Employing the random-phase-approximation density-density correlation function, we calculate the real and imaginary parts of the high-frequency electron conductivity due to remote and background impurity scatterings in a type-I superlattice, which is composed of an infinite number of periodically arranged quantum wells of finite width. The relaxation time and the effective-mass correction, calculated as functions of frequency, show strong resonance around the plasma frequency of the system.
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Lei et al. (1986) studied this question.
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