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Anomalously long lifetimes of high-energy surface acoustic phonons
| Title: | Anomalously long lifetimes of high-energy surface acoustic phonons |
| Authors: | Tamura, Shin-ichiro1 Browse this author →KAKEN DB |
| Authors(alt): | 田村, 信一朗1 |
| Issue Date: | 15-Jul-1984 |
| Publisher: | American Physical Society |
| Journal Title: | Physical Review B |
| Volume: | 30 |
| Issue: | 2 |
| Start Page: | 610 |
| End Page: | 617 |
| Publisher DOI: | 10.1103/PhysRevB.30.610 |
| Abstract: | The lifetime of Rayleigh surface phonons as opposed to decay via anharmonic three-phonon processes is calculated in the regime ℏωR≫kBT. The surface phonon decays predominantly by combining with a bulk transverse phonon to create another bulk transverse phonon. The energymomentum conservation of the processes imposes the condition that those bulk phonons which may interact with the surface phonons should possess frequencies of the same order of ωR. However, such high-frequency phonons are rarely excited thermally under the condition considered here, leading to an anomalously long lifetime of the surface phonons in proportion to ωR-4.5T(-0.5)exp(A ℏωR/kBT), where A is a constant of the order of 0.1. We also estimate numerically the magnitude of the lifetime |
| Rights: | Copyright © 1984 American Physical Society |
| Relation: | http://www.aps.org/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/5953 |
| 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)
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Submitter: 田村 信一朗
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