Impurity-State-Optical-Phonon Coupling in a Magnetic Field in InSb

Abstract

A number of peaks in photoconductivity have been observed in $n$-type InSb when the impurity-shifted cyclotron resonance frequency is near the longitudinal optical phonon frequency. Certain of these peaks are interpreted as due to photon absorption resulting in the creation of an LO phonon and simultaneous excitation of the electronic impurity state. We present a theory based on the Fröhlich-type electron-phonon interaction.