Harmonic-Phonon Generation by Shear Waves inSi
- 2 July 1973
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 31 (1), 37-40
- https://doi.org/10.1103/physrevlett.31.37
Abstract
The generation of second-harmonic ultrasound (5 to 10 MHz) with an estimated conversion efficiency ≳ 20% has been observed for the soft shear mode in Si below 77°K. The harmonic generation is a manifestation of the unusually large shear anharmonicity for this unstable compound; however, static symmetry arguments forbid the generation of an even-ordered harmonic for a high-symmetry shear wave in a cubic crystal. Several possible sources of symmetry reduction are discussed.
Keywords
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