Negative differential mobility of weakly driven particles in models of glass formers.

摘要: We study the response of probe particles to weak constant driving in kinetically constrained models glassy systems, and show that probe's can be nonmonotonic give rise negative differential mobility: increasing applied force reduce drift velocity direction. Other significant nonlinear effects are also demonstrated, such as enhancement with fluctuations away from average path, a phenomenon known other contexts giant diffusivity. these results explained analytically by continuous-time random walk approximation where there is decoupling between persistence exchange times for local displacements probe. This due dynamic heterogeneity system, which leads bimodal distributions particle displacements. discuss relevance our experiments.