Modulation origin of 1/f noise in two-dimensional hopping - art. no. 201318

We show that 1/f noise in a two-dimensional electron gas with hopping condu ction can be explained by the modulation of conducting paths by fluctuating occupancy of nonconducting states. The noise is sensitive to the structure of the critical hopping network, which is varied by changing electron conc entration, sample size and temperature. With increasing temperature, it cle arly reveals the crossover between different hopping regimes.