V. A. Volkov, A. A. Zabolotnykh
In recent experimental studies of the microwave-irradiated ultraclean two-dimensional electron systems (2DESs) in magnetic field a puzzling colossal, narrow photoresistivity spike has been discovered in the vicinity of the 2nd cyclotron resonance harmonic. We suggest an explanation of this phenomenon in terms of the cyclotron parametric resonance in 2DES. We develop the hydrodynamic theory of 2D electron liquid in inhomogeneous microwave (MW) electric field. We demonstrate that excitation of virtual Bernstein magnetoplasma modes at the MW frequency near the double cyclotron frequency of 2D electrons can strongly enhance an effective microwave field. That is way the fundamental mode of the parametric resonance is excited at very low microwave power. The resulting instability leads to the heating of 2DES and the photoresistivity spike.
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http://arxiv.org/abs/1305.1238
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