Glass Transition of the Monodisperse Gaussian Core Model
Glass Transition of the Monodisperse Gaussian Core Model
复制标题
DOI：
10.1103/physrevlett.106.015701
复制
发表时间：
2011-01-04
影响因子：
8.6
通讯作者：
Miyazaki, Kunimasa
中科院分区：
文献类型：
--
作者：
Ikeda, Atsushi;Miyazaki, Kunimasa
我们对过冷状态下单分量高斯核心模型的动力学特性进行了数值研究。我们发现随着密度的增加，成核越来越受到抑制。该系统同时表现出玻璃状、缓慢的动力学特征，其特征是密度相关性的两步拉伸指数弛豫和弛豫时间的急剧增加。我们还发现，与典型的模型玻璃形成体相比，斯托克斯-爱因斯坦关系的违反更弱，非高斯参数更小，这意味着动态异质性更弱。此外，模拟数据与模态耦合理论的预测吻合得非常好，表明这种超软颗粒流体的慢动力学性质是类平均场的。这一事实可以被理解为相互作用的远程性质的结果。
We numerically investigate the dynamical properties of the one-component Gaussian core model in supercooled states. We find that nucleation is increasingly suppressed with increasing density. The system concomitantly exhibits glassy, slow dynamics characterized by the two-step stretched exponential relaxation of the density correlation and a drastic increase of the relaxation time. We also find a weaker violation of the Stokes-Einstein relation and a smaller non-Gaussian parameter than in typical model glass formers, implying weaker dynamic heterogeneities. Additionally, the agreement of the simulation data with the prediction of mode-coupling theory is exceptionally good, indicating that the nature of the slow dynamics of this ultrasoft particle fluid is mean-field-like. This fact may be understood as a consequence of the long-range nature of the interaction.