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Article Dans Une Revue APL Materials Année : 2021

Thermal conductivity minimum of graded superlattices due to phonon localization

Yangyu Guo
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Zhongwei Zhang
Shiyun Xiong
Masahiro Nomura
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  • PersonId : 1138146

Résumé

Anderson localization of thermal phonons has been shown only in few nanostructures with strong random disorder by the exponential decay of transmission to zero and a thermal conductivity maximum when increasing the system length. In this work, we present a path to demonstrate the phonon localization with distinctive features in graded superlattices with short-range order and long-range disorder. A thermal conductivity minimum with system length appears due to the exponential decay of transmission to a non-zero constant, which is a feature of partial phonon localization caused by the moderate disorder. We provide clear evidence of localization through the combined analysis of the participation ratio, transmission, and real-space phonon number density distribution based on our quantum transport simulation. The present work would promote heat conduction engineering by localization via the wave nature of phonons.
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Dates et versions

hal-03406428 , version 1 (27-10-2021)

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Yangyu Guo, Marc Bescond, Zhongwei Zhang, Shiyun Xiong, Kazuhiko Hirakawa, et al.. Thermal conductivity minimum of graded superlattices due to phonon localization. APL Materials, 2021, 9 (9), pp.091104. ⟨10.1063/5.0054921⟩. ⟨hal-03406428⟩
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