Numerical evidence for the bottleneck frequency of quasidiffusive acoustic phonons

Article

关键词: MONTE-CARLO CALCULATIONS;    ISOTOPE SCATTERING;    SPONTANEOUS DECAY;    ANHARMONIC DECAY;    DARK-MATTER;    PROPAGATION;    SILICON;    SI;    DIFFUSION;    NUCLEAR;   

DOI  :  10.1103/PhysRevB.56.13630

来源: SCIE

【 摘 要 】

A kinetic equation on quasidiffusion of phonons was recently analyzed by Esipov and he predicted the existence of a bottleneck frequency (nu(BN)) which separates the phonons decaying from those diffusing to a detector. We have solved numerically the kinetic equation and obtained the temporal evolution of phonon concentration excited at the center of a spherical sample. We have also performed Monte Carlo simulations of phonon propagation in the same geometry. At a time much later than the ballistic arrival time of phonons, both sets of results exhibit a sharp peak in the phonon concentration around the predicted nu(BN) With Monte Carlo simulations we have also confirmed the same relaxation rate for the phonons of frequencies nu>nu(BN).

【 授权许可】

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