固体内固有的键轨道的收和属性
Benjamin Wöckinger1, Alexander Rumpf1, Tobias Schäfer1
1Institute for Theoretical Physics, TU Wien, Wiedner Hauptstraße 8-10/136, Vienna A-1040, Austria.
Journal of chemical theory and computation
|October 16, 2025
概括
我们开发了内在键轨道 (IBOs) 来研究固体中的局部Wannier轨道. 这些轨道揭示了各种键类型中一致的稀疏性模式,有助于计算材料科学.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 计算材料科学科学 计算材料科学
- 量子化学 是一个量子化学.
背景情况:
- 定位的万尼尔轨道对于理解固体中的电子结构至关重要.
- 在大型超级细胞中构建这些轨道是计算密集的.
- 现有的方法面临着不同的粘合类型和材料系统的挑战.
研究的目的:
- 研究大型超级细胞中局部Wannier轨道的结构和空间特性.
- 开发和评估Wannier轨道定位的高效算法.
- 为了分析轨道定位和材料特性之间的关系,跨越不同的结合类型.
主要方法:
- 使用Pipek-Mezey (PM) 函数与内在原子轨道 (IAO) 形成内在键轨道 (IBO).
- 采用平面波作为大型超级细胞计算的基础.
- 评估了用于轨道定位的各种优化算法 (BFGS,CG,SA,DIIS) 的性能和扩展.
主要成果:
- 观察到轨道扩散和几何性质之间的相关性,独立于结合类型和带间隙.
- 在Hartree-Fock交换矩阵中发现了可比的稀疏性模式,用于共价,极性共价和离子键.
- 证明金属氧化物对于万尼尔轨道构造需要显著更多的计算努力.
结论:
- 内在键轨道为分析不同材料的局部电子结构提供了一致的框架.
- 对于万尼尔轨道定位的高效算法对于大规模的材料模拟至关重要.
- 构建局部Wannier轨道的计算成本因材料类型而异,金属氧化物构成一个特殊的挑战.
相关概念视频
02:40MO Theory and Covalent Bonding
13.5K
The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
13.5K
02:38Valence Bond Theory and Hybridized Orbitals
27.6K
According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
27.6K
02:35Molecular Orbital Theory I
46.8K
Overview of Molecular Orbital Theory
46.8K
03:51Molecular Orbital Theory II
26.9K
Molecular Orbital Energy Diagrams
26.9K
02:42Valence Bond Theory
11.2K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.2K
02:45Valence Bond Theory
49.5K
Overview of Valence Bond Theory
49.5K