The observation of the longitudinal wave velocity in a model supercooled liquid
The observation of the longitudinal wave velocity in a model supercooled liquid
复制标题
模型过冷液体中纵波速度的观测
DOI：
10.1080/08927022.2014.932357
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发表时间：
2014
影响因子：
2.1
通讯作者：
樋渡保秋
中科院分区：
文献类型：
--
作者：
村中正;松井淳;樋渡保秋
我们改进了纵波（LW）速度（声速）的非平衡分子动力学测量方法，并将其应用于二维和三维模型系统。等时和绝热条件下，玻璃态和过冷态的LW速度在二维体系和三维体系中均达到，且随温度的升高逐渐增大。在我们之前的论文[4]中，我们分析了在中间时间和长度尺度上的协同运动以依赖于温度的速度传播，并发现它的依赖性与LWs相反。这表明，协同运动以一种不同的声音方式在整个系统中传播。
We have improved the non-equilibrium molecular dynamics measurement for the longitudinal wave (LW) velocity (the speed of sound) and have applied it to a model system in 2D and 3D. The LW velocity at temperature of the glass or supercooled liquid state reaches the range of in the 2D system and in the 3D system, with a gradual increase with increasing temperature under the isochoric and adiabatic conditions. In our previous paper [4] we analysed that the cooperative motion in intermediate time and length scales propagates with a speed depending on temperature and found that its dependency is opposed to that of the LWs. It suggests that the cooperative motion spreads over the system in a different way of sound.