Abstract
A nonequilibrium potential function is introduced for a motor protein modeled by a rectified Brownian motion. This result provides a concrete case for a class of nonequilibrium systems in steady state with dissipation which possess a potential function. The potential μ is a natural generalization of the chemical potential for isothermal chemical species and μ=const if and only if the system is in an equilibrium. The steady-state flux J∝-∇μ, and the total heat dissipation equals a surface integral representing the energy input. In terms of μ and the thermodynamic energy conservation in the mesoscopic stochastic system can be rigorously established and various types of motor efficiency are elucidated.
- Received 6 December 2002
DOI:https://doi.org/10.1103/PhysRevE.69.012901
©2004 American Physical Society