arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.13779cond-mat.mes-hall
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利用三维声子晶体调控热导

Controlling thermal conductance using three-dimensional phononic crystals

Samuli Heiskanen, Tuomas Puurtinen, Ilari J. Maasilta

AI总结:

本文实验证明三维声子晶体可在亚开尔文温度下调控并增强热导,无需悬浮器件,且结果超出基于声子能带相干修正的简单理论解释。

摘要:

在纳米尺度上控制热输运对许多应用至关重要。此前已有研究表明,对于悬浮器件的情形,可以通过周期性纳米结构的二维声子晶体实现这种控制。本文中我们证明,热导也可以利用三维声子晶体进行调控,从而在未来无需悬浮即可设计更多种类器件的热接触。我们展示了在亚开尔文温度下对两种不同周期的三维晶体以及一个块体对照结构进行测量的实验结果。结果表明,在我们的几何构型中,声子晶体结构可以增强热导。这一结果无法完全由考虑声子能带结构相干修正的最简单理论所解释,该理论通过有限元方法模拟计算得到。

英文摘要:

Controlling thermal transport at the nanoscale is vital for many applications. Previously, it has been shown that this control can be achieved with periodically nanostructured two-dimensional phononic crystals, for the case of suspended devices. Here we show that thermal conductance can also be controlled with three-dimensional phononic crystals, allowing the engineering of the thermal contact of more varied devices without the need of suspension in the future. We show experimental results measured at sub-Kelvin temperatures for two different period three-dimensional crystals, as well as for a bulk control structure. The results show that the conductance can be enhanced with the phononic crystal structures in our geometry. This result cannot be fully explained by the simplest theory taking into account the coherent modification of the phonon band structure, calculated with finite element method simulations.

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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