Comments on Two-Phonon Resonances in Quantum Crystals
- 15 May 1971
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 3 (10), 3556-3558
- https://doi.org/10.1103/physrevb.3.3556
Abstract
Recent numerical computations of the phonon spectrum of quantum crystals have demonstrated the existence of an anomalous extra phonon branch which lies above the usual acoustic modes. The purpose of the present note is to explain the physical origin of the anomalous branch in terms of two-phonon resonances, and to discuss briefly the possibility of observing these resonances in quantum crystals by neutron-scattering and Raman-scattering experiments.Keywords
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