Fig. 3
From: Light-induced current in Cooper pair insulators in NbTiN films
Current-voltage characteristics in a double logarithmic scale at a temperature of 20 mK under illumination with light of a wavelength of 850 nm of different power levels for two different type of superinsulator. Symbols are shown current-voltage dependencies at temperatures near \(T_\textrm{BKT}\) without light. The solid straight lines show the calculated power dependences of current on voltage with different exponents. I(0) is current at zero-voltage. (a) Superinsulator with sharp threshold behavior. At a light power level of 1–4 \(\mu\)W, a change in the nature of the current-voltage characteristics at voltages below the threshold from a power to a linear one is observed. At a light power level of 128–256 \(\mu\)W, suppression of the threshold behavior is observed. (b) Superinsulator with soft threshold behavior. At a light power level of 0.5–1 \(\mu\)W, a change in the nature of the current-voltage characteristics at voltages below the threshold from a power to a linear one is observed.
