Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.594886
Title: A non linear theory of acoustoelectric amplification in piezoelectric semiconductors
Author: Ogg, Niel R.
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 1969
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Abstract:
At the present time there is a great deal of interest in non-linear acoustoelectric phenomena in piezoelectric semiconduotors. The behaviour of acoustic gain in the large signal regime is fundamental to an understanding of these phenomena. In this work we develop a non-linear theory of acoustoelectric gain. General expressions are derived for the dependence of acoustoelectric gain and current on the electron density distribution associated with an acoustic wave propagating through a piezoelectric semioonductor. The results are valid for nearly periodic travelling waves with arbitrary harmonic content. It is shown that the frequency of peak gain and the magnitude of the peak gain both tend to zero as the acoustic wave amplitude increases and the electrons bunch more strongly. These features agree qualitatively with experimental observations. A quantitative comparison of the predicted frequency shift at a given flux level agrees to within an order of magnitude with available experimental data. A theory for the dependence of acoustic gain on the electric potential accompanying the acoustic wave is also given. Numerical computations using the theory again produce a reduction in the aooustio gain and the frequency of peak acoustic gain. These results are also in reasonable agreement with experimental data.
Supervisor: Not available Sponsor: Ministry of Technology
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.594886  DOI: Not available
Keywords: QC Physics ; TK Electrical engineering. Electronics Nuclear engineering
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