Model spectral density for hot-electron quantum transport

Abstract

Quantum transport theory indicates that a proper treatment of high-field transport in semiconductors should include collisional broadening and intracollisional field effects. By using the Generalized Kadanoff-Baym method, we construct a computational scheme which includes both of these effects. The central quantity in our theory is the joint spectral density K(k, k') which describes the relation between the initial and final kinetic momenta in a scattering event. Analytical and numerical analyses for several models of interest are presented and discussed.