Monte-Carlo Calculated Nonequilibrium Phonon Pulses in GaAs
Time-of-flight spectra for nonequilibrium phonons in GaAs crystals are obtained by Monte-Carlo simulation procedure. The calculations use the quasi-isotropic Tamura model for anharmonic phonon decay and the Rayleigh w-4 law for isotope scattering. The obtained spectra demonstrate a transition from the ballistic regime to quasidiffusive propagation regime via quasiballistic one as the anharmonic lifetime of phonons is changed. In spite of the intermode conversion time being short, the pulse shapes are different for the starting phonon of LA and TA mode.
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