Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena

TT 6.39: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

Comparison between NRG and DMRG as impurity solver — •Robert Peters, Piet Dargel, and Thomas Pruschke — Friedrich Hund Platz 1, 37077 Goettingen

Impurity models like the Anderson model play an important part in strong correlation physics. They model the situation of localized, partially filled f- or d-shells in metals and artificially produced quantum dots or Qubits. Also strongly correlated lattice models, like e.g. the Hubbard model, can be mapped via dynamical mean field theory on a self-consistency calculation of an impurity model. In recent years the Density Matrix Renormalization Group (DMRG) was introduced as novel method to solve such impurity problems. We here compare results for static and dynamic properties of quantum impurities obtained with DMRG to those from the well-established Numerical Renormalization Group (NRG). Special emphasis will be put on the possible application of DMRG to systems with multiple orbitals or multiple impurities.