最小追踪线性响应哈巴德和汉德在CP2K中纠正了密度函数理论
Ziwei Chai1, Rutong Si2, Mingyang Chen3
1Beijing Computational Science Research Center, Beijing 100193, China.
Journal of chemical theory and computation
|October 3, 2024
概括
我们在密度函数理论 (DFT + U + J) 中实现了Hubbard (U) 和Hund (J) 校正,用于材料科学. 这种先进的DFT+U+J方法通过完善电子结构计算,准确地预测材料特性.
科学领域:
- 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.
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 密度函数理论 (DFT) 经常需要对强相关材料的精确电子结构计算进行校正.
- 哈巴德 (U) 和亨德 (J) 校正 (DFT + U + J) 对于改善局部电子的描述至关重要.
研究的目的:
- 在CP2K软件套件中实现和验证DFT + U + J功能.
- 为计算U和J参数引入一个第一原则方法.
- 为了对各种材料属性的新实施与已建立的结果进行基准测试.
主要方法:
- 对 DFT + U + J 的张量和 Löwdin 子空间表示的实现.
- 分析DFT + U + J力量的发展.
- 集成最小追踪线性响应方法用于U和J参数计算.
- 使用NiO,TiO2和六化过渡金属进行基准测试.
主要成果:
- 在Quickstep (CP2K) 中成功实现和验证DFT + U + J功能.
- 在NiO和TiO2中准确预测带间隙,包括J校正的影响.
- 结果与材料性质的文献值一致.
- 对Löwdin或thonormalization对计算属性的影响的分析.
结论:
- 实施的DFT+U+J方法为准确的材料模拟提供了强大的工具.
- 对U和J参数的第一原则计算提高了预测能力.
- 该研究证实了U和J对相关材料的校正的重要性.
相关概念视频
02:48Henderson-Hasselbalch Equation
63.1K
The ionization-constant expression for a solution of a weak acid can be written as:
63.1K
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.3K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.3K
01:10Van der Waals Equation
4.8K
The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the...
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the...
4.8K
01:12Double Resonance Techniques: Overview
870
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
870
01:27The Debye–Hückel Theory of Electrolyte Solutions
353
The Debye–Hückel theory, established by Peter Debye and Erich Hückel in 1923, is a fundamental concept in physical chemistry. It provides an understanding of the behavior of strong electrolytes in solution, particularly explaining their deviations from ideal behavior.The theory is based on Coulombic interactions (the attraction or repulsion between charged particles) between ions in solution. In an ionic solution, oppositely charged ions tend to attract each other. This means...
353
01:28Debye–Huckel–Onsager Conductance Equation
291
The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect.
291