中国物理B ›› 2002, Vol. 11 ›› Issue (6): 624-628.doi: 10.1088/1009-1963/11/6/320

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Transport properties under the influence of finite friction

展永, 赵同军, 于慧, 宋艳丽   

  1. School of Science and Arts, Hebei University of Technology, Tianjin 300130, China
  • 收稿日期:2001-01-03 修回日期:2002-03-05 出版日期:2005-06-12 发布日期:2005-06-12
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10075007), by the Natural Science Foundation of Hebei Province, China (Grant No 102001) and by the Doctoral Fund of Hebei Province, China (Grant Nos B2001128 and 0054701D).

Transport properties under the influence of finite friction

Zhan Yong (展永), Zhao Tong-Jun (赵同军), Yu Hui (于慧), Song Yan-Li (宋艳丽)   

  1. School of Science and Arts, Hebei University of Technology, Tianjin 300130, China
  • Received:2001-01-03 Revised:2002-03-05 Online:2005-06-12 Published:2005-06-12
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10075007), by the Natural Science Foundation of Hebei Province, China (Grant No 102001) and by the Doctoral Fund of Hebei Province, China (Grant Nos B2001128 and 0054701D).

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摘要： Using the Langevin Monte Carlo method, the influence of friction on the directed motion of a Brownian particle driven by an external noise source is investigated. The results show that the existence and change of the environment friction influence the establishment and development of the steady motion of a Brownian particle derived by non-equilibrium fluctuation. The most probable correlation time, which corresponds to the maximum current, is inversely proportional to the friction coefficient. The abnormal transition of the current with different friction appears because of the coupling between the effective ratchet potential and coloured noise intensity.

Abstract: Using the Langevin Monte Carlo method, the influence of friction on the directed motion of a Brownian particle driven by an external noise source is investigated. The results show that the existence and change of the environment friction influence the establishment and development of the steady motion of a Brownian particle derived by non-equilibrium fluctuation. The most probable correlation time, which corresponds to the maximum current, is inversely proportional to the friction coefficient. The abnormal transition of the current with different friction appears because of the coupling between the effective ratchet potential and coloured noise intensity.

Key words: Langevin Monte Carlo, finite friction, stationary current

中图分类号:  (Brownian motion)

  • 05.40.Jc
05.40.Ca (Noise) 02.50.Ng (Distribution theory and Monte Carlo studies) 02.50.Cw (Probability theory) 46.55.+d (Tribology and mechanical contacts)