新密度矩阵重规范化小组对与大环境相结合的强相关系统的方法
Yihe Xu1, Yifan Cheng1, Yinxuan Song1
1School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
Journal of chemical theory and computation
|July 20, 2023
概括
新的计算方法增强了密度矩阵重规范化组 (DMRG),用于模拟复杂的分子系统. 这些进步使得与大环境相互作用的强相关分子的准确建模成为可能.
科学领域:
- 量子化学 是一个量子化学.
- 计算物理 计算物理
- 许多身体理论.
背景情况:
- 密度矩阵重规范化组 (DMRG) 和它的时间依赖变体 (TD-DMRG) 对于模拟强烈相关的系统非常强大.
- 准确的描述需要考虑活跃子系统和大型环境之间的相互作用.
研究的目的:
- 引入新的后DMRG和TD-DMRG方法来处理复杂的系统环境相互作用.
- 将DMRG/TD-DMRG的适用性扩展到具有大环境的现实强相关系系统.
主要方法:
- 开发了DMRG2sCI-MRCI和DMRG2sCI-ENPT,使用精选配置交互 (sCI) 和多引用配置交互 (MRCI).
- 集成的DMRG与重新规范的基于残留的MRCI (RR-MRCI) 进行了整合,以提高准确性和效率.
- 引入了层次映射 (HM) -TD-DMRG,以将大型环境减少到基本模式.
主要成果:
- 新的方法使得电子结构和量子动力学的定量表征成为可能.
- 成功地将DMRG/TD-DMRG功能扩展到具有大,相关环境的系统.
- 避免了计算上昂贵的高阶n电子减少密度矩阵 (n-RDM).
结论:
- 提出的后DMRG和TD-DMRG方法显著推进复杂量子系统的模拟.
- 这些方法提供了一个更准确,更有效的方式来研究在现实的环境中强烈相关的分子.
更多相关视频
相关概念视频
Trends in Lattice Energy: Ion Size and Charge
24.0K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
24.0K
Network Covalent Solids
13.5K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.5K
Dimensionless Groups in Fluid Mechanics
373
Dimensionless groups in fluid mechanics provide simplified ratios that help analyze fluid behavior without relying on specific units. The Reynolds number (Re), which represents the ratio of inertial to viscous forces, distinguishes between laminar and turbulent flows, making it essential in the design of pipelines and aerodynamic surfaces. The Froude number (Fr), the ratio of inertial to gravitational forces, is particularly useful in predicting wave formation and hydraulic jumps in...
373
Equilibrium Conditions for a Particle
1.2K
When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
1.2K
Reduced Mass Coordinates: Isolated Two-body Problem
1.4K
In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
1.4K
2D NMR: Overview of Heteronuclear Correlation Techniques
231
Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
231


