Turci Francesco, Speck Thomas, Royall C Patrick
H.H. Wills Physics Laboratory, University of Bristol, BS8 1TL, Bristol, UK.
Centre for Nanoscience and Quantum Information, BS8 1FD, Bristol, UK.
Eur Phys J E Soft Matter. 2018 Apr 26;41(4):54. doi: 10.1140/epje/i2018-11662-3.
In trajectory space, dynamical heterogeneities in glass-forming liquids correspond to the emergence of a dynamical phase transition between an active phase poor in local structure and an inactive phase which is rich in local structure. We support this scenario with the study of a model additive mixture of Lennard-Jones particles, quantifying how the choice of the relevant structural and dynamical observable affects the transition in trajectory space. We find that the low mobility, structure-rich phase is dominated by icosahedral order. Applying a non-equilibrium rheological protocol, we connect local order to the emergence of mechanical rigidity.
在轨迹空间中，玻璃形成液体中的动力学非均匀性对应于局部结构贫乏的活性相和局部结构丰富的非活性相之间动力学相变的出现。我们通过对 Lennard-Jones 粒子的模型添加剂混合物的研究来支持这一设想，量化相关结构和动力学可观测量的选择如何影响轨迹空间中的转变。我们发现，低迁移率、结构丰富的相由二十面体序主导。应用非平衡流变学方案，我们将局部有序与机械刚性的出现联系起来。
