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Numerical evidence for the bottleneck frequency of quasidiffusive acoustic phonons

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Title: Numerical evidence for the bottleneck frequency of quasidiffusive acoustic phonons
Authors: Tamura, Shin-ichiro1 Browse this author →KAKEN DB
Authors(alt): 田村, 信一朗1
Issue Date: 1997
Publisher: American Physical Society
Volume: 56
Issue: 21
Start Page: 13630
End Page: 13633
Publisher DOI: 10.1103/PhysRevB.56.13630
Abstract: A kinetic equation on quasidiffusion of phonons was recently analyzed by Esipov and he predicted the existence of a bottleneck frequency (νBN) 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 νBN. With Monte Carlo simulations we have also confirmed the same relaxation rate for the phonons of frequencies ν<νBN.
Rights: Copyright © 1997 American Physical Society
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 田村 信一朗

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