Coherent Thermal Conduction in Silicon Nanowires with Periodic Wings
Coherent Thermal Conduction in Silicon Nanowires with Periodic Wings
复制标题
DOI：
10.3390/nano9020142
复制
发表时间：
2019-02-01
期刊：
影响因子：
5.3
通讯作者：
Nomura, Masahiro
中科院分区：
文献类型：
--
作者：
Anufriev, Roman;Nomura, Masahiro
人工周期性纳米结构被称为声子晶体，有望在相干区域控制纳米结构的热性质，这可以在低温下在半导体中实现。在这里，我们研究了在亚开尔文温度下添加周期翼的硅纳米线中的相干热传导。我们的模拟表明，附加的周期翼使声子色散变平，从而降低了热导。我们研究了这种折减与机翼大小的依赖关系，得出的结论是，这种折减主要是由机翼的周期性引起的，而不是由机翼的局部共振引起的。这些发现有助于更好地理解周期性共振纳米结构中相干导热的控制机制。
Artificial periodic nanostructures, known as phononic crystals, promise to control the thermal properties of nanostructures in the coherent regime, which can be achieved in semiconductors at low temperatures. Here, we study coherent thermal conduction in silicon nanowires with added periodic wings at sub-Kelvin temperature. Our simulations show that the added periodic wings flatten the phonon dispersion and thus reduce the thermal conductance. We investigate the dependence of this reduction on the size of the wings and conclude that the reduction is mainly caused by the periodicity of the wings, rather than by local resonances in them. These findings help to better understand the mechanisms controlling coherent heat conduction in periodic resonant nanostructures.