Diffusion in periodic potentials

Diffusion in periodic potentials
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周期性势的扩散

DOI:
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发表时间:
1977
期刊:
影响因子:
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通讯作者:
W. Schneider
W. Schneider
中科院分区:
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文献类型:
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作者:
W. Dieterich;I. Peschel;W. Schneider

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我们讨论了周期势中与粒子布朗运动有关的静态和动态现象。具体来说,我们考虑了动力流动性和动力结构因素。我们用数值例子来说明平移运动和振荡运动是如何在这些量中表现出来的。计算是针对一维情况进行的。一个主要的工具是相关函数的连分式展开。例如,它使我们能够获得余弦势中迁移率的数值精确结果。该模型可能应用于超导导体和具有旋转扩散的分子晶体领域。
We discuss the static and dynamic phenomena connected with the Brownian motion of a particle in a periodic potential. Specifically we consider the dynamic mobility and the dynamic structure factor. We show with numerical examples how translational and oscillatory motion show up in these quantities. The calculations are done for the onedimensional case. A main tool is the continued fraction expansion of the relevant correlation functions. It enables us, for example, to obtain numerically accurate results for the mobility in a cosine potential. Possible applications of this model lie in the fields of superionic conductors and molecular crystals with rotational diffusion.