Abstract
The magnetophonon resonance in the dc resistivity of a quasi-two-dimensional polar semiconductor irradiated by intense electromagnetic fields of terahertz frequency is investigated theoretically using a balance-equation approach. We find that the longitudinal resistivity as a function of the cyclotron frequency of the magnetic field exhibits, in addition to the conventional magnetophonon resonant peaks (zero-photon peak), many new peaks which correspond to one-, two-, and three-photon emission and absorption processes. With an increase of the strength of the terahertz field the zero-photon peaks descend, while the multiphoton $(|n|>1)$ peaks ascend. These multiphoton-magnetophonon resonant peaks should be observed experimentally in realistic, high-mobility systems when exposed to an intense terahertz irradiation.
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