1. Enhancing of optic phonon contribution in hydrodynamic phonon transport.
- Author
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de Tomas, C., Cantarero, A., Lopeandia, A. F., and Alvarez, F. X.
- Subjects
PHONONS ,HEAT transfer ,THERMAL conductivity ,SILICON nanowires ,NANOSILICON - Abstract
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 115 nm 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 115 nm nanowire, corroborating preliminar ab-initio predictions. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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