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Amplification of transverse acoustic phonons in quantum well heterostructures with piezoelectric interaction.
- Source :
-
Journal of Applied Physics . 10/15/2001, Vol. 90 Issue 8, p3934. 8p. 1 Diagram, 4 Graphs. - Publication Year :
- 2001
-
Abstract
- We have analyzed amplification of transverse phonons confined in quantum well (QW) heterostructures through piezoelectric electron–phonon interaction with drifting electrons. It was found that this mechanism of interaction couples the low-dimensional electrons and the shear-horizontal (SH) confined phonons. We have studied the electrostatic potential accompanying the SH waves and found that efficient interaction can be achieved for the lowest antisymmetric SH phonon branch in a narrow band of phonon frequencies. For AlGaAs QWs the amplification coefficient was calculated to be on the order of 100 cm[sup -1] in the sub-THz phonon frequency range. These results suggest an electrical method for coherent phonon generation in the technologically well-developed AlGaAs QW heterostructures. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHONONS
*HETEROSTRUCTURES
*QUANTUM wells
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 90
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 5252503
- Full Text :
- https://doi.org/10.1063/1.1402145