ELECTRON-DENSITY CORRELATION-FUNCTION OF THE 2-DIMENSIONAL ELECTRON-GAS IN ALXGA1-XAS/GAAS HETEROJUNCTIONS

We have obtained an expression for the density correlation function of a two-dimensional electron gas (2D EG) confined in an AlxGa1-xAs/GaAs heterojunction, in which we assume the nonparabolicity of the band structure to be governed by a Kane-like dispersion relation. We have further demonstrated that the insertion of this correlation function in the momentum and energy balance equations derived by Lei and Ting for parabolic band structures can be justified on physical grounds, leading to an improved description of high-field transport in III-V compound heterojunctions. © 1990 The American Physical Society.