Theoretical description of thermal transport in graphene: The issues of phonon cut-off frequencies and polarization branches
Theoretical description of thermal transport in graphene: The issues of phonon cut-off frequencies and polarization branches
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DOI：
10.1002/pssb.201100186
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发表时间：
2011-11-01
影响因子：
1.6
通讯作者：
Balandin, Alexander A.
中科院分区：
文献类型：
--
作者：
Nika, Denis L.;Pokatilov, Evghenii P.;Balandin, Alexander A.
我们讨论的声子热输运在石墨烯的描述和确定开放的问题和问题的理论方法。具体来说，我们表明，由于一个基本的模糊性的定义的固有的二维（2-D）系统的热导率的计算，使用任意的下限截止的声子频率的热导率积分导致错误的结果。纵向声学（LA），横向声学（TA），和平面外的声子极化分支的热输运的相对贡献的问题也进行了讨论。石墨烯的理论热导率数据，通过不同的方法获得的，与碳纳米管。(C)2011 WILEY-VCH Verlag GmbH & Co. KGaA，魏因海姆
We discuss theoretical approaches for description of the phonon thermal transport in graphene and identify open questions and problems. Specifically, we show that due to a fundamental ambiguity in the definition of the intrinsic thermal conductivity of two-dimensional (2-D) systems the calculations that use an arbitrary low-bound cut-off for the phonon frequency in the thermal conductivity integral lead to erroneous results. The problem of the relative contributions of the longitudinal acoustic (LA), transverse acoustic (TA), and out-of-plane phonon polarization branches to thermal transport in graphene is also discussed. Theoretical thermal conductivity data for graphene, obtained by different approaches, are compared with those for carbon nanotubes. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim