Thermal conductance boost in phononic crystal nanostructures
Thermal conductance boost in phononic crystal nanostructures
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DOI：
10.1103/physrevb.91.245417
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发表时间：
2015-06
影响因子：
3.7
通讯作者：
R. Anufriev;M. Nomura
中科院分区：
文献类型：
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作者：
R. Anufriev;M. Nomura
对薄膜声子晶体纳米结构（也称为热晶体）中的相干声子散射进行了理论研究。通常认为声子晶体可能只会降低材料的热导率。在这篇理论论文中，与这一假设相反，我们证明了声子纳米图案化在一定条件下可以增强薄膜的热导率。也就是说，它示出了具有许多孔的薄膜可以具有比未图案化的膜更高的热导率。这种效应源于声子色散的相干修正引起的态密度的增加。这种违反直觉的现象，称为热导增强效应，可用于涉及声子管理的应用。
A theoretical study of coherent phonon scattering in thin-film phononic-crystal nanostructures (also called thermocrystals) is presented. It is commonly assumed that phononic crystals may only reduce thermal conductivity of materials. In this theoretical paper, contrary to this assumption, we demonstrate that phononic nanopatterning can enhance the thermal conductance of thin films under certain conditions. That is to say, it is shown that a thin membrane with many holes can have a higher thermal conductance than an unpatterned membrane. This effect originates from the increase in the density of states due to the coherent modifications of phonon dispersion. This counterintuitive phenomenon, called the thermal conductance boost effect, can be used for applications involving phonon management.