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arXiv 1605.06809cond-mat.soft
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利用主动振荡激发无序系统中的振动软模

Excitation of vibrational soft modes in disordered systems using active oscillation

Elsen Tjhung, Takeshi Kawasaki

摘要:

我们提出了一种新的方法来表征固体中粒子振动的空间分布,与通常的简正模分析相比,具有更低的计算成本。在二维无热阻塞系统中,通过对每个粒子的大小施加一个小振幅的主动振荡,以相同的驱动频率激发特定的振动模式。然后获得作为粒子的实时位移的响应。我们显示出显着的实时位移和传统的正常模式分析得到的特征向量之间的相关性。更重要的是,从这些实时位移中,我们可以测量粒子振动的参与率和空间偏振。从这些测量中,我们发现三个不同的频率制度,其特征的空间分布和相关的颗粒的振动堵塞非晶态固体。此外,我们可以将这种方法应用到一个更大的系统中,以更高的频率空间分辨率来研究非晶态固体的低频行为。

英文摘要:

We propose a new method to characterize the spatial distribution of particles' vibrations in solids with much lower computational costs compared to the usual normal mode analysis. We excite the specific vibrational mode in a two dimensional athermal jammed system by giving a small amplitude of active oscillation to each particle's size with an identical driving frequency. The response is then obtained as the real time displacements of the particles. We show remarkable correlations between the real time displacements and the eigen vectors obtained from conventional normal mode analysis. More importantly, from these real time displacements, we can measure the participation ratio and spatial polarization of particles' vibrations. From these measurements, we find three distinct frequency regimes which characterize the spatial distribution and correlation of particles' vibrations in jammed amorphous solids. Furthermore, we can possibly apply this method to a much larger system to examine the low frequency behaviour of amorphous solids with a much higher resolution of the frequency space.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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