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arXiv 1502.05210cond-mat.stat-mech
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二维布朗旋转棘轮系统的性能估计

Performance Estimation for Two-Dimensional Brownian Rotary Ratchet Systems

Hiroki Tutu, Takehiko Horita, Katsuya Ouchi

摘要:

在布朗棘轮模型的背景下,研究了一个分子旋转系统,该系统可以执行由线性极化交流场诱导的单向旋转,并在负载下产生正功。该模型是基于朗之万方程的粒子在一个二维(2D)的三重对称的三齿棘轮势。系统的性能由矫顽转矩表征,即,与由AC驱动场引起的转矩竞争的负载的强度,以及从驱动场到转矩的力转换中的能量效率。我们提出了一个主方程的粗粒度的状态,它考虑到状态之间的边界运动,并开发一个动力学描述估计平均角动量(MAM)和相关的能量平衡方程的权力。分析框架结合了几个二维特征,并适用于广泛的一类模型的光滑的二维棘轮电位。我们确认,所获得的表达式MAM,功率和效率的模型可以预测定性行为。我们还讨论了有用的扭矩/功率关系的实验分析,并提出了一个特点的2D棘轮系统。

英文摘要:

Within the context of the Brownian ratchet model, a molecular rotary system was studied that can perform unidirectional rotations induced by linearly polarized ac fields, and produce positive work under loads. The model is based on the Langevin equation for a particle in a two-dimensional (2D) three-tooth ratchet potential of threefold symmetry. The performance of the system is characterized by the coercive torque, i.e., the strength of the load competing with the torque induced by the ac driving field, and the energy efficiency in force conversion from the driving field to torque. We propose a master equation for coarse-grained states, which takes into account boundary motion between states, and develop a kinetic description to estimate mean angular momentum (MAM) and powers relevant to the energy balance equation. The framework of analysis incorporates several 2D characteristics, and is applicable to a wide class of models of smooth 2D ratchet potential. We confirm that the obtained expressions for MAM, power, and efficiency of the model can predict qualitative behaviors. We also discuss the usefulness of the torque/power relationship for experimental analyses, and propose a characteristic for 2D ratchet systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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