We present theoretical investigations of the intrinsic dynamics of long-wavelength non-equilibrium optical phonons
in bulk and low-dimensional semiconductors. The theory is based on the application of Fermi's golden rule formula,
with phonon dispersion relations as well as crystal anharmonicity considered in the framework of isotropic
continuum model. Contributions to the decay rates of the phonon modes are discussed in terms of four possible
channels: Klemens channel (into two acoustic daughter modes), generalised Ridley channel (into one acoustic
and one optical mode), generalised Vallee-Bogani channel (into a lower mode of the same branch and an acoustic
mode), and Barman-Srivastava channel (into two lower-branch optical modes). The role of crystal structure
and cation/anion mass ratio in determining the lifetime of such modes in bulk semiconductors is highlighted.
Estimates of lifetimes of such modes in silicon nanowires and carbon nanotubes will also be presented. The
results support and explain available experimental data, and make predictions in some cases.
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