纳米声子超材料在热流调节中的邻近效应

IF 6.5 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Jian Zhang, Haochun Zhang, Gang Zhang
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引用次数: 0

摘要

最近的研究表明,构建纳米声子超材料可以在不影响电性能的情况下降低热导率,使其在能量转换和热管理等许多领域具有应用前景。然而,尽管对纳米声子超材料的热导率降低进行了广泛的研究,但其局部热流密度特性仍不清楚。在这项工作中,我们构建了一个包含硅柱的硅纳米膜的热流通量调节器。该调节器具有显著的热流调节能力,并探讨了影响调节能力的各种因素。令人惊讶的是,即使在没有纳米柱的区域,局部热流仍然低于原始硅纳米膜,这是由于邻近的纳米柱通过热邻近效应而降低的。我们将声子参与比的分析与局域声子模式的强度相结合,以提供一个清晰的解释。我们的研究结果不仅为纳米声子超材料的热流调节机制提供了新的见解,而且为热管理、热电能量转换、热斗篷和热集中器等广泛应用的局部热流控制开辟了新的研究方向。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Nanophononic metamaterials induced proximity effect in heat flux regulation

Nanophononic metamaterials induced proximity effect in heat flux regulation

Recent studies have shown that the construction of nanophononic metamaterials can reduce thermal conductivity without affecting electrical properties, making them promising in many fields of application, such as energy conversion and thermal management. However, although extensive studies have been carried out on thermal conductivity reduction in nanophononic metamaterials, the local heat flux characteristic is still unclear. In this work, we construct a heat flux regulator which includes a silicon nanofilm with silicon pillars. The regulator has remarkable heat flux regulation ability, and various impacts on the regulation ability are explored. Surprisingly, even in the region without nanopillars, the local heat current is still lower than that in pristine silicon nanofilms, reduced by the neighboring nanopillars through the thermal proximity effect. We combine the analysis of the phonon participation ratio with the intensity of localized phonon modes to provide a clear explanation. Our findings not only provide insights into the mechanisms of heat flux regulation by nanophononic metamaterials, but also will open up new research directions to control local heat flux for a broad range of applications, including heat management, thermoelectric energy conversion, thermal cloak, and thermal concentrator.

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来源期刊
Frontiers of Physics
Frontiers of Physics PHYSICS, MULTIDISCIPLINARY-
CiteScore
9.20
自引率
9.30%
发文量
898
审稿时长
6-12 weeks
期刊介绍: Frontiers of Physics is an international peer-reviewed journal dedicated to showcasing the latest advancements and significant progress in various research areas within the field of physics. The journal's scope is broad, covering a range of topics that include: Quantum computation and quantum information Atomic, molecular, and optical physics Condensed matter physics, material sciences, and interdisciplinary research Particle, nuclear physics, astrophysics, and cosmology The journal's mission is to highlight frontier achievements, hot topics, and cross-disciplinary points in physics, facilitating communication and idea exchange among physicists both in China and internationally. It serves as a platform for researchers to share their findings and insights, fostering collaboration and innovation across different areas of physics.
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