Figure 7
From: Spatial and temporal distribution of phase slips in Josephson junction chains
(a) Power Spectral Density (PSD) of the voltage signal created by the PSC as a function of bias voltage and frequency. The black diagonal arrow indicates the frequency of the Josephson oscillations as a function of bias voltage, f = 2eV bias/h. (b) Simulated dc-IV curve with the three bias points (magenta, black and green) representing the dashed lines in (figure a). (c) PSD profile for the bias voltage \(V=0.7\,[2{{\rm{\Delta }}}_{0}/e]\). Frequency of the Josephson oscillations at this voltage bias is similar to the plasma frequency of the PSC, f p ~ 149 GHz. (d) PSD profile for the bias voltage \(V=0.85\,[2{{\rm{\Delta }}}_{0}/e]\). Low frequency behavior of the PSD shows discrete plasmon modes and the accumulation of the frequency peaks up to the plasma frequency. The Josephson oscillation peak corresponding to the applied voltage is also visible and marked with an arrow. (e) PSD profile for a bias voltage above the superconducting gap, \(V=1.02\,[2{{\rm{\Delta }}}_{0}/e]\).
