Conductivity of the two-dimensional Coulomb glass

We studied by computer simulation the effects of Coulomb interactions on the properties of strongly localized Anderson insulators. We took full account of many-body effects by considering the many-electron configurations of the system rather than single-particle states. We developed an algorithm to obtain the configurations and energies of the low-lying system states, and from there the conductivity. At low-temperatures T, we found that the conductivity was proportional to exp(-${\mathrm{T}}_0$/T${)}^{1\mathrm{/}2}$. Many-electron transitions were seen to be important at very low temperatures. In this regime, ${\mathrm{T}}_0$≈0.61, which is much smaller than predicted by one-electron theory. Experimental results which use the predicted ${\mathrm{T}}_0$ to obtain localization radii must therefore be reinterpreted.