An oscillatory quasiperiodic structure is observed in the I-V characteristic of a Josephson point contact irradiated by a 525.5-GHz submillimeter laser signal and a 4.5-GHz microwave signal. Solving the resistively shunted Josephson (RSJ) model by a novel approach, in which the supercurrent is treated as a perturbation, the structure is shown to result from higher-order mixing processes.
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