Acoustic lattice losses in ZnO and CdS measured with acoustoelectrically inactive domains

Siebert, Friedrich; Keller, Ole; Wettling, W.

doi:10.1002/pssa.2210040106

Cited by 18 publications

(1 citation statement)

References 12 publications

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“…. Lattice losses will in general not be independent of direction of sound propagation, but earlier measurements [8] show that these losses in ZnO and CdS are rather independent of direction. The only effect of the non-electronic losses is thus to give a cut-off in the angle of maximum gain a t a voltage close to the threshold voltage.…”

Section: Anisotropy Effects In Linear Theorymentioning

confidence: 90%

Off-axis acoustoelectric domains studied by Brillouin scattering

Keller

1971

Phys. Stat. Sol. (a)

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An investigation is made of Brillouin scattering of acoustoelectric domains in semiconducting ZnO and CdS, in the case where the crystal is oriented with the electric drift field parallel to the hexagonal axis. The domains consist of off-axis shear waves. Angular dispersion due to strong elastic anisotropy is studied, and it is shown that the angle of maximum gain depends on the applied voltage and is limited by the sample geometry. The development of the angular spectrum for several acoustic frequencies is determined. The frequency spectrum of the domain is dominated by frequencies well below the frequency of maximum linear gain. Es wird die Brillouinstreuung von akustoelektrischen Domanen in halbleitendem ZnOund CdS fur den Fall untersucht, da13 die elektrische Feldstarke parallel zur hexagonalen Achse orientiert ist. Die Domanen bestehen aus transversalen ,,off-axis"-Wellen. Die Winkelverteilung der Energie in den anisotropen Kristallen wird beziiglich der Verteilung der Schallgeschwindigkeit der laufenden Domanen untersucht und gezeigt, da13 der Winkel fur maximale akustoelektrische Verstirkung vom angelegten elektrischen Feld und vom Querschnitt des Kristalls abhangt. Die Winkelverteilung verschiedener akustischer Frequenzen wurde untersucht und gefunden, daB Frequenzen dominieren, die betrachtlich kleiner als die Frequenz maximaler linearer Verstarkung sind.

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Section: Anisotropy Effects In Linear Theorymentioning

confidence: 90%

Off-axis acoustoelectric domains studied by Brillouin scattering

Keller

1971

Phys. Stat. Sol. (a)

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Influence of elastic anisotropy on acoustoelectric domain propagation

Keller

1972

Phys. Stat. Sol. (a)

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The effect of elastic anisotropy on acoustoelectric domain propagation in semiconducting CdS has been studied by Brillouin scattering. Two configurations were examined. In the longitudinal configuration (E ∥ c) V‐shaped domains with the two branches containing different acoustic wave vector distributions were observed. As the domain propagates, the domain tilt angle (θD) changes and saturates at an angle corresponding to the angle of energy propagation (θE) for the off‐axis modes of maximum gain. Spatial splitting of the localized flux into two domains propagating near the surfaces has been observed. In the 45° configuration (angle between E and c 45°) angular focusing of energy is obtained experimentally, and phonon packets of quasi‐longitudinal modes have been discovered upon reflection of the domain from the anode.

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Acoustoelectric interaction in semiconductors

Kuzmany

1974

Phys. Stat. Sol. (a)

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Acoustic lattice losses in ZnO and CdS measured with acoustoelectrically inactive domains

Abstract: Acoustoelectric domains in ZnO and CdS can be converted into domains of non‐coupling sound waves by reflection. These acoustoelectrically inactive waves have been used to measure non‐electronic losses with the Brillouin scattering technique.

Cited by 18 publications

References 12 publications

Off-axis acoustoelectric domains studied by Brillouin scattering

Off-axis acoustoelectric domains studied by Brillouin scattering

Influence of elastic anisotropy on acoustoelectric domain propagation

Acoustoelectric interaction in semiconductors

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