Skip to Main content Skip to Navigation
Journal articles

Tunable Superlattice In-plane Thermal Conductivity based on Asperity Sharpness at Interfaces: Beyond Ziman’s Model of Specularity

Abstract : We prove that interfacial asperity sharpness allows for tuning superlattice in-plane thermal conductivity below or above the limit of high roughness derived from the Lucas-Ziman (LZ) model. Whereas LZ’s model predicts molecular dynamic (MD) results of Lennard-Jones superlattices for small asperities, it has to be modified with a roughness- and sharpness-dependent layer thickness to remain relevant at higher roughness. For the case of sharpest asperities, the modified LZ model still fails, and ray-tracing computations matching MD data reveal a phonon-trap effect in the asperity valleys. This behavior scales with the Knudsen number and should appear at the micron scale in large mean-free-path crystals, such as silicon.
Complete list of metadatas

https://hal-centralesupelec.archives-ouvertes.fr/hal-01285833
Contributor : Sebastian Volz <>
Submitted on : Wednesday, March 9, 2016 - 6:22:44 PM
Last modification on : Friday, July 3, 2020 - 9:28:03 AM

Identifiers

Citation

Ali Rajabpour, Yann Chalopin, M. Vaez Allaei, Farshad Kowsary, Sebastian Volz. Tunable Superlattice In-plane Thermal Conductivity based on Asperity Sharpness at Interfaces: Beyond Ziman’s Model of Specularity. Journal of Applied Physics, American Institute of Physics, 2011, 110 (11), pp.113529. ⟨10.1063/1.3665408⟩. ⟨hal-01285833⟩

Share

Metrics

Record views

173