Thermal Transport in a 2D Amorphous Material

IF 15.7 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Yuxi Wang, Nianjie Liang, Xingxing Zhang, Wujuan Yan, Haiyu He, Alfredo Fiorentino, Xinwei Tao, Ang Li, Fuwei Yang, Buxuan Li, Te-Huan Liu, Jia Zhu, Wu Zhou, Wei Wang, Stefano Baroni, Lin Zhou, Bai Song
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Abstract

Two-dimensional (2D) crystals proved revolutionary soon after graphene was discovered in 2004. However, 2D amorphous materials down to a single layer of atoms only became accessible in 2020, and they remain largely unexplored. In particular, the thermophysical properties of amorphous materials are of great interest upon transition from 3D to 2D. Here, we probe and simulate thermal transport in monolayer amorphous carbon (MAC). An ultralow cross-plane thermal conductivity (κ) is measured for van der Waals stacked multilayers, which is comparable to that of randomly stacked graphene despite the extra disorder in MAC. This result reveals the predominant role of the weak interlayer interactions in 2D materials. Meanwhile, an unexpectedly high in-plane κ is obtained for freestanding monolayers, which is a few times higher than what is predicted by conventional wisdom for 3D amorphous carbon with a similar sp2 fraction. This observation is primarily attributed to the dimensionality-induced reduction of anharmonicity and the unique low-frequency out-of-plane vibrational modes in MAC. Amorphous materials at the 2D limit open up new avenues for understanding and manipulating heat at the atomic scale.
二维非晶材料的热输运
2004年石墨烯被发现后不久,二维(2D)晶体被证明是革命性的。然而,直到2020年,只有单层原子的二维非晶材料才得以实现,而且它们在很大程度上仍未被探索。特别是,非晶材料在从3D到2D过渡时的热物理性质引起了极大的兴趣。在这里,我们探测和模拟了单层非晶碳(MAC)的热输运。测量了范德瓦尔斯堆叠多层材料的超低平面导热系数(κ),与随机堆叠的石墨烯相当,尽管MAC中存在额外的无序性。这一结果揭示了弱层间相互作用在二维材料中的主导作用。同时,在独立单层中获得了意想不到的高平面内κ,这比传统智慧预测的具有相似sp2分数的3D无定形碳高出几倍。这一观察结果主要归因于MAC中维数诱导的非调和性降低和独特的低频面外振动模式。二维极限下的非晶态材料为在原子尺度上理解和操纵热量开辟了新的途径。
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来源期刊
Physical Review X
Physical Review X PHYSICS, MULTIDISCIPLINARY-
CiteScore
24.60
自引率
1.60%
发文量
197
审稿时长
3 months
期刊介绍: Physical Review X (PRX) stands as an exclusively online, fully open-access journal, emphasizing innovation, quality, and enduring impact in the scientific content it disseminates. Devoted to showcasing a curated selection of papers from pure, applied, and interdisciplinary physics, PRX aims to feature work with the potential to shape current and future research while leaving a lasting and profound impact in their respective fields. Encompassing the entire spectrum of physics subject areas, PRX places a special focus on groundbreaking interdisciplinary research with broad-reaching influence.
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