Parts | Days | Selection | Search | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 20: Correlated Electrons - Poster Session
TT 20.21: Poster
Wednesday, March 28, 2007, 14:00–17:45, Poster A
Quantum Monte-Carlo scheme for the solution of the Kondo impurity problem with an arbitrary density of free electron states — •Evgeny Gorelov1,2, Andrey Zhuravlev1,3, Alexey Rubtsov4, and Alexander Lichtenstein1 — 1I. Institut für theoretische Physik, Universität Hamburg, Jungiusstrasse 9, 20355 Hamburg — 2Theoretical Physics and Applied Mathematics Department, Urals State Technical University, Mira Street 19, 620002 Ekaterinburg, Russia — 3Institute of Metal Physics, 620219 Ekaterinburg, Russia — 4Department of Physics, Moscow State University, 119992 Moscow, Russia
The numerically exact determinantal continuous time QMC method has been applied to calculate properties of a Kondo impurity coupled to a band of free electrons with an arbitrary density of states (DOS). This approach allows to calculate spin susceptibilities as well as Green functions, accurately taking into account all the peculiarities of the free electron DOS. The method was applied to a Kondo impurity embedded into different environments: ultrasmall grain, Anderson model (lattice with random on-site energy levels) and a 2-dimensional lattice, where the DOS has a van Hove singularity.