Nanophononic Metamaterial: Thermal Conductivity Reduction by Local Resonance

被引:247
作者
Davis, Bruce L. [1 ]
Hussein, Mahmoud I. [1 ]
机构
[1] Univ Colorado, Dept Aerosp Engn Sci, Boulder, CO 80309 USA
基金
美国国家科学基金会;
关键词
PHONON HEAT-CONDUCTION; BAND-STRUCTURE; SILICON; NANOWIRES;
D O I
10.1103/PhysRevLett.112.055505
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present the concept of a locally resonant nanophononic metamaterial for thermoelectric energy conversion. Our configuration, which is based on a silicon thin film with a periodic array of pillars erected on one or two of the free surfaces, qualitatively alters the base thin-film phonon spectrum due to a hybridization mechanism between the pillar local resonances and the underlying atomic lattice dispersion. Using an experimentally fitted lattice-dynamics-based model, we conservatively predict the metamaterial thermal conductivity to be as low as 50% of the corresponding uniform thin-film value despite the fact that the pillars add more phonon modes to the spectrum.
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页数:5
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