Casimir极限下波纹硅纳米线中的声子热传导
Phonon Heat Conduction in Corrugated Silicon Nanowires Below the Casimir Limit
摘要：
在0.3 ~ 5 K温度范围内测量了直形和波纹形单晶硅纳米线的热导率。波纹状纳米线和直纳米线之间的热输运的差异表明声子的平均自由程的强烈减少。这个平均的平均自由程是显着小于较小的直径的纳米线，证明声子的热输运降低到卡西米尔极限以下。蒙特卡罗模拟强调，这种效果可以归因于显着的多重散射的弹道声子发生在波纹表面。这一结果表明了一种将单晶材料转化为声子玻璃的原始方法。
英文摘要：
The thermal conductance of straight and corrugated monocrystalline silicon nanowires has been measured between 0.3 K and 5 K. The difference in the thermal transport between corrugated nanowires and straight ones demonstrates a strong reduction in the mean free path of the phonons. This averaged mean free path is remarkably smaller than the smaller diameter of the nanowire, evidencing a phonon thermal transport reduced below the Casimir limit. Monte Carlo simulations highlight that this effect can be attributed to significant multiple scattering of ballistic phonons occuring on the corrugated surfaces. This result suggests an original approach to transforming a monocrystalline material into a phonon glass.
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