Institut für Physik, Johannes Gutenberg-Universität Mainz, Mainz, Germany.
Phys Rev Lett. 2012 Jan 13;108(2):028303. doi: 10.1103/PhysRevLett.108.028303. Epub 2012 Jan 11.
A molecular dynamics computer simulation of a glass-forming Yukawa mixture is used to study the anisotropic dynamics of a single particle pulled by a constant force. Beyond linear response, a scaling regime is found where a force-temperature superposition principle of a Peclet number holds. In the latter regime, the diffusion dynamics perpendicular to the force can be mapped on the equilibrium dynamics in terms of an effective temperature, whereas parallel to the force a superdiffusive behavior is seen in the long-time limit. This behavior is associated with a hopping motion from cage to cage and can be qualitatively understood by a simple trap model.
使用玻璃化 Yukawa 混合物的分子动力学计算机模拟来研究单个粒子在恒定力作用下的各向异性动力学。超出线性响应范围，发现存在一个标度区域，其中存在一个 Peclet 数的力-温度叠加原理。在后一区域中，垂直于力的扩散动力学可以根据有效温度映射到平衡动力学，而在力的平行方向上，在长时间极限下会出现超扩散行为。这种行为与从笼到笼的跳跃运动有关，可以通过一个简单的陷阱模型定性理解。
