Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 37.5: Talk

Friday, February 29, 2008, 11:15–11:30, H 2053

Coupled-Cluster Method for the Anderson Impurity Model — •Jin-Jun Liang, Clive Emary, and Tobias Brandes — Sekr. PN 7-1, Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, D-10623 BERLIN

The coupled-cluster method (CCM) is one of the most powerful and numerically accurate approximation methods for describing many-body quantum systems. It is popular in nuclear physics, quantum chemistry and quantum magnetism. However, the method has been rarely applied to models with continua, like the Anderson impurity model. In this talk, we will present our work on applying the CCM to the Fano-Anderson model and the Anderson model with Coulomb interaction. Results are mainly for ground state properties, including ground state energies and impurity occupation numbers. The method will also be compared with some other more traditional methods in quantum impurities, such as Green’s function and self-consistent perturbation theory.