The effects of microwave radiation on the transport properties of atomically thin ${\text{La}}_{2-x}{\text{Sr}}_x{\text{CuO}}_4$ films were studied in the 0.1–13 GHz frequency range. Resistance changes induced by microwaves were investigated at different temperatures near the superconducting transition. The nonlinear response decreases by several orders of magnitude within a few GHz of a cutoff frequency ${\nu }_{\text{cut}}\approx 2\text{GHz}$. Numerical simulations that assume an ac response to follow the dc $V-I$ characteristics of the films reproduce well the low-frequency behavior, but fail above ${\nu }_{\text{cut}}$. The results indicate that two-dimensional (2D) superconductivity is resilient against high-frequency microwave radiation, because vortex-antivortex dissociation is dramatically suppressed in 2D superconducting condensates oscillating at high frequencies.

• Received 28 April 2014
• Revised 27 August 2014

DOI:https://doi.org/10.1103/PhysRevB.91.060506