.

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