arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.1037cond-mat.stat-mechcond-mat.soft
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带电表面间一维对流气体:与弱耦合和强耦合分析比较的精确结果

One-dimensional counterion gas between charged surfaces: Exact results compared with weak- and strong-coupling analysis

David S. Dean, Ron R. Horgan, Ali Naji, Rudolf Podgornik

摘要:

我们评估准确的统计积分的非均匀一维计数器之间的两个带电边界的库仑气体,并从这个计算的有效相互作用,或分离压力,边界表面之间。我们的精确结果进行了比较,弱耦合和强耦合的极限情况下,这是相同的一维和三维系统。对于大量的抗衡离子的系统,它被发现,弱耦合(平均场)近似的分离压力完美的作品,在1D中的平均场周围的波动比在3D中小得多。在反离子较少的情况下,强耦合近似由于适当地考虑了反离子电荷的离散性而表现得更好。

英文摘要:

We evaluate exactly the statistical integral for an inhomogeneous one-dimensional counterion-only Coulomb gas between two charged boundaries and from this compute the effective interaction, or disjoining pressure, between the bounding surfaces. Our exact results are compared with the limiting cases of weak and strong coupling which are the same for 1D and 3D systems. For systems with a large number of counterions it is found that the weak coupling (mean-field) approximation for the disjoining pressure works perfectly and that fluctuations around the mean-field in 1D are much smaller than in 3D. In the case of few counterions it works less well and strong coupling approximation performs much better as it takes into account properly the discreteness of the counterion charges.

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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