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通过将轮变形方法与W的分析延续相结合,加速核心级GW计算
Ramón L Panadés-Barrueta1, Dorothea Golze1
1Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden 01062, Germany.
Journal of chemical theory and computation
|August 11, 2023
概括
核心级GW计算的轮变形 (CD) 方法通过CD-WAC技术得到了改进,减少了从O(N^5) 到O(N^4) 的计算缩放. 这提高了复杂系统的效率,同时保持了高精度.
科学领域:
- 计算物理和化学 计算物理和化学
- 量子力学方法 量子力学方法
- 材料科学是一种材料科学.
背景情况:
- 在准确的核心级绑定能量的计算中,GW方法至关重要.
- 轮变形 (CD) 为GW在深核激发中的自我能量提供了一种高效的方法.
- 目前的CD方法面临高计算扩展 (O(N^5)) 核心级计算.
研究的目的:
- 开发一个更高效的计算GW方法,用于核心级结合能.
- 为了减少轮变形 (CD) 技术的缩放,用于核心级计算.
- 为了保持CD的数值准确性,用于深核激发.
主要方法:
- 介绍了CD-WAC (带W分析延续的CD) 方法.
- 选库伦相互作用 (W) 的分析延续 (AC) 以减少缩放.
- 在基准数据集 (例如,CORE65) 和大型系统 (乙烯链,无形碳) 上实施和测试.
主要成果:
- 减少了CD的计算缩放,用于核心级GW计算,从O(N^5) 到O(N^4).
- 保持了高的数值准确性,单次GW计算的平均绝对误差<5 meV.
- 在大型系统上实现了高达10倍的加速度,证实了理论扩展.
结论:
- CD-WAC方法显著提高了核心级GW计算的计算效率.
- 这一进步使得对更大,更复杂的系统能够进行准确和高效的研究.
- CD-WAC是一种可靠且可扩展的方法,用于深核级GW计算.
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