Abstract
The energy focusing patterns of acoustic phonons in hexagonal CdSe, ZnS, and ZnO crystals at room temperature are calculated with allowance for the piezoelectric coupling. Estimates are presented, and it is shown that the piezoelectric stiffening and the values of the elastic and dielectric constants of the crystals, which characterize the processes by which the samples were grown, have a nonmonotonic influence on the focusing. Piezoelectric splitting of the phonon fluxes is observed, and it is found that the slow transverse acoustic (STA) modes are infinitely concentrated. The possibility of modifying the focusing anisotropy of STA phonons in hexagonal II-VI compounds by doping them with lithium is predicted. Experiments on acoustoelectronic generation in CdSe are analyzed, and it is concluded that the variety of highfrequency current oscillation spectra can be controlled by an isolated part of the focusing patterns of different modes.
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