Low- and high-field analysis of longitudinal diffusivity of n-InSb

An attempt is made to study theoretically the low- and high-field longitudi nal diffusivity of n-InSb in the extreme quantum Limit. The investigations are made for two lattice temperatures 4.2 and 77 K, considering carrier scr eening and scattering mechanisms for various band structures. It is found t hat the diffusivity increases with electric field but decreases with magnet ic held. Moreover, the diffusivity decreases due to the inclusion of quantu m screening, band nonparabolocity and scatterings. It is also observed that the scattering mechanism plays an important role on the diffusivity. (C) 2 001 Elsevier Science Ltd. All rights reserved.