Hybridization in correlated bands with the Gutzwiller method- application to fluctuating valence.
01 January 1986
A model with two hybridized orbitals per site, one of which is correlated and the other is not, is considered. A variational wave function of the Gutzwiller form is used to calculate the mass enhancement. Unlike models with one orbital per site, there is no metal-insulator transition in the model because the occupation in the correlated orbital deviates from unity as the correlation energy increases. The binding energy and the effective mass as a function of the correlation energy and the hybridization energy is calculated. The relationship of the wavefunction used to wavefunctions explicitly showing the Kondo effect is discussed.