中国物理B ›› 2004, Vol. 13 ›› Issue (5): 778-782.doi: 10.1088/1009-1963/13/5/035
• 8000 CROSSDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇 下一篇
陈江星, 冯春木, 汪友梅, 曹义刚, 焦正宽
Chen Jiang-Xing (陈江星), Feng Chun-Mu (冯春木), Wang You-Mei (汪友梅), Cao Yi-Gang (曹义刚), Jiao Zheng-Kuan (焦正宽)
摘要: Using Langevin simulations, we have investigated numerically the depinning dynamics of driven two-dimensional colloids subject to the randomly distributed point-like pinning centres. With increasing strength of pinning, we find a crossover from elastic to plastic depinnings, accompanied by an order to disorder transition of state and a substantial increase in the depinning force. In the elastic regime, no peaks are found in the differential curves of the velocity-force dependence (VFD) and the transverse motion is almost none. In addition, the scaling relationship between velocity and force is found to be valid above depinning. However, when one enters the plastic regime, a peak appears in the differential curves of VFD and transverse diffusion occurs above depinning. Furthermore, history dependence is found in the plastic regime.
中图分类号: (Colloids)