INTERPARTICLE COLLISIONS AND HOT-ELECTRON VELOCITY FLUCTUATIONS IN GAAS AT 80 K

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.