Anharmonic Decay of High-Energy LA Phonons
We discuss the effects of lattice dispersion upon the anharmonic decay of high-energy LA phonons in Ge. At frequencies higher than 2 THz the density of two-phonon final states increases more rapidly than v 2, suggesting that the spontaneous decay rate of the LA phonons depends on the frequency more strongly than v 5. The spatial anisotropy of the decay time is also remarked.
KeywordsSpatial Anisotropy Lattice Dispersion Spontaneous Decay Rate Continuum Elasticity Theory Isotopic Disorder
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