使用紧固结合模型构建优化的紧固结合模型
Sejoong Kim1,2
1University of Science and Technology (UST), Gajeong-ro 217, Daejeon 34113, Republic of Korea.
概括
优化的紧固结合 (TB) 模型通过减少电子带结构的偏差来改进ab initio TB模型. 这种方法准确地复制了像雅努斯过渡金属二基因化物这样的材料的电子特性和旋转纹理.
科学领域:
- 计算材料科学科学 计算材料科学
- 凝聚物质物理学 凝聚物质物理学
- 量子化学 是一个量子化学.
背景情况:
- 初始紧固结合 (TB) 模型对于电子结构计算至关重要.
- 截断全密度函数理论 (DFT) 汉密尔顿主义者可以引入定量错误.
- 需要准确的TB模型来预测材料特性.
研究的目的:
- 开发一个基于原子轨道的优化紧固结合 (TB) 模型.
- 为了提高从DFT衍生出的ab initio TB模型的准确性.
- 精确复制材料的电子和自旋特性.
主要方法:
- 优化结核病模型,保留DFT哈密尔顿的定性特征.
- 在不同的邻居范围 (第二到第三邻居) 上切断DFT哈密尔顿式.
- 适用于半导体和金属的Janus过渡金属二二原体单层 (2H配置).
主要成果:
- 优化大大减少了带结构的定量偏差,而不是完全的DFT.
- 优化的TB模型准确地复制了局部电子属性,如带边和费米表面.
- 将旋转轨道相互作用纳入优化TB模型中可以复制旋转纹理.
结论:
- 提出的优化程序有效地提高了初始TB模型的准确性.
- 该方法提供了一种可靠的方法,用于从DFT数据中构建微调的TB模型.
- 优化的TB模型适用于研究各种电子和旋转相关现象.
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