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arXiv 1301.6537cond-mat.mtrl-sci
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纳米石墨烯的振动特性

Vibrational properties of nanographene

Sandeep Kumar Singh, F. M. Peeters

摘要:

采用原子模拟方法计算了石墨烯团簇的基态构型的本征模和振动态密度。采用修正的Brenner势来描述氢钝化边的碳-碳相互作用和碳氢相互作用。对于一个给定的C原子的配置后,对角化的动力学矩阵的元素是势能的二阶导数的简正模的本征向量和本征频率得到。由速度场的发散和旋转得到了压、剪性质。对于对称的缺陷团簇和边缘呈五边形排列的缺陷团簇,最高频率的模式是剪切模式。团簇的比热也计算内的谐波近似和收敛到体石墨烯的结果进行了调查。

英文摘要:

The eigenmodes and the vibrational density of states of the ground state configuration of graphene clusters are calculated using atomistic simulations. The modified Brenner potential is used to describe the carbon-carbon interaction and carbon-hydrogen interaction in case of H-passivated edges. For a given configuration of the C-atoms the eigenvectors and eigenfrequencies of the normal modes are obtained after diagonalisation of the dynamical matrix whose elements are the second derivative of the potential energy. The compressional and shear properties are obtained from the divergence and rotation of the velocity field. For symmetric and defective clusters with pentagon arrangement on the edge, the highest frequency modes are shear modes. The specific heat of the clusters is also calculated within the harmonic approximation and the convergence to the result for bulk graphene is investigated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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