驱动系统的反常动力学响应
Anomalous Dynamical Responses in a Driven System
摘要：
在非平衡稳态中，结构和动力学之间的相互作用还远未被理解。我们解决这种相互作用，通过跟踪布朗动力学轨迹的粒子在一个二元胶体的相反的电荷在外部电场，经历交叉从均匀到车道状态，在非平衡系统中的异质结构形成的原型。我们发现，结构相关性的长度尺度控制扩散和随之而来的异常动态响应的异质性，如粒子位移和拉伸指数结构松弛的概率分布中的指数尾。我们概括了我们的观察使用方程的稳态密度，这可能有助于了解凝聚态系统中的非均匀扩散的微观基础。
英文摘要：
The interplay between structure and dynamics in non-equilibrium steady-state is far from understood. We address this interplay by tracking Brownian Dynamics trajectories of particles in a binary colloid of opposite charges in an external electric field, undergoing cross-over from homogeneous to lane state, a prototype of heterogeneous structure formation in non-equilibrium systems. We show that the length scale of structural correlations controls heterogeneity in diffusion and consequent anomalous dynamic responses, like the exponential tail in probability distributions of particle displacements and stretched exponential structural relaxation. We generalise our observations using equations for steady state density which may aid to understand microscopic basis of heterogeneous diffusion in condensed matter systems.
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