Abstract
The first topic treated is quantum transport. Two major lines of research have been investigated: the first is based on the introduction of the joint spectral density into a traditional Monte Carlo simulation; the second regards the formulation of a fully quantum mechanical approach for electron transport based on the density matrix approach. The second deals with treats noise, diffusion, and autocorrelation functions both from a theoretical and a simulative point of view. Results have been obtained for both bulk systems and quantum wells. The third topic concerns with an analysis of the effect of phonon populations in excess with respect to their thermal equilibrium values. Numerical Monte Carlo simulations have been performed for both GaAs and GaAs- A1GaAs quantum wells.