论文标题
玻璃杯中的障碍物和熵驱动激活之间的竞争
Competition between Barrier- and Entropy-Driven Activation in Glasses
论文作者
论文摘要
在简化的眼镜模型中，我们阐明了存在两种不同类型的活化动力学的存在，它们共存，两者中的一个占主导地位。一个是通常用于描绘激活的能源屏障跳动，另一个我们称之为熵激活的跳动是由方便方向的稀缺驱动的。当熵激活占主导地位时，能量屏障的高度不再是描述系统放缓的决定性。在我们的分析中，一种机制在另一个机制上的优势取决于状态和温度的密度的形状。我们还发现，在低温下，可能发生两种激活之间的相变。我们的框架可用于协调眼镜放缓的促进和热力学图片。
In simplified models of glasses we clarify the existence of two different kinds of activated dynamics, which coexist, with one of the two dominating over the other. One is the energy barrier hopping that is typically used to picture activation, and the other one, which we call entropic activation, is driven by the scarcity of convenient directions. When entropic activation dominates, the height of the energy barriers is no longer the decisive to describe the system's slowdown. In our analysis, dominance of one mechanism over the other depends on the shape of the density of states and temperature. We also find that at low temperatures a phase transition between the two kinds of activation can occur. Our framework can be used to harmonize the facilitation and thermodynamic pictures of the slowdown of glasses.
