Phonon group velocity and thermal conduction in superlattices

Tamura, Shin-ichiro; Tanaka, Yukihiro; Maris, Humphrey J.

PHYSICAL REVIEW B, 1999, 60(4), 2627-2630

Permalink : https://hdl.handle.net/2115/5917

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アクセス権
open access
URI
https://hdl.handle.net/2115/5917
タイトル
Phonon group velocity and thermal conduction in superlattices
著者
Tamura, Shin-ichiro ; Tanaka, Yukihiro ; Maris, Humphrey J.
e-Rad_Researcher
80109488
著者名
Tamura, Shin-ichiro
田村, 信一朗
e-Rad_Researcher
00281791
著者名
Tanaka, Yukihiro
著者名
Maris, Humphrey J.
言語
英語
発行日
1999-07-15
出版者
American Physical Society
収録物名
PHYSICAL REVIEW B
巻(号)
60(4)
ページ
2627-2630
抄録
With the use of a face-centered cubic model of lattice dynamics we calculate the group velocity of acoustic phonons in the growth direction of periodic superlattices. Comparing with the case of bulk solids, this component of the phonon group velocity is reduced due to the flattening of the dispersion curves associated with Brillouin-zone folding. The results are used to estimate semiquantitatively the effects on the lattice thermal conductivity in Si/Ge and GaAs/AlAs superlattices. For a Si/Ge superlattice an order of magnitude reduction is predicted in the ratio of superlattice thermal conductivity to phonon relaxation time [consistent with the results of P. Hyldgaard and G. D. Mahan, Phys. Rev. B 56, 10 754 (1997)]. For a GaAs/AlAs superlattice the corresponding reduction is rather small, i.e., a factor of 2–3. These effects are larger for the superlattices with larger unit period, contrary to the recent measurements of thermal conductivity in superlattices.
資源タイプ
学術雑誌論文
出版タイプ
Version of Record
権利情報
Copyright © 1999 American Physical Society
PISSN
0163-1829
関連情報
URI
http://www.aps.org/
関連情報 (isIdenticalTo)
出版社版DOI
https://doi.org/10.1103/PhysRevB.60.2627