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The polarization dependence of photoconductivity response atcyclotron-resonance harmonics in a nondegenerate two-dimensional (2D) electronsystem formed on the surface of liquid helium is studied using a setup in whicha circular polarization of opposite directions can be produced. Contrary to theresults of similar investigations reported for semiconductor 2D electronsystems, for electrons on liquid helium, a strong dependence of the amplitudeof magnetoconductivity oscillations on the direction of circular polarizationis observed. This observation is in accordance with theoretical models based onphoton-assisted scattering and, therefore, it solves a critical issue in thedispute over the origin of microwave-induced conductivity oscillations.

Circular-Polarization-Dependent Study of Microwave-Induced Conductivity Oscillations in a Two-Dimensional Electron Gas on Liquid Helium