Department of Electrical Engineering, Bourns College of Engineering, University of California, Riverside, CA 92521, USA.
J Phys Condens Matter. 2012 Jun 13;24(23):233203. doi: 10.1088/0953-8984/24/23/233203. Epub 2012 May 4.
Properties of phonons-quanta of the crystal lattice vibrations-in graphene have recently attracted significant attention from the physics and engineering communities. Acoustic phonons are the main heat carriers in graphene near room temperature, while optical phonons are used for counting the number of atomic planes in Raman experiments with few-layer graphene. It was shown both theoretically and experimentally that transport properties of phonons, i.e. energy dispersion and scattering rates, are substantially different in a quasi-two-dimensional system such as graphene compared to the basal planes in graphite or three-dimensional bulk crystals. The unique nature of two-dimensional phonon transport translates into unusual heat conduction in graphene and related materials. In this review, we outline different theoretical approaches developed for phonon transport in graphene, discuss contributions of the in-plane and cross-plane phonon modes, and provide comparison with available experimental thermal conductivity data. Particular attention is given to analysis of recent results for the phonon thermal conductivity of single-layer graphene and few-layer graphene, and the effects of the strain, defects, and isotopes on phonon transport in these systems.
最近，物理学家和工程师们对石墨烯晶格振动的量子——声子的性质产生了浓厚的兴趣。在室温附近，声子是石墨烯中的主要热载体，而在拉曼实验中，光学声子用于计算少层石墨烯的原子层数量。理论和实验都表明，与石墨的基面或三维体晶体相比，在类似石墨烯的准二维系统中，声子的输运性质，即能量色散和散射率，有很大的不同。二维声子输运的独特性质转化为石墨烯及相关材料中异常的热传导。在这篇综述中，我们概述了用于石墨烯中声子输运的不同理论方法，讨论了平面内和平面间声子模式的贡献，并与现有的实验热导率数据进行了比较。特别关注对单层和少层石墨烯的声子热导率的最新结果的分析，以及应变、缺陷和同位素对这些系统中声子输运的影响。
