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arXiv 1502.00685cond-mat.softcond-mat.dis-nn
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无序固体中的解纠缠缺陷和声模

Disentangling defects and sound modes in disordered solids

Sven Wijtmans, M. Lisa Manning

摘要:

我们发展了一种新的方法来隔离局域缺陷的扩展振动模式在无序固体。这种方法用一个充当高通滤波器的人工势来增强粒子的相互作用:它保留了小尺度结构,同时将扩展的振动模式推向更高的频率。剩下的低频模式是“裸”缺陷;它们是指数局部化的,没有与弹性相互作用相关的四极尾。我们证明,这些本地化的激发是很好的预测塑料重排的固体。我们描述了这些缺陷中出现在介观塑性理论中的几个属性,包括它们的能垒分布,数密度和尺寸,这是测试和修改无序固体中塑性连续模型的第一步。

英文摘要:

We develop a new method to isolate localized defects from extended vibrational modes in disordered solids. This method augments particle interactions with an artificial potential that acts as a high-pass filter: it preserves small-scale structures while pushing extended vibrational modes to higher frequencies. The low-frequency modes that remain are "bare" defects; they are exponentially localized without the quadrupolar tails associated with elastic interactions. We demonstrate that these localized excitations are excellent predictors of plastic rearrangements in the solid. We characterize several of the properties of these defects that appear in mesoscopic theory of plasticity, including their distribution of energy barriers, number density, and size, which is a first step in testing and revising continuum models for plasticity in disordered solids.

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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