A balance equation for electron transitions is obtained, with allowance for corirelation of the electrons at the same center, in the framework of the Hubbard model. A procedure is indicated for the introduction of a small temperature gradient in the kinetic equation for hopping transport. It is shown that the conductivity problem amounts to finding the conductivity of two three-dimensional branched networks of random resistances. Under certain conditions these networks may be considered quasi - independent.
Semiconductor Physics Department
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