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Lattice dynamics and elastic phonon scattering in silicon
| Title: | Lattice dynamics and elastic phonon scattering in silicon |
| Authors: | Shields, J. A. Browse this author | | Tamura, S.1 Browse this author →KAKEN DB | | Wolfe, J. P. Browse this author |
| Authors(alt): | 田村, 信一朗1 |
| Issue Date: | 15-Aug-1991 |
| Publisher: | American Physical Society |
| Journal Title: | Physical Review B |
| Volume: | 44 |
| Issue: | 7 |
| Start Page: | 3001 |
| End Page: | 3011 |
| Publisher DOI: | 10.1103/PhysRevB.44.3001 |
| Abstract: | We have examined the propagation of acoustic phonons in silicon on the basis of two lattice-dynamics models: a bond-charge model and an effective-force-constant model consisting of only short-range forces. Phonon propagation is governed predominantly by phonon focusing due to elastic anisotropy and elastic scattering from isotopic atoms in the medium. Both of these effects depend on phonon dispersion. We find that the dispersive effects on the isotope scattering, i.e., the deviation of the scattering rate from a ν4 dependence, are discernible only at frequencies higher than 1.5 THz. However, the effects of dispersion on phonon focusing are observable at frequencies as low as ∼0.4 THz. In a slotted-crystal geometry, the calculated ratio of the scattered to the total phonon intensities yields very similar values for these two lattice-dynamics models and for elasticity theory, validating our previous results on the measurement of the elastic-scattering rate of phonons in silicon. |
| Rights: | Copyright © 1991 American Physical Society |
| Relation: | http://www.aps.org/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/5942 |
| 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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