Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Correlated Electrons - Poster Session

TT 20.21: Poster

Mittwoch, 28. März 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 Gorelov^1,2, Andrey Zhuravlev^1,3, 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.