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arXiv 1606.08591cond-mat.mes-hall
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共振杂化使硅薄膜热导率降低两个数量级

Two orders of magnitude reduction in silicon membrane thermal conductivity by resonance hybridizations

Hossein Honarvar, Mahmoud I. Hussein

摘要:

通过在一个或两个表面上附着纳米级柱,可以显著降低独立式单晶硅膜的热导率。纳米柱的原子共振与基底膜声子模式局部地和固有地耦合,使得这些模式在声子能带结构中的每个耦合位置处杂交和平坦化。随后的群速度降低,原则上可以被调整为在硅的整个光谱上发生,导致基膜中的面内热导率降低。使用平衡分子动力学模拟,我们报告了一个惊人的两个数量级的减少,在室温下的热导率由这种机制。

英文摘要:

The thermal conductivity of a freestanding single-crystal silicon membrane may be reduced significantly by attaching nanoscale pillars on one or both surfaces. Atomic resonances of the nanopillars locally and intrinsically couple with the base membrane phonon modes causing these modes to hybridize and flatten at each coupling location in the phonon band structure. The ensuing group velocity reductions, which in principle may be tuned to take place across silicon's full spectrum, lead to a lowering of the in-plane thermal conductivity in the base membrane. Using equilibrium molecular dynamics simulations, we report a staggering two orders of magnitude reduction in the thermal conductivity at room temperature by this mechanism.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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