A Cluster Method for Spectral Properties of Correlated Electrons
نویسنده
چکیده
Some technical aspects of Cluster Perturbation Theory (CPT) are presented. CPT is an approximation scheme for calculating the oneparticle Green function of the Hubbard model of interacting electrons on a lattice. It proceeds by (i) dividing the lattice into identical clusters and calculating the Green function by exact diagonalization on a given cluster (ii) extending this Green function to the whole lattice by using Dyson’s equation. The exact diagonalization technique for the Hubbard model is explained in some detail. Embedding the cluster in the full lattice is then discussed, and two alternate emdedding schemes are briefly described.
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