UNIVERSALITY OF THE 1 3 SHOT-NOISE SUPPRESSION FACTOR IN NONDEGENERATE DIFFUSIVE CONDUCTORS/

Shot-noise suppression is investigated in nondegenerate diffusive cond uctors by means of an ensemble Monte Carlo simulator. The universal 1/ 3 suppression value is obtained when transport occurs under elastic co llision regime provided the following conditions are satisfied: (i) Th e applied voltage is much larger than the thermal value; (ii) the leng th of the device is much greater than both the elastic mean free path and the Debye length. By fully suppressing carrier-number fluctuations , long-range Coulomb interaction is essential to obtain the 1/3 value in the low-frequency limit.