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相关概念视频

Fermi Level Dynamics01:12

Fermi Level Dynamics

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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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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非代的费米-洛丁轨道器用于自我相互作用校正.

Juan E Peralta1, Koblar A Jackson1, Mark R Pederson2

  • 1Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, United States.

The journal of physical chemistry. A
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概括
此摘要是机器生成的。

我们开发了一种更快的非代费米-洛丁轨道自我相互作用校正 (NIFLOSIC) 方法. 这种方法有效地纠正电子结构计算,提高了无代步骤的分子性质的准确性.

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科学领域:

  • 计算化学是一种计算化学.
  • 电子结构理论 电子结构理论
  • 量子化学是一种量子化学.

背景情况:

  • 自相互作用误差是密度函数理论 (DFT) 中的一个重要问题.
  • 传统的费米-洛夫丁轨道自我相互作用校正 (FLOSIC) 需要费米轨道描述器 (FOD) 的计算成本昂贵的代放松.

研究的目的:

  • 引入一个计算效率高的非代费米-洛丁轨道自我相互作用校正 (NIFLOSIC) 方法.
  • 为大规模电子结构计算提供FLOSIC可扩展的替代方案.

主要方法:

  • 通过使用密度矩阵局部化方案的选定列消除代FOD放松,开发了NIFLOSIC.
  • 利用了电子定位函数和FODs之间的关系.
  • 采用了通用的Kohn-Sham框架,并进行了完全密度放松,以最大限度地减少Perdew-Zunger能量函数.

主要成果:

  • 尼弗洛西克在一个单一的,非代的步骤中产生局部轨道和FOD.
  • 该方法复制了完全自相一致的FLOSIC计算结果.
  • 与传统的FLOSIC相比,计算成本大幅降低.

结论:

  • 尼弗洛西克 (NIFLOSIC) 提供了一种实用且可扩展的解决方案,用于电子结构中的自我相互作用校正.
  • 该方法精确地提高了边界分子轨道能量和二极极时刻.
  • 尼弗洛西克 (NIFLOSIC) 适用于大规模应用,尽管总电子能量对于热化学不是理想的.