Thermal transport in SiGe superlattice thin films and nanowires: Effects of specimen and periodic lengths

Keng-Hua Lin; Alejandro Strachan

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Thermal transport in SiGe superlattice thin films and nanowires: Effects of specimen and periodic lengths

机译：SiGe超晶格薄膜和纳米线中的热传输：样品和周期长度的影响

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We compute the thermal conductivity of superlattice (SL) thin films and nanowires for various SL periods and total specimen lengths using nonequilibrium molecular dynamics. Both types of materials exhibit similar behaviors with respect to SL period but the thermal conductivity of the thin films exhibits a significantly higher sensitivity to the specimen length. Notably, the thermal conductivity of SL thin films is smaller than those of the corresponding nanowires for specimen lengths below approximately 35 nm. These results arise from the complex dependence of the conductivities of the interfaces and the SL components on the specimen size and period. These trends and observations are explained using a simple phonon model that builds on the relationship between the cumulative thermal conductivity and the phonon wavelength.

机译：我们使用非平衡分子动力学计算了不同晶格周期和总样本长度下的超晶格（SL）薄膜和纳米线的热导率。两种材料相对于SL周期都表现出相似的行为，但是薄膜的热导率对样品长度显示出明显更高的灵敏度。值得注意的是，对于低于约35 nm的样品长度，SL薄膜的热导率小于相应的纳米线的热导率。这些结果是由于界面电导率和SL成分的电导率对样品尺寸和周期的复杂依赖性而产生的。使用简单的声子模型解释了这些趋势和观察结果，该模型建立在累积热导率和声子波长之间的关系上。

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来源
《Physical review》 |2013年第11期|115302.1-115302.9|共9页
作者
Keng-Hua Lin; Alejandro Strachan;
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作者单位

School of Materials Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA;

School of Materials Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA;

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正文语种 eng
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关键词
superlattices;

机译：超晶格;

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Thermal transport in SiGe superlattice thin films and nanowires: Effects of specimen and periodic lengths

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