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Numerical evidence for the bottleneck frequency of quasidiffusive acoustic phonons

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タイトル: Numerical evidence for the bottleneck frequency of quasidiffusive acoustic phonons
著者: Tamura, Shin-ichiro 著作を一覧する
発行日: 1997年
出版者: American Physical Society
誌名: PHYSICAL REVIEW B
巻: 56
号: 21
開始ページ: 13630
終了ページ: 13633
出版社 DOI: 10.1103/PhysRevB.56.13630
抄録: 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
Relation (URI): http://www.aps.org/
資料タイプ: article
URI: http://hdl.handle.net/2115/5918
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 田村 信一朗

 

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