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Current-voltage characteristics of a NbN nanowire (a) in the absence of an rf bias and (b) when driven at . The nanowire is a meander wide, thick, and long and is cooled to . Experimental points are shown as bold dots, and simulations as narrow solid lines in stable regions and dotted lines in unstable regions. In (b) the simulated rf amplitude is .
Model of a superconducting nanowire including a hotspot. The model parameters are , , , , and .
Current amplitude of rf-induced steps of order , 1, and 2 as a function of rf amplitude. Bold dots show experimental results and lines show simulations for the model parameters given in Fig. 2. The dashed vertical line corresponds to the rf amplitude of Figs. 1(b) and 4.
Voltage waveforms of the rf-biased nanowire on the , 1 and 2 steps plotted over one drive period, . Simulations, shown by narrow lines, are for the three bias points indicated by open circles in Fig. 1(b) with , 3.4, and and . The average voltage and the Fourier component at the drive frequency were removed from each curve. The experimental curves were shifted in time and scaled by a common factor to fit the theory curves.
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