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arXiv 1809.09808cond-mat.mes-hallphysics.app-ph
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硅纳米线中Lévy声子飞行引起的准弹道热传导

Quasi-ballistic heat conduction due to Lévy phonon flights in silicon nanowires

Roman Anufriev, Sergei Gluchko, Sebastian Volz, Masahiro Nomura

摘要:

解决散热问题是硅基微电子的未来。解决方案可能在于称为弹道热传导的纳米级现象,这意味着在不加热导体的情况下进行热传导。但是,试图证明这一现象的实验是有争议的和稀缺的,而其机制在受限的纳米结构尚未得到充分理解。在这里,我们实验证明准弹道热传导硅纳米线(NW)。我们发现,弹道是最强的短NW在低温下,但减弱NW长度或温度的增加。然而,即使在室温下,准弹道热传导在短纳米线中仍然可见。为了更好地理解这种现象,我们探测声子飞行的方向性和长度。我们的实验和模拟表明,准弹道声子输运在NW边界之间的短飞行和长的弹道跳跃沿NW的Lévy步行。

英文摘要:

Future of silicon-based microelectronics relies on solving the heat dissipation problem. A solution may lie in a nanoscale phenomenon known as ballistic heat conduction, which implies heat conduction without heating the conductor. But, attempts to demonstrate this phenomenon experimentally are controversial and scarce whereas its mechanism in confined nanostructures is yet to be fully understood. Here, we experimentally demonstrate quasi-ballistic heat conduction in silicon nanowires (NWs). We show that the ballisticity is strongest in short NWs at low temperatures but weakens as the NW length or temperature is increased. Yet, even at room temperature, quasi-ballistic heat conduction remains visible in short NWs. To better understand this phenomenon, we probe directionality and lengths of phonon flights. Our experiments and simulations show that the quasi-ballistic phonon transport in NWs is the Lévy walk with short flights between the NW boundaries and long ballistic leaps along the NW.

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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