DYNAMICAL CURRENT REDISTRIBUTION AND NON-GAUSSIAN 1 F NOISE/

Dynamical current redistribution (DCR) in noisy resistors is discussed . Contrary to a common assumption in many theories and in the interpre tation of many experiments. DCR can cause large-amplitude non-Gaussian (NG) noise for statistically independent fluctuators. NG effects are predicted to be large near the percolation threshold and near the meta l-insulator transition. We report the first observations of NG noise i n semiconductor superlattices and attribute this to DCR. We also show that DCR is the most likely explanation of NG noise in several other s ystems.