Resonant-Polaron-Coupling Investigation by a Study of Linewidths, Strengths, and Frequencies of Cyclotron Resonance and Magnetic-Impurity Absorption in InSb

Abstract

Detailed examination of the electron-phonon (polaron) coupling of optical lattice modes to the magnetic states of both conduction and donor electrons in InSb has been made in the Faraday configuration, where no plasma interaction is present. The striking discontinuity observed in linewidth as the cyclotron-resonance frequency (${\ensuremath{\omega}}_{c}$) passes through the longitudinal-optic-mode frequency (${\ensuremath{\omega}}_{\mathrm{LO}}$) has been studied at temperatures of 15 and 88\ifmmode^\circ\else\textdegree\fi{}K for donor concentrations from 5\ifmmode\times\else\texttimes\fi{}${10}^{13}$ to 1\ifmmode\times\else\texttimes\fi{}${10}^{15}$ ${\mathrm{cm}}^{\ensuremath{-}3}$. The smaller effect of a simultaneous shift in the frequency of magnetic absorption is also observed in this configuration. Similar effects are found for both conduction and bound electrons, and both are explained on the basis of a one-phonon-interaction model developed by Harper.