Thermodynamics of the Falicov-Kimball model with two spinless impurities interacting with a fermionic bath -: art. no. 085104

Specific heat and charge susceptibility are computed for the Falicov-Kimball model with two spinless impurities embedded in a fermionic bath. The model takes into account the Coulomb scattering and hybridization between local levels and conduction states. The numerical renormalization group with two discretization parameters is used to obtain the spectrum of the model, from which the thermodynamic is obtained. We discuss the importance of going beyond the usual approximation that projects all momenta at the Fermi level.