On the importance of optical phonons to thermal conductivity in nanostructures | Zendy

Zhiting Tian | Zendy; Keivan Esfarjani | Zendy; Junichiro Shiomi | Zendy; Asegun Henry | Zendy; Gang Chen | Zendy

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On the importance of optical phonons to thermal conductivity in nanostructures

Author(s) -

Zhiting Tian,

Keivan Esfarjani,

Junichiro Shiomi,

Asegun Henry,

Gang Chen

Publication year - 2011

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.3615709

Subject(s) - phonon , thermal conductivity , materials science , condensed matter physics , nanoscopic scale , nanostructure , silicon , optoelectronics , nanotechnology , physics , composite material

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.United States. Dept. of Energy. Office of Basic Energy Sciences (Award DE-SC0001299)United States. Dept. of Energy. Office of Basic Energy Sciences (Award DE-FG02-09ER46577

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