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Time traces of the dark current noise and the corresponding amplitude distributions for different bias at 77 K. Note the significant differences in vertical scales of (a)–(c).
Dark current noise spectra at different biases.
Bias dependence of the cut-off frequency of PSD from Fig. 2. The dashed lines are fits to the exponential growth. Top inset: Different electric-field distributions in the QWIP corresponding to different resistivity states of the system: (a) Low resistivity up state and (b) high resistivity down state. Bottom inset: Dark current vs voltage plot.
Poisson distributions of up and down state residence times at . Insets: Standard deviations (SDs) of the current fluctuations around each level as a function of the voltage. Dashed lines are the best fits to the exponential law.
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