中国物理B ›› 2013, Vol. 22 ›› Issue (7): 74706-074706.doi: 10.1088/1674-1056/22/7/074706

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Diffusion dynamics in external noise-activated non-equilibrium open system reservoir coupling environment

王春阳   

  1. College of Physics and Engineering, Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Qufu Normal University, Qufu 273165, China
  • 收稿日期:2012-09-22 修回日期:2013-01-22 出版日期:2013-06-01 发布日期:2013-06-01
  • 基金资助:
    Project supported by the Natural Science Foundation for Youths of Shandong Province, China (Grant No. ZR2011AQ016) and the Postdoctoral Innovation Program Foundation of Shandong Province, China (Grant No. 201002015).

Diffusion dynamics in external noise-activated non-equilibrium open system reservoir coupling environment

Wang Chun-Yang (王春阳)   

  1. College of Physics and Engineering, Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Qufu Normal University, Qufu 273165, China
  • Received:2012-09-22 Revised:2013-01-22 Online:2013-06-01 Published:2013-06-01
  • Contact: Wang Chun-Yang E-mail:wchy@mail.bnu.edu.cn
  • Supported by:
    Project supported by the Natural Science Foundation for Youths of Shandong Province, China (Grant No. ZR2011AQ016) and the Postdoctoral Innovation Program Foundation of Shandong Province, China (Grant No. 201002015).

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摘要： The diffusion process in an external noise-activated non-equilibrium open system-reservoir coupling environment is studied by analytically solving the generalized Langevin equation. The dynamical property of the system near the barrier top is investigated in detail by numerically calculating the quantities such as mean diffusion path, invariance, barrier passing probability, and so on. It is found that, comparing with the unfavorable effect of internal fluctuations, the external noise activation is sometimes beneficial to the diffusion process. An optimal strength of external activation or correlation time of the internal fluctuation is expected for the diffusing particle to have a maximal probability to escape from the potential well.

关键词: external noise, diffusion, non-equilibrium open environment

Abstract: The diffusion process in an external noise-activated non-equilibrium open system-reservoir coupling environment is studied by analytically solving the generalized Langevin equation. The dynamical property of the system near the barrier top is investigated in detail by numerically calculating the quantities such as mean diffusion path, invariance, barrier passing probability, and so on. It is found that, comparing with the unfavorable effect of internal fluctuations, the external noise activation is sometimes beneficial to the diffusion process. An optimal strength of external activation or correlation time of the internal fluctuation is expected for the diffusing particle to have a maximal probability to escape from the potential well.

Key words: external noise, diffusion, non-equilibrium open environment

中图分类号:  (Reactive and radiative flows)

  • 47.70.-n
82.20.Db (Transition state theory and statistical theories of rate constants) 82.60.-s (Chemical thermodynamics) 05.60.Cd (Classical transport)