在平面波电子结构计算中的库伦奇点校正:实现和基准测试
Yexuan Lin1, Sheng Chen1, Linhao Wang1
1Hefei National Research Center for Physical Sciences at the Microscale, and Hefei National Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China.
研究人员开发了用于定期系统的电子结构计算中固定奇点的方法. 这提高了RPA和GW近似等先进计算技术的准确性和效率.
科学领域:
- 计算物理 计算物理
- 量子化学 是一个量子化学.
- 材料科学 材料科学 材料科学
背景情况:
- 科恩-沙姆密度函数理论 (DFT) 对于电子结构计算至关重要.
- 将DFT与波函数方法相结合,会在周期系统中引入奇点.
- 这些奇点源于远程库伦潜力,影响准确性和效率.
研究的目的:
- 在周期系的平面波计算中解决和解决1/r奇点问题.
- 提高混合函数,RPA,GW和TDDFT等计算方法的准确性和效率.
- 率先实施和研究维格纳-西茨截断用于基于平面波的RPA和GW计算.
主要方法:
- 各种奇点处理方法的比较:球形切断,维格纳-西茨切断,选的库伦电位,辅助函数和探测电荷方法.
- 在基于平面波的RPA和GW计算中实施和系统地调查Wigner-Seitz截断方案.
- 使用超级细胞扩张和k点采样来分析收度和精度.
主要成果:
- 证明了Wigner-Seitz截断在缓解RPA和GW计算的奇点方面的有效性.
- 提供了对不同切断方案的收性质和精度的系统分析.
- 确定了各种系统和计算方法的最佳校正策略.
结论:
- 维格纳-西茨切断方案是处理周期平面波计算中的奇点的可行和有效方法.
- 该研究为选择适当的奇点校正策略提供了有价值的指导.
- 这些发现为在凝聚物质物理学和量子化学中进行更准确,更有效的电子结构计算铺平了道路.
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