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Current and efficiency optimization under oscillating forces in entropic barriers

Chinese Physics B 2016年第9期25卷 227-234页

作者： Ferhat Nutku Ekrem Aydiner Theoretical Physics Research Group Department of PhysicsFaculty of ScienceIstanbul University

The transport of externally overdriven particles confined in entropic barriers is investigated under various types of oscillating and temporal forces.Temperature,load,and amplitude dependence of the particle current and energy conversion efficiency are investigated in three dimensions.For oscillating forces,the optimized temperature–load,amplitude–temperature,and amplitude–load intervals are determined when fixing the amplitude,load,and temperature,respectively.By using three-dimensional plots rather than two-dimensional ones,it is clearly shown that oscillating forces provide more efficiency compared with a temporal one in specified optimized parameter regions.Furthermore,the dependency of efficiency to the angle between the unbiased driving force and a constant force is investigated and an asymmetric angular dependence is found for all types of forces.Finally,it is shown that oscillating forces with a high amplitude and under a moderate load lead to higher efficiencies than a temporal force at both low and high temperatures for the entire range of contact angle.

关键词： entropic barrier brownian motion Fick–Jacobs equation efficiency of brownian motor

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Current and efficiency of brownian particles under oscillating forces in entropic barriers

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Chinese Physics B 2015年第4期24卷 82-89页

作者： Ferhat Nutku Ekrem Aydιner Theoretical Physics Research Group Department of Physics Faculty of Sciencestanbul University

In this study, considering the temporarily unbiased force and different forms of oscillating forces, we investigate the current and efficiency of brownian particles in an entropic tube structure and present the numerically obtained results. We show that different force forms give rise to different current and efficiency profiles in different optimized parameter intervals. We find that an unbiased oscillating force and an unbiased temporal force lead to the current and efficiency, which are dependent on these parameters. We also observe that the current and efficiency caused by temporal and different oscillating forces have maximum and minimum values in different parameter intervals. We conclude that the current or efficiency can be controlled dynamically by adjusting the parameters of entropic barriers and applied force.

关键词： entropic barrier brownian motion Fick-Jacobs equation efficiency of brownian motor stochastic processes

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