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Correlation Effects In Hopping Transport

M. Pollak, M. Knotek
Published 1979 · Chemistry

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Abstract The effects of intersite Coulomb interactions on transport in a system of localized states is examined. Correlation effects are seen to inhibit the DC conduction but to enhance the AC conduction. It is shown that the interactions lead to a Coulomb gap in the one-electron excitation spectrum for DC conduction of width E g ∝ E c (E c /W) 1 2 , where E c is the average intersite Coulomb energy and W is the random potential. The need to excite across the Coulomb gap can be alleviated by multi-electron hopping, which can lead to a non-activated T − 1 4 -like behavior as transport becomes collective in nature. Examples of systems where correlations effects have been observed are given. The possibility of a many-electron delocalization is also discussed.
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