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Material characteristics governing in-plane phonon-polariton thermal conductance.
- Source :
-
Journal of Applied Physics . 10/28/2023, Vol. 134 Issue 16, p1-7. 7p. - Publication Year :
- 2023
-
Abstract
- The material dependence of phonon-polariton-based in-plane thermal conductance is investigated by examining systems composed of air and several wurtzite and zinc-blende crystals. Phonon-polariton-based thermal conductance varies by over an order of magnitude (∼ 0.5 – 60 nW/K), which is similar to the variation observed in the materials corresponding to bulk thermal conductivity. Regardless of the material, phonon-polaritons exhibit similar thermal conductance to that of phonons when layers become ultrathin (∼ 10 nm), suggesting the generality of the effect at these length-scales. A figure of merit is proposed to explain the large variation of in-plane polariton thermal conductance that is composed entirely of easily predicted and measured optical phonon energies and lifetimes. Using this figure of merit, in-plane phonon-polariton thermal conductance enlarges with increases in (1) optical phonon energies, (2) splitting between transverse and longitudinal mode pairs, and (3) phonon lifetimes. [ABSTRACT FROM AUTHOR]
- Subjects :
- *POLARITONS
*PHONONS
*CRYSTALS
*WURTZITE
*PHONON scattering
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 134
- Issue :
- 16
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 173336235
- Full Text :
- https://doi.org/10.1063/5.0173917