Quantum diffusion in one-dimensional disordered system with oscillatory perturbation

We report properties of quantum diffusion in one-dimensional disordered system with oscillatory perturbation. The velocity autocorrelation function is numerically computed, by comparing the result with that of stochastic noise and so on. It is, in particular, shown that the decay rate of the velocity autocorrelation function increases as the strength and/or number of the frequency component of the perturbation increases.