Shot-noise suppression at two-dimensional hopping - art. no. 081302

We have used Monte Carlo simulation to calculate the shot-noise intensity S -1(omega) at (two-dimensional) hopping using two models: a slanted lattice of localized sites with equal energies and a set of localized sites with ra ndom positions and energies. For wide samples we have found a similar depen dence of the Fano factor F equivalent to S-1(0)/2eI on the sample length L: F proportional to L-alpha where alpha = 0.85+/-0.02 and alpha = 0.85+/-0.0 7 in uniform and random models, respectively. Moreover, at least for the un iform model, all the data for F as the function of sample length L and widt h W may be presented via a single function of the ratio W/L-beta, with beta = 2 alpha -1 approximate to 0.7. This relation has been interpreted using a simple scaling theory.