Excess Vibrational Modes and the Boson Peak in Model Glasses
Excess Vibrational Modes and the Boson Peak in Model Glasses
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DOI：
10.1103/physrevlett.98.175502
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发表时间：
2006-11
影响因子：
8.6
通讯作者：
N. Xu;M. Wyart;Andrea J. Liu;S. Nagel
中科院分区：
文献类型：
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作者：
N. Xu;M. Wyart;Andrea J. Liu;S. Nagel
本文研究了两种常用玻璃模型在零温下的过剩低频简正模。这两个系统的异常模式的发病频率同意以及与预测的变分参数，这是基于分析的振动能量，从多余的接触，每个粒子的机械稳定性所需的最小数量。尽管研究的两种玻璃都具有高配位数，但大多数额外的接触可以被认为是弱的。我们对液体的理解是基于这样一种想法，即液体结构在很大程度上取决于强烈的短程排斥，而长程吸引可以被视为微扰[1]。类似的考虑被用来研究在零温度下作为密度函数的干扰[2，3]。当势是排斥势且有一个有限的范围时，会出现一个急剧的阻塞跃迁
The excess low-frequency normal modes for two widely used models of glasses are studied at zero temperature. The onset frequencies for the anomalous modes for both systems agree well with predictions of a variational argument, which is based on analyzing the vibrational energy originating from the excess contacts per particle over the minimum number needed for mechanical stability. Even though both glasses studied have a high coordination number, most of the additional contacts can be considered to be weak. Our understanding of liquids is based on the idea that liquid structure is largely determined by strong shortranged repulsions and that the longer-ranged attractions can be treated as a perturbation [1]. Similar considerations were used to study jamming at zero temperature as a function of density � [2,3]. When potentials are repulsive and have a finite range, there is a sharp jamming transition