Colloquium: Phononic thermal properties of two-dimensional materials
Colloquium: Phononic thermal properties of two-dimensional materials
复制标题
学术讨论会：二维材料的声子热性质
DOI：
10.1103/revmodphys.90.041002
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发表时间：
2018-11-13
影响因子：
44.1
通讯作者：
Yang, Ronggui
中科院分区：
文献类型：
--
作者：
Gu, Xiaokun;Wei, Yujie;Yang, Ronggui
随着石墨烯以外的许多新型二维（2D）材料的出现，人们对探索基础物理和实际应用的影响越来越感兴趣，这些应用包括电子学、光子学和声子学，以及热管理和能量存储。在本次学术讨论会中，总结和比较了具有单层石墨烯的原始2D材料的声子性质，如声子色散和弛豫时间，以了解晶体结构和尺寸对热导率的作用。比较的声子性质，对比理想化的2D晶体，现实的2D晶体，和3D晶体，并综合这发展的二维材料的样品尺寸如何影响其热导率的物理图片。的几何形状，如层数和纳米晶的宽度，连同缺陷的存在下，机械应变，和基板上的热性能的相互作用的影响进行了讨论。插层影响层状晶体的群速度和声子弛豫时间，从而沿贯穿面和基面方向沿着调谐热导率。本次学术讨论会最后讨论了二维材料热传输理论和实验研究中的挑战。二维材料中丰富而特殊的声子物理使它们成为探索拓扑声子效应等新现象和声子量子器件等应用的有希望的候选者。
Following the emergence of many novel two-dimensional (2D) materials beyond graphene, interest has grown in exploring implications for fundamental physics and practical applications ranging from electronics, photonics, and phononics to thermal management and energy storage. In this Colloquium, a summary and comparison are given of the phonon properties, such as phonon dispersion and relaxation time, of pristine 2D materials with single-layer graphene to understand the role of crystal structure and dimension on thermal conductivity. A comparison is made of the phonon properties, contrasting idealized 2D crystals, realistic 2D crystals, and 3D crystals, and synthesizing this to develop a physical picture of how the sample size of 2D materials affects their thermal conductivity. The effects of geometry such as the number of layers and the nanoribbon width, together with the presence of defects, mechanical strain, and substrate interactions on the thermal properties of 2D materials are discussed. Intercalation affects both the group velocities and phonon relaxation times of layered crystals and thus tunes the thermal conductivity along both the through-plane and basal-plane directions. This Colloquium concludes with a discussion of the challenges in theoretical and experimental studies of thermal transport in 2D materials. The rich and special phonon physics in 2D materials make them promising candidates for exploring novel phenomena such as topological phonon effects and applications such as phononic quantum devices.