A Monte Carlo Study of Diffusion Coefficients of Two-Dimensional Electron Gas in HEMT AlGaAs-GaAs Structures

This paper Presents a Monte Carlo study of diffusion and noise in two-dimensional electron gas (2DEG) in heterojunctions. This is mainly achieved via the calculation of velocity fluctuations correlation functions of the 2DEG subjected to a driving field applied along the channel. It is found that at rather low fields when the carriers have a real two-dimensional motion, the parallel correlation functions show oscillations which we analyse in terms of scattering rates. This gives rise to 2DEG resonant noise spectra whose resonance frequency is very nearly proportional to the driving field strength.