Flow equation approach to heavy fermion systems

Details Flow equation approach to heavy fermion systems Flow equation approach to heavy fermion systems

2004-06-11

arxiv.org/abs/cond-mat/0406264v2

Eur. Phys. J. B 42, 17-30 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1140/epjb/e2004-00354-y

We use Wegner's flow equation method to investigate the infinite-$U$ 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 $c$ and $f$ 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.

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