Abstract
Acoustic second-harmonic generation has been studied in n-type InSb with a dc magnetic field \\vecB directed along the acoustic waves propagating. We are interested in both high- and low-frequency regions, the electron relaxation time due to the scattering in solids is taken into account. The dominant electron-phonon interaction in solids is via deformation-potential coupling. It is shown that the ratio of the acoustic intensity in the second harmonic to the square of the acoustic intensity in the fundamental decreases rapidly and then increases slowly with the phonon frequency. A comparison between the deformation-potential coupling and piezoelectric coupling has been made. It is also found that the second-harmonic generation can be influenced by changing the dc magnetic field due to the nonlinear nature of energy bands in solids.
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