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arXiv 1608.05960cond-mat.stat-mech
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玻璃可压缩粒子晶格模型中的涌现易化行为

Emergent facilitation behavior in a distinguishable-particle lattice model of glass

Ling-Han Zhang, Chi-Hang Lam

摘要:

我们提出了结构玻璃的相互作用格子气模型,其特征是颗粒可区分性和与位置相关的随机最近邻颗粒相互作用。这包括在配置空间而不是在物理空间中淬灭的无序。该模型表现出非平凡的能量,同时仍然承认精确的平衡态直接构建在任意温度和密度。动力学定义为激活跳跃以下标准的动力学蒙特卡罗方法没有明确的促进规则。动力学模拟显示紧急动态便利化行为在玻璃相,其中个别空隙的运动是显着的,只有当附近的其他空隙加速。这为结构玻璃的动态易化图像提供了微观上的合理性。

英文摘要:

We propose an interacting lattice gas model of structural glass characterized by particle distinguishability and site-particle-dependent random nearest-neighboring particle interactions. This incorporates disorder quenched in the configuration space rather than in the physical space. The model exhibits non-trivial energetics while still admitting exact equilibrium states directly constructible at arbitrary temperature and density. The dynamics is defined by activated hopping following standard kinetic Monte Carlo approach without explicit facilitation rule. Kinetic simulations show emergent dynamic facilitation behaviors in the glassy phase in which motions of individual voids are significant only when accelerated by other voids nearby. This provides a microscopic justification for the dynamic facilitation picture of structural glass.

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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