Monte Carlo calculation of the current-voltage characteristi(20)

We have studied the nonlinear current-voltage characteristic of a two dimensional lattice Coulomb gas by Monte Carlo simulation. We present three different determinations of the power-law exponent $a(T)$ of the nonlinear current-voltage characteristic, $V

WeacknowledgestimulatingdiscussionswithP.MinnhagenandK.Holmlund.H.W.was

supportedbygrantsfromCarlTrygger,M.W.wassupportedbygrantsfromtheSwedish

NaturalScienceResearchCouncil(NFR)andH.J.J.wassupportedbytheBritishEPSRC.