Excitation of intrinsic localized modes in a graphene sheet
Excitation of intrinsic localized modes in a graphene sheet
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DOI：
10.1209/0295-5075/80/40008
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发表时间：
2007-11
期刊：
影响因子：
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通讯作者：
Yu Yamayose;Y. Kinoshita;Y. Doi;A. Nakatani;T. Kitamura
中科院分区：
文献类型：
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作者：
Yu Yamayose;Y. Kinoshita;Y. Doi;A. Nakatani;T. Kitamura
为了研究实际材料中本征局域模的激发，我们利用基于Brenner势的分子动力学模拟方法分析了石墨烯薄层的二维振动。在1.0ps的几个区域内观察到了能量局域化。在局部产生了相当恒定的振动模，其中相邻的两个原子以相反的方向振动。局域振动的频率超过声子带的上界，模式类似于本征模之一。局域振动保持在相同的位置，并在相当长的时间内(26个周期)保持该模式。由于所有这些结果都符合ILM的特征，因此可以得出结论：静止的ILM在石墨烯片层中被激发。
In order to examine the excitation of intrinsic localized modes (ILMs) in a real material, we analyze two-dimensional vibration of a graphene sheet using molecular-dynamics simulations based on the Brenner potential. Energy localization is observed in a few regions for 1.0 ps. Fairly constant vibration modes, in which the two neighboring atoms vibrate in the opposite direction, are generated locally. The frequency of the localized vibration exceeds the upper bound of the phonon band and the mode is similar to one of the eigenmodes. The localized vibration remains at the same location and maintains the mode for a fairly long time (26 cycles). Since all of these results correspond to the characteristic features of ILM, it is concluded that the stationary ILM is excited in the graphene sheet.