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| Depinning dynamics of driven colloids with random pinning： a numerical study | |
| 引用本文： | 陈江星,冯春木,汪友梅,曹义刚,焦正宽. Depinning dynamics of driven colloids with random pinning： a numerical study[J]. 中国物理, 2004, 13(5): 778-782. DOI: 10.1088/1009-1963/13/5/035 |
| 作者姓名： | 陈江星 冯春木 汪友梅 曹义刚 焦正宽 |
| 作者单位： | Department of Physics, Zhejiang University, Hangzhou 310027, China |
| 基金项目： | Project supported by the Ministry of Science and Technology of China (Grant No NKBRSF-G19990646), the Postdoctoral Science Foundation of China, and the Scientific Research Foundation of State Education Ministry for Returned Overseas Chinese Scholars. |
| 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. |
| 关 键 词： | 胶体 交叉 Langevin模拟 随机固定 高能物理学 |
| 收稿时间： | 2003-10-17 |
Depinning dynamics of driven colloids with random pinning: a numerical study |
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| Chen Jiang-Xing,Feng Chun-Mu,Wang You-Mei,Cao Yi-Gang and Jiao Zheng-Kuan. Depinning dynamics of driven colloids with random pinning: a numerical study[J]. Chinese Physics, 2004, 13(5): 778-782. DOI: 10.1088/1009-1963/13/5/035 | |
| Authors: | Chen Jiang-Xing Feng Chun-Mu Wang You-Mei Cao Yi-Gang Jiao Zheng-Kuan |
| Affiliation: | Department of Physics, Zhejiang University, Hangzhou 310027, China |
| Abstract: | 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. |
| Keywords: | colloid depinning crossover |
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