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 $E_g+(1+\frac{m_v}{m_c})$ ${\omega }_0$, ${\omega }_0$ being the optical-phonon energy.