来自时间依赖密度功能响应理论的激发状态密度
Anna Baranova1, Neepa T Maitra1
1Department of Physics, Rutgers University, Newark, New Jersey 07102, United States.
研究人员开发了一种新方法来计算现实空间中的兴奋状态密度,使用服装的时间依赖密度函数理论 (TDDFT). 这种方法准确地捕捉了双激发特征,改善了各种近似的密度计算.
科学领域:
- 量子化学 是一个量子化学.
- 计算物理 计算物理
- 理论化学 理论化学
背景情况:
- 激发状态能量可以通过时间依赖密度函数理论 (TDDFT) 中的变化原理来获得.
- 现实空间中激发状态密度的质量,特别是与不同的交换相关函数和非adiabatic近似的质量,仍未得到充分探索.
- 现有的方法难以处理具有双激发特性的密度.
研究的目的:
- 为激发状态密度推导一个实时空间表达式,该表达式包含非adiabatic内核.
- 为了能够计算具有双激发特征的状态的密度.
- 评估激发状态密度的不同近似的性能.
主要方法:
- 为激发状态密度的实空间表达式的推导,包括非adiabatic内核.
- 服装TDDFT方法的应用.
- 在1D模型系统上对本地密度近似 (LDA) 和精确交换 (EXX) 近似进行比较.
- 对局部和电荷转移激发的分析.
主要成果:
- 对于激发状态密度的新型实体空间表达式得到了推导.
- 该方法成功地为具有双激发特征的状态产生密度.
- 穿着TDDFT方法在1D模型中表现出双激发密度的良好性能.
- 对比强调了LDA和EXX近似的行为.
结论:
- 开发的真实空间表达和穿着的TDDFT方法提供了准确的激发状态密度,特别是对于双重激发.
- 这项工作在TDDFT中计算激发状态密度方面取得了重大进展.
- 这些发现为激发状态的基本功能近似的性能提供了洞察力.
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