The density of energy states and number of states in the zones in the case of a spectrum symmetric relative to electrons and holes are computed in a two-zone model generalized by taking into account the influence of remote zones. Numerical estimates of the density of states in the case of energies at a distance from the zone edges of approximately the width of the forbidden zone are presented, and may markedly differ from the results of Cain model; the difference in the electron concentration is less substantial.
Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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