Enhancing of optic phonon contribution in hydrodynamic phonon transport

C. De Tomas; A. Cantarero; A. F. Lopeandia; F. X. Alvarez

doi:https://doi.org/10.1063/1.4932034

Enhancing of optic phonon contribution in hydrodynamic phonon transport

C. De Tomas, A. Cantarero, A. F. Lopeandia, F. X. Alvarez

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Abstract

© 2015 AIP Publishing LLC. In the framework of the kinetic-collective model of phonon heat transport, we analyze how each range of the phonon frequency spectrum contributes to the total thermal conductivity both in the macro and the nanoscale. For this purpose, we use two case study samples: naturally occurring bulk silicon and a 115nm of diameter silicon nanowire. We show that the contribution of high-energy phonons (optic branches) is non-negligible only when N-collisions are strongly present. This contribution increases when the effective size of the sample decreases, and it is found to be up to a 10% at room temperature for the 115nm nanowire, corroborating preliminar ab-initio predictions.

Original language	English
Article number	134305
Journal	Journal of Applied Physics
Volume	118
DOIs	https://doi.org/10.1063/1.4932034
Publication status	Published - 7 Oct 2015

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AU - Alvarez, F. X.

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AB - © 2015 AIP Publishing LLC. In the framework of the kinetic-collective model of phonon heat transport, we analyze how each range of the phonon frequency spectrum contributes to the total thermal conductivity both in the macro and the nanoscale. For this purpose, we use two case study samples: naturally occurring bulk silicon and a 115nm of diameter silicon nanowire. We show that the contribution of high-energy phonons (optic branches) is non-negligible only when N-collisions are strongly present. This contribution increases when the effective size of the sample decreases, and it is found to be up to a 10% at room temperature for the 115nm nanowire, corroborating preliminar ab-initio predictions.

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