• Kinetic theory of parametric excitation of acoustic waves in piezoelectric semiconductors

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      https://www.ias.ac.in/article/fulltext/pram/002/06/0304-0311

    • Keywords

       

      Piezoelectric semiconductors; parametric effects; acoustic waves

    • Abstract

       

      Using a kinetic description for electrons and the usual equation of motion for lattice displacement we have derived a general dispersion relation for acoustic waves in a piezoelectric semiconductor, in the presence of a strong high frequency electric field oscillating near the electron plasma frequency. Earlier hydrodynamic results valid fore≪1 (wherek is the wave number of the acoustic wave andλethe electron mean free path) are rederived as a special case. Fore≫1, two instability branches are discovered and magnitudes of the threshold electric field required to drive the acoustic wave unstable in each case, are obtained.

    • Author Affiliations

       

      A K Sundaram1 P K Kaw1 S K Sharma2

      1. Physical Research Laboratory, Ahmedabad - 380009
      2. Electrophysics Group, Physics Department, Indian Institute of Technology, New Delhi - 110029
    • Dates

       
  • Pramana – Journal of Physics | News

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