Figure 2
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Dependence of current on ζ. k 4/k 2 = 0.2 (red), 0.5 (blue), 1 (black) and 2 (green), k 1 = 102, k −1 = 10−1, k 2 = 10, k 3 = 102, k −3 = 10−1, k 4 = 10, e 0 = 10−5, l = 2 × 10−4, D 1 = 6.7 × 10−10 and D 2 = 8.8 × 10−10.