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Phonon group velocity and thermal conduction in superlattices

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Title: Phonon group velocity and thermal conduction in superlattices
Authors: Tamura, Shin-ichiro1 Browse this author →KAKEN DB
Tanaka, Yukihiro Browse this author →KAKEN DB
Maris, Humphrey J. Browse this author
Authors(alt): 田村, 信一朗1
Issue Date: 15-Jul-1999
Publisher: American Physical Society
Volume: 60
Issue: 4
Start Page: 2627
End Page: 2630
Publisher DOI: 10.1103/PhysRevB.60.2627
Abstract: 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.
Rights: Copyright © 1999 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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