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Title: On the importance of optical phonons to thermal conductivity in nanostructures

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. 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.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Mechanical Engineering
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1386828
Grant/Contract Number:  
SC0001299; FG02-09ER46577
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 99; Journal Issue: 5; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English

Citation Formats

Tian, Zhiting, Esfarjani, Keivan, Shiomi, Junichiro, Henry, Asegun S., and Chen, Gang. On the importance of optical phonons to thermal conductivity in nanostructures. United States: N. p., 2011. Web. doi:10.1063/1.3615709.
Tian, Zhiting, Esfarjani, Keivan, Shiomi, Junichiro, Henry, Asegun S., & Chen, Gang. On the importance of optical phonons to thermal conductivity in nanostructures. United States. doi:10.1063/1.3615709.
Tian, Zhiting, Esfarjani, Keivan, Shiomi, Junichiro, Henry, Asegun S., and Chen, Gang. Fri . "On the importance of optical phonons to thermal conductivity in nanostructures". United States. doi:10.1063/1.3615709. https://www.osti.gov/servlets/purl/1386828.
@article{osti_1386828,
title = {On the importance of optical phonons to thermal conductivity in nanostructures},
author = {Tian, Zhiting and Esfarjani, Keivan and Shiomi, Junichiro and Henry, Asegun S. and Chen, Gang},
abstractNote = {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. 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.},
doi = {10.1063/1.3615709},
journal = {Applied Physics Letters},
number = 5,
volume = 99,
place = {United States},
year = {2011},
month = {8}
}

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Cited by: 60 works
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Works referenced in this record:

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