A. Matulionis et al., INTERPARTICLE COLLISIONS AND HOT-ELECTRON VELOCITY FLUCTUATIONS IN GAAS AT 80 K, Physical review. B, Condensed matter, 56(4), 1997, pp. 2052-2057
The microwave spectral density of longitudinal current fluctuations in
silicon-doped n-type GaAs at 80 K at moderate electric fields (<1 kV/
cm) is calculated. Electron collisions with phonons, impurities, and a
mong themselves are taken into account by a modified Monte Carlo proce
dure. The important role of interelectron collisions is disclosed, and
velocity-velocity cross correlation under nonequilibrium conditions i
s calculated. The quantitative fitting to the available experimental d
ata on the spectral density of current fluctuations is achieved, and t
he range of fields is defined for interparticle collisions to manifest
themselves in the noise.