| Particle Transport with Asymmetric Unbiased Forces and Entropic Barrier |
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| 作者姓名： | 谢汇章 艾保全 刘雪梅 程晓波 刘良钢 李志兵 |
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| 作者单位： | [1]Department of Physics, Zhongshan University, Guangzhou 510275 [2]School of Physics, South China University of Technology, Guangzhou 510641 [3]School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510631 [4]Faculty of Information Technology, Macau University of Science and Technology, Macau |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant Nos 90103028, 90306016, and 10674182, and the Natural Science Foundation of South China University of Technology under Grant No B14-E5050200. |
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| 摘 要： | Transport of a Brownian particle moving along the axis of a three-dimensional （313） symmetric and periodic tube is investigated in the presence of asymmetric unbiased forces. It is found that in the presence of entropic barrier, the asymmetry of the unbiased forces is a way of inducing a net particle current. The particle current is a peaked function of temperature, which indicates that the thermal noise may facilitate the transport even in the presence of entropic barrier. There exists an optimized radius at the bottleneck at which the particle current takes its maximum value. The current can be influenced by the slope of tube walls and there exists an optimized slope for which the particle current takes its maximum value.
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| 关 键 词： | 粒子传输 对称性 强制力 屏障 |
| 收稿时间： | 2007-03-30 |
Particle Transport with Asymmetric Unbiased Forces and Entropic Barrier |
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| XIE Hui-Zhang,AI Bao-Quan,LIU Xue-Mei CHENG Xiao-Bo,LIU Liang-Gang,LI Zhi-Bing.Particle Transport with Asymmetric Unbiased Forces and Entropic Barrier[J].Chinese Physics Letters,2007,24(12):3340-3343. |
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| Authors: | XIE Hui-Zhang AI Bao-Quan LIU Xue-Mei CHENG Xiao-Bo LIU Liang-Gang LI Zhi-Bing |
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| Institution: | Department of Physics, Zhongshan University, Guangzhou 510275School of Physics, South China University of Technology, Guangzhou 510641School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510631Faculty of Information Technology, Macau University of Science and Technology, Macau |
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| Abstract: | Transport of a Brownian particle moving along the axis of a three-dimensional (3D) symmetric and periodic tube is investigated in the presence of asymmetric unbiased forces. It is found that in the presence of entropic barrier, the asymmetry of the unbiased forces is a way of inducing a net particle current. The particle current is a peaked function of temperature,which indicates that the thermal noise may facilitate the transport even in the presence of entropic barrier. There exists an optimized radius at the bottleneck at which the particle current takes its maximum value. The current can be influenced by the slope of tube walls and there exists an optimized slope for which the particle current takes its maximum value. |
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| Keywords: | 05 40 Ca 05 40 Jc 87 10 +e |
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