We report an exciting behavior of H-shaped single layer graphene structures subject to a heat flux. H-shaped graphene structures with certain particular dimensions were observed to be able to establish coherent mechanical vibrations in the out-of-plane direction directly from a steady state heat flux flowing from the centerline of the structure towards the two ends. Molecular dynamics (MD) simulation methods together with phonon spectral energy density (SED) analysis techniques were used to obtain the phonon dispersion profiles and identify the low frequency high energy phonon modes. Based on these calculations, we proposed a hypothesis that the mechanical vibration is the result of the superposition of the high energy out-of-plane acoustic (ZA mode) phonons traveling in opposite directions via scattering mechanisms. By using a theoretical model based on the superposition principle, we reproduced the vibrational mode of the graphene structure observed in the MD simulation and verified the proposed hypothesis.

中文翻译：

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H型单层石墨烯结构的热通量相​​干振动

我们报告了受热通量影响的H形单层石墨烯结构的令人兴奋的行为。观察到具有某些特定尺寸的H形石墨烯结构能够直接从从结构中心线向两端流动的稳态热通量，在面外方向建立相干机械振动。分子动力学（MD）模拟方法与声子光谱能量密度（SED）分析技术一起用于获得声子色散分布图并识别低频高能声子模式。基于这些计算，我们提出了一个假设，即机械振动是高能平面声子（ZA模式）声子通过散射机制。通过使用基于叠加原理的理论模型，我们再现了在MD模拟中观察到的石墨烯结构的振动模式，并验证了所提出的假设。