Gutzwiller method for heavy electrons

Abstract

The Kondo limit of the periodic Anderson model is studied with use of the Gutzwiller method. Because of the nonanalytic form of the energy gain due to hybridization, a small number of electrons are promoted out of the f-level giving rise to an almost-localized Fermi-liquid state of the f electrons. Both symmetric and asymmetric limits of the Anderson model are discussed and in the former case the difference between the lattice and single-site problems is examined. A comparison is made to other examples of almost-localized Fermi liquids which are based on the Hubbard model. Finally the consequences of disorder in the Anderson model are examined.