论文标题
二氧化硅眼镜中的通用低频振动模式
Universal low-frequency vibrational modes in silica glasses
论文作者
论文摘要
最近显示，具有二进制相互作用的玻璃形成器的不同简单模型根据其准定位的低频模式的状态密度定义了通用类别。明确地，一旦避免了与标准Debye（扩展）模式的杂交，许多此类模型表现出通用状态密度，具体取决于模式频率为$ d（ω）\ simω^4 $。尚不清楚，但是这个通用类别有多大，以及它是否与更现实的玻璃板模型有关。为了解决这个问题，我们介绍了二氧化硅中的准定位模式的分析，二元玻璃具有二元相互作用和三元相互作用。我们得出的结论是，在三维中，二氧化硅在低频下表现出相同的频率依赖性，这表明这种通用形式是无定形玻璃度的一般结果。
It was recently shown that different simple models of glass formers with binary interactions define a universality class in terms of the density of states of their quasi-localized low-frequency modes. Explicitly, once the hybridization with standard Debye (extended) modes is avoided, a number of such models exhibit a universal density of state, depending on the mode frequencies as $D(ω) \sim ω^4$. It is unknown however how wide is this universality class, and whether it also pertains to more realistic models of glass formers. To address this issue we present analysis of the quasi-localized modes in silica, a network glass which has both binary and ternary interactions. We conclude that in 3-dimensions silica exhibits the very same frequency dependence at low frequencies, suggesting that this universal form is a generic consequence of amorphous glassiness.
