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Green's function studies of phonon transport across Si/Ge superlattices

Author(s)
Tian, Zhiting; Esfarjani, Keivan; Chen, Gang
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Abstract
Understanding and manipulating coherent phonon transport in solids is of interest both for enhancing the fundamental understanding of thermal transport as well as for many practical applications, including thermoelectrics. In this study, we investigate phonon transmission across Si/Ge superlattices using the Green's function method with first-principles force constants derived from ab initio density functional theory. By keeping the period thickness fixed while changing the number of periods, we show that interface roughness partially destroys coherent phonon transport, especially at high temperatures. The competition between the low-frequency coherent modes and high-frequency incoherent modes leads to an optimum period length for minimum thermal conductivity. To destroy coherence of the low-frequency modes, scattering length scale on the order of period length is required. This finding is useful to guide the design of superlattices to reach even lower thermal conductivity.
Date issued
2014-06
URI
http://hdl.handle.net/1721.1/88650
Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Journal
Physical Review B
Publisher
American Physical Society
Citation
Tian, Zhiting, Keivan Esfarjani, and Gang Chen. “Green’s Function Studies of Phonon Transport Across Si/Ge Superlattices.” Phys. Rev. B 89, no. 23 (June 2014). © 2014 American Physical Society
Version: Final published version
ISSN
1098-0121
1550-235X

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