Effect of Density Gradient on the Acousto-Electric Wave Instability in Ion-Implanted Semiconductor Plasmas

S. Ghosh and P. Khare School of Studies in Physics, Vikram University, Ujjain 456010, India

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Received: 17 08 2005;

Using hydrodynamic model of inhomogeneous plasma, an analytical investigation of excitation of acousto-electric mode was made in n-type piezoelectric ion-implanted semiconductor plasma. By employing the multi-fluid balance equations along with the elastic and Maxwell equations, a compact dispersion relation for the cases in which colloidal grains are either stationary (ϑ0d=0) or streaming (ϑ0d≠) is derived. We find that the choice of homogeneous medium is favorable in achieving higher acoustic gain per radian and the results of the investigation should be useful in understanding the characteristics of longitudinal acousto-electric wave in ion-implanted piezoelectric semiconductor whose main constituents are electrons and negatively charged colloidal particles.

DOI: 10.12693/APhysPolA.109.187 PACS numbers: 61.72.Vv, 72.30.+q, 82.70.Dd