Diffusion Coefficients for Two-State Brownian Motors (General)
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概要
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Based on the Fokker-Planck equation, a formula for the effective diffusion coefficient D is derived for a Brownian particle undergoing one-dimensional motion in a two-state Brownian motor (ratchet) in which a spatially periodic, asymmetric potential acting on the particle switches between two states stochastically. It turns out that D is in close relation to the "mobility" μ defined as dv/dF where v is the average velocity of the particle and F is the external force acting on it. The formula is applied to specific examples, and it is found that inequality D ≥ μk_BT, with k_B the Boltzmann constant and T the temperature, holds in all the cases investigated. In the light of new results obtained here, an earlier analysis of a biological molecular motor KIF1A based on the "on-off" ratchet is re-examined.
- 社団法人日本物理学会の論文
- 2003-10-15
著者
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Sasaki Kazuo
Department Of Neuropsychiatry Fukui Medical University
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Sasaki K
Department Of Applied Physics Tohoku University
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Sasaki Kazuo
Department Of Applied Chemistry Faculty Of Engineering Hiroshima University
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