Monte Carlo simulation of anomalous transit-time dispersion of amorphous solids

Simple Monte Carlo multiple-trapping model simulations of the observed anomalous transit-time dispersion have been made. The model employs multiple trapping from an exponential distribution. Our results simulate the features of the experimental observations as well as provide a rational explanation for the transition from nondispersive to dispersive transients as a function of temperature. Comparisons with recent results in $a-\mathrm{Se}$ show excellent agreement.