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(Color online) Bias dependence of normalized tunneling conductance, calculated for , , and of 5%–20% of in steps of 2.5% (blue points), and single-thickness conductance for in steps (solid green lines).
(Color online) Gaussian weighting coefficients used to simulate roughness (thick line), and tunneling probability (dashed line) as functions of barrier thickness with and . The contribution of each thickness to is given by (thin solid line, normalized). The thickness inferred from conductance measurements is the mean of the thin curve, which differs from by .
(Color online) Best fit single thickness (a) and height (b) using the BDR model to fit vs in as a function of with for various (in percent of ).
(Color online) (a) parameter space from fitting with the full BDR model in a bias range of : white, blue, and orange filled contours represent , , and . The solid lines indicate 20% confidence intervals (CI). was calculated using , and . (b) Parameter space area for and decreases with increasing bias range used for fitting. 20% CI for (c) , and (d) as functions of the bias range used for fitting; CI fluctuations are due to using discrete and in the calculations.
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