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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-shuntedJosephson junction dynamics and Monte Carlo dynamics obeys a finite-sizescaling form from which the nonlinear $I$-$V$ exponent $a$ can be determined togood precision. This determination supports the conclusion $a=z+1$, where $z$is the dynamic critical exponent. The results are discussed in the light of thecontrary conclusion reached by Tang and Chen [Phys. Rev. B {\bf 67}, 024508(2003)] and the possibility of a breakdown of scaling suggested by Bormann[Phys. Rev. Lett. {\bf 78}, 4324 (1997)].Comment: 6 pages, to appear in PR

physical review. b, condensed matter and materials physics

Scaling determination of the nonlinear<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>I</mml:mi><mml:mo>−</mml:mo><mml:mi>V</mml:mi></mml:math>characteristics for two-dimensional superconducting networks

Scaling determination of the nonlinearI−Vcharacteristics for two-dimensional superconducting networks