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An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
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改进了相关性,优化了虚拟轨道算法,用于平面波全配置交互计算.

Mingyu Qiu1, Zhenlin Zhang1, Zhiyuan Zhang1

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科学领域:

  • 计算化学的计算化学
  • 量子力学就是量子力学.
  • 材料科学 材料科学 材料科学

背景情况:

  • 全配置相互作用 (FCI) 计算对于准确描述电子相关性至关重要,但在周期系统中面临挑战.
  • 平面波基集对于周期系统是有效的,但对于直接的FCI应用来说太大了.
  • 像DFT这样的现有方法与强烈相关的系统作斗争.

研究的目的:

  • 开发一种使用平面波基集对周期系统进行FCI计算的方法.
  • 为了克服FCI中大型平面波基集的计算局限性.
  • 准确地建模周期性材料中的强相关电子.

主要方法:

  • 开发了一个改进的相关性优化虚拟轨道 (COVOS) 框架.
  • 旋转矩阵增强了活动空间,代合过程优化了轨道.
  • 该方法压缩大平面波基设置为可管理的FCI虚拟轨道.

主要成果:

  • 改进的COVOS框架成功地压缩了FCI计算的平面波基础集.
  • 应用于超级电池计算和金属系统的潜在能量曲线.
  • 与原来的COVOS算法和其他方法相比,证明了优越的融合和相关性描述.

结论:

  • 开发的算法可以使用周期系统的平面波基集进行准确的FCI计算.
  • 它解决了DFT的局限性,并为金属系统提供了比MP2或RPA更可靠的对应能量的描述.
  • 强调了在材料模拟中使用平面波基集实现FCI的重要性.