Absorption in the Electron—Optical-Phonon System

Abstract

A determination of the optical absorption has been made for a semiconductor consisting of electrons in interaction with optical-mode phonons at zero temperature. The method used is a field-theoretical scheme which does not resort to a perturbation expansion. The absorption coefficient is markedly different from the free-carrier value for photon energies in the immediate neighborhood of ${E}_{g}+(1+\frac{{m}_{v}}{{m}_{c}})$ ${\ensuremath{\omega}}_{0}$, ${\ensuremath{\omega}}_{0}$ being the optical-phonon energy.