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We investigate the effect of the Coulomb interaction, $U_{cf}$, between theconduction and f electrons in the periodic Anderson model using thedensity-matrix renormalization-group algorithm. We calculate the excitationspectrum of the half-filled symmetric model with an emphasis on the spin andcharge excitations. In the one-dimensional version of the model it is foundthat the spin gap is smaller than the charge gap below a certain value of$U_{cf}$ and the reversed inequality is valid for stronger $U_{cf}$. Thisbehavior is also verified by the behavior of the spin and density correlationfunctions. We also perform a quantum information analysis of the model anddetermine the entanglement map of the f and conduction electrons. It isrevealed that for a certain $U_{cf}$ the ground state is dominated by theconfiguration in which the conduction and f electrons are strongly entangled,and the ground state is almost a product state. For larger $U_{cf}$ the sitesare occupied alternatingly dominantly by two f electrons or by two conductionelectrons.

Interorbital interaction in the one-dimensional periodic Anderson model: A density-matrix renormalization-group study