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Microscopic Description of Thermal Phonon Coherence : From Coherent Transport to Diffuse Interface Scattering in Superlattices

Abstract : We demonstrate the existence of a coherent transport of thermal energy in superlattices by introducing a microscopic definition of the phonon coherence length. A criterion is provided to distinguish the coherent transport regime from diffuse interface scattering and discuss how these can be specifically controlled by several physical parameters. Our approach provides a convenient framework for the interpretation of previous thermal conductivity measurements and calculations; it also paves the way for the design of a new class of thermal interface materials.
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Submitted on : Wednesday, March 9, 2016 - 7:05:21 PM
Last modification on : Friday, July 3, 2020 - 9:28:03 AM

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Benoit Latour, Sebastian Volz, Yann Chalopin. Microscopic Description of Thermal Phonon Coherence : From Coherent Transport to Diffuse Interface Scattering in Superlattices. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2014, 90 (1), ⟨10.1103/physrevb.90.014307⟩. ⟨hal-01285868⟩

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