在Cu-chalcogenides中推进DFT预测,具有完全但浅的3d轨道:Meta-GGA加上Hubbard-like U校正
1Minjiang Collaborative Center for Theoretical Physics, College of Physics and Electronic Information Engineering, Minjiang University, Fuzhou 350108, China.
研究人员评估了Cu-基化物的先进密度函数理论方法. r2SCAN+U方法为电子财产预测提供了准确性和计算效率的平衡.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学的计算化学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 铜化物 (Cu2Se,CuInSe2) 在技术上很重要,但由于Cu-3d轨道,其模型具有挑战性.
- 传统的密度函数理论 (DFT) 函数与准确的电子属性描述作斗争.
研究的目的:
- 评估最近开发的Cu-chalcogenides的元一般化梯度近似 (meta-GGA) 函数.
- 提高这些材料的电子结构计算的准确性.
主要方法:
- 应用了多个元-GGA函数,包括r2SCAN,到Cu-chalcogenides.
- 研究了哈巴德U校正对Cu-3d轨道的影响.
- 与实验数据,混合函数和GW近似结果进行比较.
主要成果:
- 与传统GGA相比,r2SCAN功能改进了几何结构和带结构,但显示了移位错误.
- 通过将r2SCAN与U校正 (r2SCAN+U) 结合起来,可以减轻移位错误.
- TASK 和 mBJ+U 显示出良好的频段差距预测准确度,可相互比较,但低于 GW.
- r2SCAN+U精确地复制了CuInSe2.2中的声子分散.
结论:
- 对Cu-chalcogenides而言,Meta-GGA+U方法提供了可靠性和计算成本之间的良好平衡.
- 为了更精确的Cu-3d轨道描述,需要进一步的工作.
- r2SCAN+U解决了CuInSe2声计算中以前被忽视的计算问题.
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