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Coherent Thermal Conduction in Silicon Nanowires with Periodic Wings

1
Institute of Industrial Science, University of Tokyo, Tokyo 153-8505, Japan
2
PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(2), 142; https://doi.org/10.3390/nano9020142
Received: 1 January 2019 / Revised: 17 January 2019 / Accepted: 17 January 2019 / Published: 22 January 2019
(This article belongs to the Special Issue Advances in Nanophononics)
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Abstract

Artificial periodic nanostructures, known as phononic crystals, promise to control the thermal properties of nanostructures in the coherent regime, which can be achieved in semiconductors at low temperatures. Here, we study coherent thermal conduction in silicon nanowires with added periodic wings at sub-Kelvin temperature. Our simulations show that the added periodic wings flatten the phonon dispersion and thus reduce the thermal conductance. We investigate the dependence of this reduction on the size of the wings and conclude that the reduction is mainly caused by the periodicity of the wings, rather than by local resonances in them. These findings help to better understand the mechanisms controlling coherent heat conduction in periodic resonant nanostructures. View Full-Text
Keywords: phononic crystals; nanowires; thermal conductivity; silicon phononic crystals; nanowires; thermal conductivity; silicon
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Anufriev, R.; Nomura, M. Coherent Thermal Conduction in Silicon Nanowires with Periodic Wings. Nanomaterials 2019, 9, 142.

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