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Efficient generation of coherent acoustic phonons in (111) multiple quantum wells through piezoelectric effects
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Extracted transmission (solid line) and reflection (dashed line) changes induced by CAPs as a function of time delay measured with a photon energy of and a photocarrier density of . The complete transmission trace is shown in the inset. The number of the observed CAP oscillations is the same as that of the MQW period.

Image of FIG. 2.
FIG. 2.

(Color online) Top: Calculated LA phonon dispersion curve. Bottom: Fourier power spectra of the measured transmission (solid line) and reflection (dashed line) data shown in Fig. 1. Thin solid lines indicate the frequencies with a corresponding phonon wave vector satisfying momentum conservation in the backward-Raman-scattering geometry . The periodic length of MQWs is .

Image of FIG. 3.
FIG. 3.

Relative CAP oscillation amplitude obtained from transient transmission measurement vs 2D photocarrier density in the MQWs (open circles). The fitting curve guided by eye is represented by the solid line. The dashed straight line is a fitting curve for the data with carrier density lower than .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Efficient generation of coherent acoustic phonons in (111) InGaAs∕GaAs multiple quantum wells through piezoelectric effects