Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 30: Postersitzung IV: Kritische Ph
änomene, Quantenstörstellen, niederdimensionale Systeme

TT 30.3: Poster

Donnerstag, 11. März 2004, 14:30–19:00, Poster A

Numerical Renormalization Group for the Bose-Fermi Kondo Model — •Tae-Hyoung Gimm and Ralf Bulla — Theoretische Physik III, Universität Augsburg

Wilson’s numerical renormalization group (NRG) method is a powerful tool for the investigations of quantum impurity systems. It was originally developed for the Kondo problem to study the physics of a magnetic impurity in a fermionic bath. Recently, the NRG was successfully applied to a simple two state system with a bosonic bath, that is, the spin-boson model. Here we consider the Ising Bose-Fermi Kondo model, which describes a magnetic impurity simultaneously coupled to both a fermionic and a bosonic bath. When the Kondo lattice system is analyzed within an extended dynamical mean field theory, the Kondo lattice Hamiltonian is mapped onto an effective single-site problem and represented by the Bose-Fermi Kondo Hamiltonian. We present a progress report of our NRG investigation of the Bose-Fermi Kondo model with Ising anisotropy for the boson field.