Scaling determination of the nonlinear I-V characteristics for 2D superconducting networks

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It is shown from computer simulations that the current-voltage (I-V) characteristics for the two-dimensional XY model with resistively-shunted Josephson junction dynamics and Monte Carlo dynamics obeys a finite-size scaling form from which the nonlinear I-V exponent a can be determined to good precision. This determination supports the conclusion a=z+1, where z is the dynamic critical exponent. The results are discussed in the light of the contrary conclusion reached by Tang and Chen [Phys. Rev. B 67, 024508 (2003)] and the possibility of a breakdown of scaling suggested by Bormann [Phys. Rev. Lett. 78, 4324 (1997)].