Influence of Plasmon-Phonon Coupling on the Electron-Impurity Interaction in the Free-Carrier Absorption
W. Szuszkiewicz
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland

W. Bardyszewski
Institute of Theoretical Physics, Warsaw University, Hoża 69, 00-681 Warszawa, Poland

and C. Julien
Laboratoire de Physique des Solides de l'Université Pierre et Marie Curie (URA 154), 4, Pl. Jussieu, 75252 Paris Cedex 05, France
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An experimental and theoretical evidence that the electron-impurity scattering is modified in the presence of the electromagnetic field oscillating with the frequency corresponding to the optical phonon energy is given. The coupled plasmon-phonon mode related feature in the reflectivity spectrum can be used to determine the upper edge of the LO phonon frequency band in highly doped materials.
DOI: 10.12693/APhysPolA.87.555
PACS numbers: 71.45.Gm, 78.30.Fs, 72.30.+q