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We present a microscopic theory on the observation of a beating pattern inthe radiation-induced magnetoresistance oscillations at very low magneticfield. We con- sider that such a beating pattern develops as a result of thecoupling between two oscillatory components: the first is a system of electronLandau states being harmon- ically driven by radiation. The second is a latticeoscillation, i.e., an acoustic phonon mode. We analyze the dependence of thebeating pattern on temperature, radiation frequency and power. We conclude thatthe beating pattern is an evidence of the radiation-driven nature of theirradiated Landau states that makes them behave as a collective plasmaoscillation at the radiation frequency. Thus, the frequency of such plasmonscould be tuned from microwave to terahertz in the same nanodevice with anapparent technological application.

Beating pattern in radiation-induced oscillatory magnetoresistance in 2DES: coupling of plasmon-like and acoustic phonon modes