MONTE-CARLO SIMULATION OF HOPPING CONDUCTION IN 2-DIMENSIONAL COULOMBGLASSES

We have carried out a Monte Carlo simulation of the conductivity of a two-dimensional strongly localized interacting system. A plot of d log sigma/d log T versus T, on a double logarithmic scale, clearly shows two distinct regimes, one activated at high T and a non-activated one at low T. The conductivity exponent in this later regime is close to 1 /2, in agreement with Efros and Shklovskii's predictions, although the characteristic temperature T0' is about a factor of two smaller than predicted.