Variation of electron transport properties near NDC region and the effects of anisotropic scattering

Electron transport properties near negative differential conductivity (NDC) region cue investigated using Monte-Carlo simulation, The excitation collisions that frequently occur within a narrow range of reduced electric field give a remarkable enhancement of the drift velocity, and the NDC is observed in the higher field range with the decrease of the drift velocity Lack to normal, NDC is merely a side effect of the drift velocity enhancement but cannot be seen in itself. The effects of elastic and inelastic anisotropic scatterings on the electron transport properties are also examined.