Shot noise as a probe of electron transport via localised states in sub‐micrometer barriers

We show that shot noise is a useful tool in studies of electron transport in hopping and resonant tunnelling between localised states. In resonant tunnelling through a single impurity we observe an enhancement of shot noise caused by Coulomb interaction between two resonant channels. In hopping along chains of localised states, shot noise is shown to be sensitive to the distribution of the barriers between the states and the Coulomb interaction between hopping electrons. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)