Ewald sums for Yukawa potentials

Ewald sums for Yukawa potentials
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Ewald 对 Yukawa 势求和

DOI:
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发表时间:
2000
期刊:
影响因子:
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通讯作者:
J. Caillol
J. Caillol
中科院分区:
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文献类型:
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作者:
G. Salin;J. Caillol

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涉及Yukawa相互作用y(r)=exp(−αr)/r的系统的数值模拟(例如,胶体,尘埃等离子体,.)在立方体模拟单元的边界上的电势不能被忽略的情况下需要一些谨慎[即,当y(L/2)-立方体的L侧-大于能量的热平均所需的绝对不确定性时]。在这种情况下,通常的最小图像公约失败,它是必要的,以介绍埃瓦尔德总和类似于那些用于库仑系统。在这项研究中,我们推导出的Ewald和Yukawa相互作用的表达式,并讨论其截断引起的数值误差。
The numerical simulation of systems involving Yukawa interaction y(r)=exp(−αr)/r (e.g., colloids, dusty plasmas,…) needs some caution in the case where the potential cannot be neglected on the boundaries of the cubic simulation cell [i.e., when y(L/2)−L side of the cube — is larger than the absolute uncertainties wanted for the thermal average of the energy]. In that case the usual minimum image convention fails and it is necessary to introduce Ewald sums similar to those used for Coulomb systems. In this study we derive the expression of the Ewald sums associated to Yukawa interactions and discuss the numerical errors induced by their truncation.