RT - Journal Article T1 - The effects of high frequency electric field on the excitation of ultrasonic waves in a semiconductor quantum plasma JF - opsi YR - 2018 JO - opsi VO - 24 IS - 0 UR - http://opsi.ir/article-1-1477-en.html SP - 9 EP - 12 K1 - Piezoelectric Semiconductor K1 - Ultrasonic Waves K1 - Quantum Plasmas AB - In this research, an analytical investigation has been performed on the parametric excitation of an ultrasonic wave in a piezoelectric semiconductor plasma by the application of a high-frequency electric field. In the first place, estimating the quantum features of the medium, we investigate the effects of oscillating electric field on plasma. The results show that the high- frequency electric field, near the electron-plasma frequency, produces a nonlinear coupling between the ultrasonic waves and electron-plasma waves and leads to an instability which can be increased by quantum effects. LA eng UL http://opsi.ir/article-1-1477-en.html M3 ER -