Thermal conductance of graphene and dimerite
Thermal conductance of graphene and dimerite
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DOI：
10.1103/physrevb.79.205418
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发表时间：
2009-05-01
影响因子：
3.7
通讯作者：
Li, Baowen
中科院分区：
文献类型：
--
作者：
Jiang, Jin-Wu;Wang, Jian-Sheng;Li, Baowen
在弹道极限下，将石墨烯片作为石墨烯条的大宽度极限，研究了石墨烯的声子热导。我们发现，热导率弱依赖于热通量的方向角θ周期性地与周期π/3。它进一步表明，这种方向依赖性的性质是在石墨烯中的声子模式的群速度的方向依赖性，起源于蜂窝结构中的D-6 h对称性。通过打破石墨烯中的D-6 h对称性，我们看到了更明显的热导各向异性效应，如二聚物所示。
We investigate the phonon thermal conductance of graphene regarding the graphene sheet as the large-width limit of graphene strips in the ballistic limit. We find that the thermal conductance depends weakly on the direction angle theta of the thermal flux periodically with period pi/3. It is further shown that the nature of this directional dependence is the directional dependence of group velocities of the phonon modes in the graphene, originating from the D-6h symmetry in the honeycomb structure. By breaking the D-6h symmetry in graphene, we see more obvious anisotropic effect in the thermal conductance as demonstrated by dimerite.