Quantum orbital entanglement: A view from the extended periodic Anderson model

Abstract

In an attempt to derive the electronic structure of narrow-band systems, we extend the periodic Anderson model by exploiting the Falicov--Kimball--Hubbard interactions. The dynamical mean-field theory is used to obtain the spectral densities and self-energies of the combined model. We show that correlated orbitals become locally entangled due to composite orbital rehybridization. This many-orbital quantum phenomenon is accompanied by a continuous metal-insulator transition away from half-filling. Our results are relevant for the understanding of the role of the multiorbital Kondo screening processes in generating local orbital entanglement in Kondo systems.