Abstract
The possible formation of a bound state of two phonons by repulsive anharmonic coupling has been previously discussed in terms of a simple model Hamiltonian. These theoretical efforts yield a reasonable estimate for the bound-state energy, and provide a physical interpretation for the observed anomalous peak in the two-phonon Raman spectrum of diamond. In the present paper we consider the Raman intensity attributed to scattering from two-phonon bound states. The present theory is based on a two-phonon deformation-potential approach. The calculated intensity for diamond is in good agreement with available experimental data and thus provides further evidence for the existence of bound phonon pairs.
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