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arXiv 1010.2271cond-mat.mtrl-sci
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硅纳米粒子的振动态密度

Vibrational density of states of silicon nanoparticles

R. Meyer, D. Comtesse

摘要:

利用分子动力学模拟研究了纳米硅粒子在2.3 ~ 10.3 nm范围内的振动态密度。从这些模拟的振动态密度和频率的高对称点的布里渊区的体状振动模式已被导出。结果表明,在低频率的态密度的增加和模式的转移从频谱的高频端的中间范围。同时,横向光学模式的峰值向更高的频率移动。这些观察结果与以前对金属纳米颗粒的模拟研究一致,它们为以前观察到的实验和理论数据之间的差异提供了解释[C。Meier等人,Physica E,32,155(2006)]。

英文摘要:

The vibrational density of states of silicon nanoparticles in the range from 2.3 to 10.3 nm is studied with the help of molecular-dynamics simulations. From these simulations the vibrational density of states and frequencies of bulk-like vibrational modes at high-symmetry points of the Brillouin-zone have been derived. The results show an increase of the density of states at low frequencies and a transfer of modes from the high-frequency end of the spectrum to the intermediate range. At the same time the peak of transverse optical modes is shifted to higher frequencies. These observations are in line with previous simulation studies of metallic nanoparticles and they provide an explanation for a previously observed discrepancy between experimental and theoretical data [C. Meier et al., Physica E, 32, 155 (2006)].

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