标题： 简单玻璃形成体中$α$和$β$过程的统一渗流情景 显示英文标题

标题： Unified percolation scenario for the $α$ and $β$ processes in simple glass formers

摘要： 鉴于相互作用细节的极大差异，在统一的理论框架中描述结构无序材料的动力学对凝聚态物理和材料科学提出了根本性的挑战。 本文数值研究了过冷液体和玻璃中两种最重要的弛豫过程的渗流情景。 对于九种二元玻璃形成体，我们发现，当温度从液态降低时，不可移动粒子的渗流发生在定位$\alpha$过程的温度处。 与此类似，继续冷却进入玻璃态时，移动粒子的渗流在 Johari-Goldstein$\beta$弛豫发生时被确定，只要它与$\alpha$过程明显分离。 在相同条件下，二维系统中移动和不可移动粒子的渗流几乎同时发生，无法识别$\beta$弛豫。 我们的发现表明，基于渗流视角可以对玻璃动力学进行一般性描述。 显示英文摘要

摘要： Given the vast differences in interaction details, describing the dynamics of structurally disordered materials in a unified theoretical framework presents a fundamental challenge to condensed-matter physics and materials science. This paper investigates numerically a percolation scenario for the two most important relaxation processes of supercooled liquids and glasses. For nine binary glass formers we find that, as temperature is lowered from the liquid state, percolation of immobile particles takes place at the temperature locating the $\alpha$ process. Mirroring this, upon continued cooling into the glass, mobile-particle percolation pinpoints a Johari-Goldstein $\beta$ relaxation whenever it is well separated from the $\alpha$ process. For 2D systems under the same conditions, percolation of mobile and immobile particles occurs nearly simultaneously and no $\beta$ relaxation can be identified. Our findings suggest a general description of glassy dynamics based on a percolation perspective.