The exponent a for the nonlinear IV characteristics, V~Iᵃ, is obtained from a critical scaling argument for a two dimensional superconductor below Tc. The scaling assumption is supported by numerical simulations. The IV characteristics for the resistively shunted-juction model is simulated numerically, and excellent agreement with the predicted exponent is found. The new scaling exponent differs from the generally accepted Ambegaokar-Halperin-Nelson-Siggia result. The reason for this discrepancy is discussed.
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Minnhagen et al. (1995) studied this question.
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