Hopping Conductivity in Disordered Systems
- 15 October 1971
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 4 (8), 2612-2620
- https://doi.org/10.1103/physrevb.4.2612
Abstract
By considering a model in which charge is transported via phonon-induced tunneling of electrons between localized states which are randomly distributed in energy and position, Mott has obtained an electrical conductivity of the form . Here is the temperature of the system, is the density of states at the Fermi level, is a dimensionless constant, and is the distance for exponential decay of the wave functions. We rederive these results, relating to the critical density of a certain dimensionless percolation problem, and we estimate to be approximately 16. The applicability of the model to experimental observations on amorphous Ge, Si, and C is discussed.
Keywords
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