计算物理 ›› 2014, Vol. 31 ›› Issue (1): 121-126.

• 论文 • 上一篇    

一种周期库仑作用势优化法的改进

李名锐1,2, 周刚2, 初哲2, 马坤2, 钱秉文1,2   

  1. 1. 清华大学工程物理系, 北京 100084;
    2. 西北核技术研究所, 西安 710024
  • 收稿日期:2013-03-10 修回日期:2013-06-24 出版日期:2014-01-25 发布日期:2014-01-25
  • 作者简介:李名锐(1983-),男,博士生,从事稠密液氢分子模拟研究,E-mail:limmi_nint@163.com
  • 基金资助:
    国家部委基金(D413011301)资助项目

An Improved Optimized Method for Periodic Coulomb Potential

LI Mingrui1,2, ZHOU Gang2, CHU Zhe2, MA Kun2, QIAN Bingwen1,2   

  1. 1. Department of Engineering Physics, Tsiughua University, Beijing 100084, China;
    2. Northwest Institute of Nuclear Technology, Xi'an 710024, China
  • Received:2013-03-10 Revised:2013-06-24 Online:2014-01-25 Published:2014-01-25

摘要: 利用简单多项式基组拟合变化平缓的长程作用部分,并增加多个限定条件以提高优化势与库仑势的局部重合度,对Natoli优化法进行改进.在不增加计算复杂度的前提下,得到平均偏差明显降低的优化势;建议优化时划分r空间与k空间的准则取kcrc ≥ 15.在稠密液氢分子模拟中,优化法获得的能量及压力均小于Natoli法与Ewald法的结果.

关键词: 长程作用, 优化法, 库仑势, Ewald求和, 多体

Abstract: Optimization method for Coulomb potential by Natoli was improved,in which simple polynomial basis functions are used to fit slowly varying long-rang part of potential,and limited conditions are set to enhance consistency.Without increasing computational complexities,an optimal potential with lower mean squared difference is obtained.Cutoff criterion in real and reciprocal space determining optimal breakup of exact potential is suggested kcrc ≥ 15.New potential was tested on dense liquid hydrogen which shows lower pressure and energy than Natoli and Ewald potentials.

Key words: long-range interaction, optimized method, Coulomb potential, Ewald summation, N-body

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