Longitudinal Phonon-Plasmon Interactions in Semiconducting Plasmas

The longitudinal phonon—plasmon interactions in semiconducting plasmas having piezoelectrixc or deformation potential coupling or both (viz. n-InSb) is investigated when the electrons drift in the direction ofthe acoustic wave propagation, in presence of an magnetic field of arbitrary orientation. Using the hydrodynamic approach, the dispersion relation D(Ω, k) is derived. The conditions for excitation and the gain per radian of the acoustic wave in the collision dominated regime are studied in detail in the quasi-static approximation. The analysis takes into account hot carrier effects and the temperature dependence of the momentum collision frequency. The variation of the gain per radian wih the system parameters is investigated. It is shown that the heating of the carrier decreases the gain.