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Ultrafast dynamics of coherent optical phonons in GeTe/Sb2Te3 superlattices: thermal conductivity and coherent control
http://hdl.handle.net/2241/00136345
http://hdl.handle.net/2241/00136345f8e9ea57-5ab8-4de4-985c-770d7a5e01c7
名前 / ファイル | ライセンス | アクション |
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Proc.SPIE_82601G (1.6 MB)
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Item type | Journal Article(1) | |||||
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公開日 | 2016-02-29 | |||||
タイトル | ||||||
タイトル | Ultrafast dynamics of coherent optical phonons in GeTe/Sb2Te3 superlattices: thermal conductivity and coherent control | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Hase, Muneaki
× Hase, Muneaki× Tominaga, Junji |
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著者別名 |
長谷, 宗明
× 長谷, 宗明 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We report on the evaluation of lattice thermal conductivity of GeTe/Sb2Te3 superlattice (SL) by using a coherent phonon spectroscopy at various lattice temperatures. The time-resolved transient reflectivity obtained in amorphous and crystalline GeTe/Sb2Te3 SL films exhibits the coherent A1 optical modes at terahertz (THz) frequencies with picoseconds dephasing time. The relaxation time and frequency of the coherent A1 modes are used to compute the lattice thermal conductivity based on the Debye theory, including scattering by grain boundary and point defect, umklapp process, and phonon resonant scattering. The results indicate that the thermal conductivity in the amorphous SL film is less temperature dependent, due to the dominant phonon-defect scattering, while in the crystalline SL it is temperature dependent because of the main contributions from umklapp and phonon resonant scatterings. We argue the higher thermal conductivity in the GeTe/Sb2Te3 SL films than that in the Ge2Sb2Te5 alloy films implies that the phase change in GeTe/Sb2Te3 SL is not purely promoted by thermal process, i.e., lattice heating, but rather by nonthermal process, i.e., coherent lattice excitation, because the thermal process generally requires lower thermal conductivity. | |||||
書誌情報 |
Proc. SPIE, Ultrafast Phenomena and Nanophotonics XVI 巻 8260, p. 82601G, 発行日 2012-02 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0277-786X | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10619755 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1117/12.908572 | |||||
権利 | ||||||
権利情報 | Copyright 2012 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. | |||||
著者版フラグ | ||||||
値 | author | |||||
出版者 | ||||||
出版者 | Society of Photo-optical Instrumentation Engineers |