Abstract
We study dymanical properties of the symmetric periodic Anderson model in infinite dimensions by applying the quantum Monte Carlo method and the maximum entropy method. It is found that at low temperatures a gap is developed in the density of states, in the local spin excitation spectrum and in the local charge excitation spectrum. We clarify the effects of the strong electron correlation on structure of these dynamical quantities. As the strength of interaction increases, a sharp peak evolves at a low frequency region in the spin excitation spectrum while a broad shoulder appears at a higher frequency. On the other hand, as the interaction gets strong, the charge excitation spectrum splits into a low-frequency part and a high-frequency part; the low frequency part is severely suppressed by the interaction. The reliability and the limitation of the maximum entropy method are also discussed in detail.
