在数值原子中心轨道框架中对相关方法的同一性方法的可分离分辨率的准确性进行基准测试
Francisco A Delesma1, Moritz Leucke2, Dorothea Golze2
1Department of Applied Physics, Aalto University, FI-02150 Espoo, Finland.
The Journal of chemical physics
|January 11, 2024
概括
一个新的可分离的身份解决方案 (RI) 准确计算电子结构积分. 这种方法可以降低诸如随机相近似 (RPA) 和GW计算等方法的计算成本.
科学领域:
- 计算化学计算化学
- 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:
- 四中心两电子库伦积分在电子结构计算中至关重要.
- 辨别身份 (RI) 技术减少了这些积分的计算费用.
- 可分离的RI方案提供了与全球RI方法相比的准确性.
研究的目的:
- 在一个全电子数值原子中心轨道框架中实现可分离的RI方案.
- 对可分离RI方案的准确性和效率进行基准测试.
- 评估各种电子结构方法和系统大小的性能.
主要方法:
- 实施可分离的RI计划.
- 利用一个全电子数值原子中心的轨道框架.
- 与Thiel和GW100测试套件进行基准测试,包括Hartree-Fock,MP2,CCSD,RPA和GW.
主要成果:
- 可分离RI方法实现了高精度,在9 meV内复制无RI的Hartree-Fock,在1 meV内复制MP2.
- 发现错误是独立于系统大小的,验证了多达116个原子的无序碳集群.
- 启用立方缩放配方用于随机相近似 (RPA) 和GW计算.
结论:
- 实施的可分离RI方案对于电子结构计算是准确和高效的.
- 这种方法为大型系统提供了可扩展的方法.
- 它可以使用先进的量子化学方法进行准确和经济高效的计算.
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