Ralf Bulla, University of Augsburg
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Dynamical properties of strongly correlated electrons -
a Numerical Renormalization Group Approach
<br><br>Abstract<br><br>The Numerical Renormalization Group method (NRG) has been invented
by Wilson for the Kondo model and has been successfully applied
to a variety of impurity problems. This method allows for an
accurate calculation of both static and dynamic properties,
and can be used to investigate
the effective impurity models arising in the Dynamical
Mean Field Theory. In my talk, I will discuss recent
NRG-results for the zero-temperature metal-insulator transition
in the Hubbard model.
The results are in good quantitative agreement with the
Projective Self-Consistent Method and Quantum-Monte Carlo
calculations and show an isolation of the quasiparticle peak
near the transition which is also seen in the Iterated
Perturbation Theory. I will also discuss recent generalizations
of the NRG-approach: the metal-insulator transition at finite
temperatures and heavy-fermion behaviour in the Periodic
Anderson model.