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arXiv 1702.00149cond-mat.stat-mech
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粒子间有限程相互作用系统中无抽运定理的有效性

The validity of the no-pumping theorem in systems with finite-range interactions between particles

Saar Rahav

摘要:

无泵定理指出,随机机器看似自然的驱动周期无法产生定向运动。无泵定理最初是从单粒子系统中推导出来的,最近被扩展到具有零程相互作用的多粒子系统。有趣的是,已知具有排斥相互作用的系统违反该定理。这两个范例的相互作用不同的两个定性方面:相互作用的范围,和系统的状态上的分支分数的依赖性。在这项工作中,两个不同的模型进行了研究,以确定定性的相互作用,导致故障的无泵。一个有限范围的相互作用的模型,分析,以满足无泵浦。相反,一个模型中的相互作用影响到达不同的网站的概率,给定的粒子正在进行过渡,数值显示违反无泵定理。结果表明,系统的相互作用,导致状态依赖的分支分数不满足无泵定理。

英文摘要:

The no-pumping theorem states that seemingly natural driving cycles of stochastic machines fail to generate directed motion. Initially derived for single particle systems, the no-pumping theorem was recently extended to many-particle systems with zero-range interactions. Interestingly, it is known that the theorem is violated by systems with exclusion interactions. These two paradigmatic interactions differ by two qualitative aspects: the range of interactions, and the dependence of branching fractions on the state of the system. In this work two different models are studied in order to identify the qualitative property of the interaction that leads to breakdown of no-pumping. A model with finite-range interaction is shown analytically to satisfy no-pumping. In contrast, a model in which the interaction affects the probabilities of reaching different sites, given that a particle is making a transition, is shown numerically to violate the no-pumping theorem. The results suggest that systems with interactions that lead to state-dependent branching fractions do not satisfy the no-pumping theorem.

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