期刊
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
卷 135, 期 9, 页码 -出版社
ASME
DOI: 10.1115/1.4024356
关键词
phonon dispersion; phonon lifetime; bismuth telluride; thermal conductivity
资金
- National Science Foundation
- Air Force Office of Scientific Research
Thermal properties and transport control are important for many applications, for example, low thermal conductivity is desirable for thermoelectrics. Knowledge of mode-wise phonon properties is crucial to identify dominant phonon modes for thermal transport and to design effective phonon barriers for thermal transport control. In this paper, we adopt time-domain (TD) and frequency-domain (FD) normal-mode analyses to investigate mode-wise phonon properties and to calculate phonon dispersion relations and phonon relaxation times in bismuth telluride. Our simulation results agree with the previously reported data obtained from ultrafast time-resolved measurements. By combining frequency-dependent anharmonic phonon group velocities and lifetimes, mode-wise thermal conductivities are predicted to reveal the contributions of heat carriers with different wavelengths and polarizations.
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