Flow equation approach to heavy fermion systems
Strongly Correlated Electrons
2009-11-10 v2
Abstract
We use Wegner's flow equation method to investigate the infinite- periodic Anderson model. We show that this method poses a new approach to the description of heavy fermion behaviour. Within this scheme we derive an effective Hamiltonian where the and degrees of freedom are decoupled. By evaluating one-particle energies as well as correlation functions we find an electronic structure which comprises two gapped quasiparticle bands. We also address the lattice Kondo temperature, which shows a typical exponential dependence on the hybridisation energy. This energy scale exhibits a significant decrease compared to that of the single impurity Anderson model.
Cite
@article{arxiv.cond-mat/0406264,
title = {Flow equation approach to heavy fermion systems},
author = {Karsten Meyer},
journal= {arXiv preprint arXiv:cond-mat/0406264},
year = {2009}
}