The effects of microwave radiation on transport properties of atomically thin superconducting La2xSrxCuO4 films were studied in the 0.1 -13 GHz frequency range in the BKT state above Tc. The microwave nonlinear response is found to decrease by several orders of magnitude within a few GHz of the cutoff frequency f≈2 GHz. The results indicate that two-dimensional superconductivity is resilient against the high-frequency radiation, which is related to strong suppression of the dissociation of the vortex-antivortex pairs in 2D superconducting condensates oscillating at high frequencies.
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