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首页> 外文期刊>Philosophical magazine, B. Physics of condensed matter, electronic, optical, and magnetic properties >Numerical study of the low-frequency atomic dynamics in a Lennard-Jones glass
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Numerical study of the low-frequency atomic dynamics in a Lennard-Jones glass

机译:Lennard-Jones玻璃中低频原子动力学的数值研究

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We present a computer simulation study of a monatomic glass model. The investigated system consists of up to 32000 'argon' atoms, interacting via a Lennard-Jones potential. Its dynamical properties have been investigated both by the time evolution of the atomic trajectories during molecular dynamics runs at low temperature and by the normal mode analysis (NMA) in the inherent configuration. In the NMA, we used both the direct diagonalization of the dynamical matrix and the spectral moment method. The vibrational density of states (DOS), the dynamic structure factors, the Raman spectrum and the spatial patterns of the eigenmodes have been calculated. The Raman spectrum shows the characteristic bump, that is the so-called 'boson peak', at frequencies where the DOS presents an excess of states with respect to the Debye behaviour. By the analysis of the previous dynamical quantities and from the direct inspection of the pattern of the eigenvectors, we derive a consistent picture of the atomic dynamics in the boson peak energy region. [References: 12]
机译:我们提出了单原子玻璃模型的计算机仿真研究。被研究的系统包含多达32000个“氩”原子,它们通过Lennard-Jones势相互作用。通过在低温下进行分子动力学过程中原子轨迹的时间演化以及通过固有结构中的正态分析(NMA),研究了它的动力学性质。在NMA中,我们同时使用了动态矩阵的直接对角化和频谱矩方法。计算了态的振动密度(DOS),动态结构因子,拉曼光谱和本征模的空间模式。拉曼光谱在DOS表现出比德拜行为更多的状态的频率处显示出特征性的凸起,即所谓的“玻色子峰”。通过分析先前的动力学量并直接检查特征向量的模式,我们得出了玻色子峰值能量区域中原子动力学的一致图像。 [参考:12]

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