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arXiv 2103.03051cond-mat.mtrl-sci
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二维MoO $_3$中的超低热导率

Ultralow thermal conductivity in two-dimensional MoO$_3$

Zhen Tong, Traian Dumitrică, Thomas Frauenheim

摘要:

单层三氧化钼(MoO $_3$)是一种新兴的具有高导电性的二维(2D)材料。使用第一性原理计算和玻尔兹曼输运理论框架,我们预测记录低室温声子热导率($κ_p$)的1.57 W/mK和1.26 W/mK沿主面内方向的MoO $_3$单层。该行为归因于软弯曲和面内声学模式的组合,其通过有限的层厚度耦合,并且归因于强的成键非谐性,其引起显著的3-和4-声子散射事件。这些见解提出了指导低$κ_p$二维材料搜索的新指标。我们的研究结果激励实验$κ_p$测量钼$_3$,其应用作为热电和热保护材料。

英文摘要:

Monolayer molybdenum trioxide (MoO$_3$) is an emerging two-dimensional (2D) material with high electrical conductivity. Using first-principles calculations and a Boltzmann transport theoretical framework, we predict record low room-temperature phonon thermal conductivity ($κ_p$) of 1.57 W/mK and 1.26 W/mK along the principal in-plane directions of MoO$_3$ monolayer. The behavior is attributed to the combination of soft flexural and in-plane acoustic modes, which are coupled through the finite layer thickness, and to the strong bonding anharmonicity, which gives rise to significant 3- and 4-phonon scattering events. These insights suggest new indicators for guiding the search of 2D materials with low $κ_p$. Our result motivates experimental $κ_p$ measurements in MoO$_3$, and its applications as a thermoelectric and thermally protective material.

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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