Monte Carlo calculation of the current-voltage characteristi(13)

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

equilibriumvoltage uctuationsintheabsenceofanynetcurrents.FordiscreteMonte

Carlotimeitisgivenby[16,23],inourunits,

R=1

(k)=1 2π