T. Gonzalez et D. Pardo, ENSEMBLE MONTE-CARLO WITH POISSON SOLVER FOR THE STUDY OF CURRENT FLUCTUATIONS IN HOMOGENEOUS GAAS STRUCTURES, Journal of applied physics, 73(11), 1993, pp. 7453-7464
An analysis of current fluctuations in homogeneous N-type GaAs structu
res of different lengths and doping concentrations is presented. The s
tudy is performed coupling self-consistently a Poisson solver to a man
y-particle Monte Carlo simulation. The autocorrelation functions and t
he spectral density of current fluctuations are calculated, dividing t
hem into different contributions that allow one to analyze several sou
rces of noise. A qualitative analysis of shot noise is made. Different
behaviors of current fluctuations are found among the different struc
tures; these are interpreted in terms of the microscopic processes occ
urring inside them. For high values of impurity concentration (10(17)
CM-3), the coupling between fluctuations in the electric field and in
carrier velocity is found to be an important source of noise.