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Current through the nanogap for an ac voltage (sinusoidal curve) of frequency (a) 0.01 Hz and (b) 10 Hz, having peak value of 80 V and 90 V, respectively. Inset in (a) shows the current (in units of 10−10 A) during t = 40–60 s.
Peak current Imax corresponding to the peak value of the applied ac voltage plotted against the frequency.
Theoretical fit of the experimental data of Fig. 2 at three different voltages of 20 V (lowermost set), 50 V, and 90 V (uppermost set) using Eq.(5).
Current Io and critical frequency fc as determined by fitting the data of Fig. 2 for different peak voltages Vmax with the expression of Eq. (5).
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