ACOUSTIC PROPERTIES OF SEMICONDUCTOR SUPERLATTICES AND INTERFACES

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Abstract
In this talk a brief review of recent work on acoustic properties of semiconductor superlattices and interfaces will be presented. Experiments on the effects of zone folding in the acoustic phonon dispersion curve of GaAs/AlGaAs superlattices will be described. These experiments use superconducting tunnel junctions as sources and detectors of quasimonochromatic phonons. Resonant absorption determined by the superlattice period will be demonstrated. These experiments prove the ideality of the GaAs/ AlGaAs interface for acoustic experirnents. In addition, the acoustic interaction with the 2-D electron gas (2 DEG) at the GaAs/AlGaAs heterojunction as a function of electric field will be described. Phonon emission due to "hot" electron effects at low temperatures is observed directly and is used to determine the relevant piezoelectric and deformation potential scattering processes and the onset of L0 phonon emission

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