Abstract
Using the velocity operator derived from the Heisenberg equation of motion, we have investigated second-harmonic generation of acoustic waves propagating in nondegenerate piezoelectric semiconductors with a uniform dc magnetic field B directed along the waves. Since we are interested in both high-and low-frequency regions, an electron relaxation time due to the scatterings in solids is taken into account. Results show that the second-harmonic generation due to the piezoelectric polarization is insignificant in the very low-frequency region. However, when the frequency is coming into the microwave region, the second-harmonic generation increases quite rapidly with the sound frequency up to some maximum points at the range of frequency ω=1011–2×1011 rad/s, and then decreases. There are two maximum points in this range of frequency at very low temperatures. When the temperature increases, these two maximum points will be reduced to only a single maximum point. It is also found that the second-harmonic generation can be influenced by the dc magnetic field due to the nonlinear nature of energy bands in piezoelectric semiconductors.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
