Journal
NANO RESEARCH
Volume 15, Issue 10, Pages 9492-9497Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-4589-7
Keywords
GaAs/AlAs superlattices; thermal conductivity; coherent and incoherent phonon transport; continuum model
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Funding
- Tsinghua University Initiative Scientific Research Program
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This theoretical investigation explores coherent-to-incoherent heat conduction in multilayer nanostructures, demonstrating that in the coherent regime, accurate predictions can be made using the elastic continuum model. The study shows that as temperature or system size increases, phonon dephasing scattering results in deviation from coherent-limit calculation, and by introducing phonon incoherence, classical minimum thermal conductivity can be reproduced, extending the pure wave model into the wave-particle crossing regime.
We report a theoretical investigation of coherent-to-incoherent heat conduction in multilayer nanostructures. In the coherent regime where the phonon motion is quasi-harmonic, the elastic continuum model gives accurate cross-plane thermal conductivity predictions of upper limits and demonstrates that the coherent transport is the result of the interplay between intrinsic wave effects. As the temperature or system size increases, the phonon dephasing scattering results in the deviation of thermal conductivity from the coherent-limit calculation. By further introducing the incoherence of phonons, we reproduce the classical minimum thermal conductivity, indicating the feasibility of extending the pure wave model into the wave-particle crossing regime.
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