Intraband magnetoabsorption in mixed semiconductors with composition fluctuations and in imperfect semiconductors

Theory of the intraband magnetoabsorption is derived in the quantum limit for imperfect semiconductors and mixed semiconductors with composition fluctuations. Both band edge and effective mass are regarded as position dependent. All harmonics of cyclotron resonance appear in Faraday configuration (for both cyclotron-resonance-active and -inactive polarizations). The effective-mass fluctuations give "steps" at the harmonics of cyclotron resonance on the magnetoabsorption curve for $\overrightarrow{\mathrm{E}}\parallel \overrightarrow{\mathrm{H}}$.