On the importance of optical phonons to thermal conductivity in nanostructures
Name
Chen_On the importance.pdf
Size
839.56 KB
Format
Adobe PDF
Checksum (MD5)
4f8a1968e7059ad7058308170fd51855
Author(s)
Tian, Zhiting
Esfarjani, Keivan
Shiomi, Junichiro
Henry, Asegun
Chen, Gang
Date Issued
August 2011
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Tian, Zhiting et al. “On the Importance of Optical Phonons to Thermal Conductivity in Nanostructures.” Applied Physics Letters 99.5 (2011): 053122. © 2011 American Institute of Physics
Version
Final published version
Abstract
The contribution of optical phonons to thermal conductivity has typically been ignored. However, when the system size decreases to the nanoscale regime, optical phonons are no longer negligible. In this study, the contributions of different phonon polarizations to the thermal conductivity of silicon are discussed based on the phonon lifetimes extracted from a first principles approach. The results indicate that around room temperature, optical phonons can contribute over 20% to the thermal conductivity of nanostructures as compared to 5% in bulk materials. In addition, the temperature and size dependence of the contributions from acoustic and optical phonons are fully explored.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/1.3615709
