Modulating Near-Field Radiative Heat Transfer through Thin Dirac Semimetal Films

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL Nanoscale and Microscale Thermophysical Engineering Pub Date : 2021-04-03 DOI:10.1080/15567265.2021.1926607

Guoding Xu, Jian Sun, Hongmin Mao, Z. Cao, Xiying Ma

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引用次数: 2

Abstract

ABSTRACT We propose a thermal modulation structure made of two identical SiO2 slabs coated by Dirac semimetal (DSM) films and separated by a nanoscale vacuum gap. The energy transmission probability reveals that the coupled surface plasmon polaritons (SPPs) between the two DSM films, and the surface phonon polaritons (SPhPs) supported by the SiO2 substrate can vary sensitively with the Fermi level, the degenerate factor of 3D Dirac points and the thickness of the DSM film, thus providing the possibilities for modulating the radiative heat transfer by tuning these parameters. Based on Maxwell’s equations incorporating fluctuational electrodynamics, the effects of these parameters on the heat transfer coefficient and the thermal modulation contrast are numerically analyzed. Under proper parameters, higher modulation contrasts are obtained by continuously tuning the Fermi level from 0.05 eV to 0.3 eV. The obtained results might be helpful in designing a DSM-based thermal modulator with higher modulation contrasts.

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通过薄狄拉克半金属薄膜调制近场辐射传热

摘要:本文提出了一种热调制结构，该结构由两个相同的SiO2板组成，表面涂有Dirac半金属(DSM)薄膜，并以纳米级真空间隙隔开。能量传输概率表明，两种DSM薄膜之间耦合的表面等离子体激元(SPPs)和SiO2衬底支撑的表面声子激元(SPPs)随费米能级、三维狄拉克点的简并因子和DSM薄膜的厚度发生敏感变化，从而为调节这些参数来调节辐射传热提供了可能。基于波动电动力学麦克斯韦方程组，数值分析了这些参数对换热系数和热调制对比的影响。在适当的参数下，将费米能级从0.05 eV连续调谐到0.3 eV，可以获得更高的调制对比度。所得结果可为设计具有较高调制对比度的基于dsm的热调制器提供参考。

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来源期刊

Nanoscale and Microscale Thermophysical Engineering 工程技术-材料科学：表征与测试

CiteScore

5.90

自引率

2.40%

发文量

审稿时长

3.3 months

期刊介绍： Nanoscale and Microscale Thermophysical Engineering is a journal covering the basic science and engineering of nanoscale and microscale energy and mass transport, conversion, and storage processes. In addition, the journal addresses the uses of these principles for device and system applications in the fields of energy, environment, information, medicine, and transportation. The journal publishes both original research articles and reviews of historical accounts, latest progresses, and future directions in this rapidly advancing field. Papers deal with such topics as: transport and interactions of electrons, phonons, photons, and spins in solids, interfacial energy transport and phase change processes, microscale and nanoscale fluid and mass transport and chemical reaction, molecular-level energy transport, storage, conversion, reaction, and phase transition, near field thermal radiation and plasmonic effects, ultrafast and high spatial resolution measurements, multi length and time scale modeling and computations, processing of nanostructured materials, including composites, micro and nanoscale manufacturing, energy conversion and storage devices and systems, thermal management devices and systems, microfluidic and nanofluidic devices and systems, molecular analysis devices and systems.