Phonon coherent resonance and its effect on thermal transport in core-shell nanowires

被引：90

作者：

Chen, Jie ^{[1
,2
]}

Zhang, Gang ^{[3
,4
]}

Li, Baowen ^{[1
,2
,5
]}

机构：

[1] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[2] Natl Univ Singapore, Ctr Computat Sci & Engn, Singapore 117542, Singapore

[3] Peking Univ, Key Lab Phys & Chem Nanodevices, Beijing 100871, Peoples R China

[4] Peking Univ, Dept Elect, Beijing 100871, Peoples R China

[5] NUS Grad Sch Integrat Sci & Engn, Singapore 117456, Singapore

来源：

JOURNAL OF CHEMICAL PHYSICS | 2011年 / 135卷 / 10期

关键词：

MOLECULAR-DYNAMICS SIMULATION; SILICON NANOWIRES; CONDUCTIVITY; PERFORMANCE; REDUCTION;

D O I：

10.1063/1.3637044

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We study heat current autocorrelation function and thermal conductivity in core-shell nanowires by using molecular dynamics simulations. Interestingly, a remarkable oscillation effect in heat current autocorrelation function is observed in core-shell NWs, while the same effect is absent in pure silicon nanowires, nanotube structures, and random doped nanowires. Detailed characterizations of the oscillation signal reveal that this intriguing oscillation is caused by the coherent resonance effect of the transverse and longitudinal phonon modes. This phonon resonance results in the localization of the longitudinal modes, which leads to the reduction of thermal conductivity in core-shell nanowires. Our study reveals that a coherent mechanism can be used to tune thermal conductivity in core-shell nanowires. (C) 2011 American Institute of Physics. [doi:10.1063/1.3637044]

引用

页数：8

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