DIMENSIONAL-CROSSOVER BEHAVIOR IN RANDOMLY LAYERED MEDIA

We study the lateral transport of two-dimensional randomly layered med ia in the presence of isotropic randomness. The hopping anisotropy is also included. Equilibration length and channel occupation number are calculated by using both the recursive Green's-function method and the rate-equation approach. Our results show clearly a transition from er godic to nonergodic transport as the number of layers increases. This describes a dimensional-crossover behavior from two-dimensional-like a nisotropic hopping systems to one-dimensional-like randomly layered me dia.