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arXiv 1905.13643cond-mat.dis-nncond-mat.softcond-mat.stat-mech
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玻璃中的低频激发及其局域化特性

Low-frequency excitations and their localization properties in glasses

M. Paoluzzi, L. Angelani

摘要:

除了动力学减慢信号的粘度接近玻璃化转变的巨大增加,结构玻璃在低温下显示出有趣的异常热力学特征,暗示在足够低的频率下与德拜定律的特殊偏差。理论、数值模拟和实验表明,偏离德拜定律是由于填充低频谱的软局域玻璃态模式。研究了三维过冷液体模型中低频模的局域化特性。态密度$D(ω)$的计算考虑到固有的结构,以及热化在母体温度接近动态转变$T_\text d$的配置。我们观察到一个交叉的概率分布的参与率的倒数,发生接近$T_\text d$从高温。我们发现,一个类似的交叉观察到在高亲本温度时,系统的平移不变性被明确打破了随机钉扎场。

英文摘要:

Besides the dynamical slowing down signaled by an enormous increase of the viscosity approaching the glass transition, structural glasses show interesting anomalous thermodynamic features at low temperatures that hint at peculiar deviations from Debye's law at low enough frequencies. Theory, numerical simulations, and experiments suggest that deviation from Debye's law is due to soft-localized glassy modes that populate the low-frequency spectrum. We study the localization properties of the low-frequency modes in a three-dimensional supercooled liquid model. The density of states $D(ω)$ is computed considering the inherent structures of configurations well thermalized at parental temperatures close to the dynamical transition $T_\text d$. We observe a crossover in the probability distribution of the inverse of the participation ratio that happens approaching $T_\text d$ from high temperatures. We show that a similar crossover is observed at high parental temperature when the translational invariance of the system is explicitly broken by a random pinning field.

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