(Submitted on 22 Jun 2017)
We report on observation of pronounced terahertz radiation-induced magneto-resistivity oscillations in AlGaAs/GaAs two-dimensional electron systems, the THz analog of the microwave induced resistivity oscillations (MIRO). Applying high power radiation of a pulsed molecular laser we demonstrate that MIRO, so far observed at low power only, are not destroyed even at very high intensities. Experiments with radiation intensity ranging over five orders of magnitude from0.1 W/cm2 to104 W/cm2 reveal high-power saturation of the MIRO amplitude, which is well described by an empirical fit functionI/(1+I/Is)β withβ∼1 . The saturation intensity Is is of the order of tens of W/cm2 and increases by six times by increasing the radiation frequency from0.6 to1.1 THz. The results are discussed in terms of microscopic mechanisms of MIRO and compared to nonlinear effects observed earlier at significantly lower excitation frequencies.
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