Quantum impurity models with the Coupled Cluster Method

Details Quantum impurity models with the Coupled Cluster Method Quantum impurity models with the Coupled Cluster Method

2009-06-25

arxiv.org/abs/0906.4684v1

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 2 figures

Scientific paper

We investigate the ground-state properties of the Anderson single impurity model (finite Coulomb impurity repulsion) with the Coupled Cluster Method. We consider different CCM reference states and approximation schemes and make comparison with exact Green's function results for the non-interacting model and with Brillouin-Wigner perturbation theory for the full interacting model. Our results show that coupled cluster techniques are well suited to quantum impurity problems.

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