Structural characteristics of strongly coupled ions in a dense quantum plasma.
Structural characteristics of strongly coupled ions in a dense quantum plasma.
复制标题
DOI：
10.1103/physreve.98.023207
复制
发表时间：
2018-04
期刊：
影响因子：
--
通讯作者：
Z. Moldabekov;S. Groth;T. Dornheim;H. Kählert;M. Bonitz;T. Ramazanov
中科院分区：
文献类型：
--
作者：
Z. Moldabekov;S. Groth;T. Dornheim;H. Kählert;M. Bonitz;T. Ramazanov
在离子通过屏蔽对相互作用势相互作用的单组分等离子体模型的框架下，研究了具有中度至强简并电子的致密等离子体中强耦合离子的结构特性。特别关注 Singwi-Tosi-Land-Sjölander (STLS) 近似中电子筛选的描述。使用从基态量子蒙特卡罗数据获得的离子势、随机相位近似（RPA）和现有分析模型进行不同的交叉检查和分析，用于计算强耦合离子的结构特性，例如对分布和静态结构因子。结果对筛选的配对相互作用潜力的特征高度敏感。这种影响在静态结构因素中尤其明显。根据 STLS 计算的屏蔽电势的适用范围根据电子的密度和温度来确定。结果表明，当 r_{s}>1（其中 r_{s} 是平均电子间距离与玻尔半径之比）时，超过 RPA 的电子相关性对结构性能具有不可忽略的影响。此外，还采用有效耦合参数方法分析了超网络链近似对于使用筛选对相互作用势计算结构特性的适用性。
The structural properties of strongly coupled ions in dense plasmas with moderately to strongly degenerate electrons are investigated in the framework of the one-component plasma model of ions interacting through a screened pair interaction potential. Special focus is put on the description of the electronic screening in the Singwi-Tosi-Land-Sjölander (STLS) approximation. Different cross-checks and analyses using ion potentials obtained from ground-state quantum Monte Carlo data, the random phase approximation (RPA), and existing analytical models are presented for the computation of the structural properties, such as the pair distribution and the static structure factor, of strongly coupled ions. The results are highly sensitive to the features of the screened pair interaction potential. This effect is particularly visible in the static structure factor. The applicability range of the screened potential computed from STLS is identified in terms of density and temperature of the electrons. It is demonstrated that at r_{s}>1, where r_{s} is the ratio of the mean interelectronic distance to the Bohr radius, electronic correlations beyond RPA have a nonnegligible effect on the structural properties. Additionally, the applicability of the hypernetted chain approximation for the calculation of the structural properties using the screened pair interaction potential is analyzed employing the effective coupling parameter approach.