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arXiv 0806.3846cond-mat.stat-mech
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含时周期势中的聚合物动力学

Polymer dynamics in time-dependent periodic potentials

Janne Kauttonen, Juha Merikoski, Otto Pulkkinen

摘要:

用主方程方法研究了含时外势作用下离散高分子的动力学行为。我们考虑了势态的随机和确定性开关机制,给出了计算晶格上含时周期势中具有内部结构的分子定态性质的基本方程。作为例子,我们考虑了标准和改进的Rubinstein-Duke聚合物,计算了它们在两态非对称闪光势和对称行波势下的平均漂移和有效扩散系数。通过改变聚合物的长度,我们发现了由反弹效应引起的电流反转,这种现象只存在于具有内部结构的分子中。这些结果强烈依赖于聚合物类型。我们还注意到较长聚合物的传输相干性增加。

英文摘要:

Dynamics of a discrete polymer in time-dependent external potentials is studied with the master equation approach. We consider both stochastic and deterministic switching mechanisms for the potential states and give the essential equations for computing the stationary state properties of molecules with internal structure in time-dependent periodic potentials on a lattice. As an example, we consider standard and modified Rubinstein-Duke polymers and calculate their mean drift and effective diffusion coefficient in the two-state non-symmetric flashing potential and symmetric traveling potential. Rich non-linear behavior of these observables is found. By varying the polymer length, we find current inversions caused by the rebound effect that is only present for molecules with internal structure. These results depend strongly on the polymer type. We also notice increased transport coherence for longer polymers.

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