Thermal conductivity prediction of nanoscale phononic crystal slabs using a hybrid lattice dynamics-continuum mechanics technique
Recent work has demonstrated that nanostructuring of a semiconductor material to form a phononic crystal (PnC) can significantly reduce its thermal conductivity. In this paper, we present a classical method that combines atomic-level information with the application of Bloch theory at the continuum...
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Published in | AIP advances Vol. 1; no. 4; pp. 041403 - 041403-14 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
American Institute of Physics
01.12.2011
AIP Publishing LLC |
Online Access | Get full text |
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Summary: | Recent work has demonstrated that nanostructuring of a semiconductor material to form a phononic crystal (PnC) can significantly reduce its thermal conductivity. In this paper, we present a classical method that combines atomic-level information with the application of Bloch theory at the continuum level for the prediction of the thermal conductivity of finite-thickness PnCs with unit cells sized in the micron scale. Lattice dynamics calculations are done at the bulk material level, and the plane-wave expansion method is implemented at the macrosale PnC unit cell level. The combination of the lattice dynamics-based and continuum mechanics-based dispersion information is then used in the Callaway-Holland model to calculate the thermal transport properties of the PnC. We demonstrate that this hybrid approach provides both accurate and efficient predictions of the thermal conductivity. |
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Bibliography: | AC04-94AL85000 USDOE National Nuclear Security Administration (NNSA) |
ISSN: | 2158-3226 2158-3226 |
DOI: | 10.1063/1.3675918 |