J. Ruiz et al., MONTE-CARLO SIMULATION OF HOPPING CONDUCTION IN 2-DIMENSIONAL COULOMBGLASSES, Journal of physics. Condensed matter, 7(3), 1995, pp. 639-644
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.