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胡伟:低秩近似在自旋电子结构计算中的应用

发布日期:2023-05-24 来源:bat365在线登录网站 阅读次数:

报告时间:2023527日(星期六)9:15-10:00

报告地点:翡翠科教楼B704会议室

报 告 人:胡伟 特任研究员

工作单位:中国科学技术大学


报告简介:

Low rank approximation algorithm is a powerful tool to reduce the computational scaling of large-scale complex electronic structures. In plane wave calculations, the adaptively compressed exchange (ACE) operator and interpolative separable density fitting (ISDF) algorithm greatly accelerate the hybrid functional calculations with single and multi-k point sampling, but the neglect of electron spin freedom limits its application in spin dependent electronic structures. We developed ACE-ISDF algorithms including spin degrees of freedom for large-scale systems and periodic systems respectively, and proposed a new ISDF algorithm. In addition, in the energy band calculation, we use an interpolation algorithm with gauge invariance to obtain the ACE operator of dense k lattice from the ACE operator of rough k lattice, thus accelerating the hybrid energy band calculation.

参考文献:

[1] Wei Hu*, Lin Lin*, and Chao Yang*, Phys. Chem. Chem. Phys. 17, 31397 (2015).

[2] Wei Hu*, Lin Lin*, and Chao Yang*, J. Chem. Phys. 143, 124110 (2015).

[3] Wei Hu, Xinming Qin, Fang Li, Hong An*, Jinlong Yang*, et al, Sci. Bull. 66, 111 (2021).

[4] Wei Hu, Hong An, Xinming Qin, Junshi Chen*, Jinlong Yang, et al, submitted (2021).


报告人简介:

胡伟,博士,中国科学技术大学任特任研究员,博士生导师。于2013年博士毕业于中国科学技术大学,随后加入美国劳伦斯伯克利国家实验室进行应用数学博士后研究,2018年入职中国科学技术大学任特任研究员,博士生导师。胡伟博士的研究领域为理论与计算化学,致力于发展针对大尺度分子固体材料的第一性原理密度泛函理论低标度计算的新算法,同时开发高性能并行计算软件KSSOLVPWDFTHONPASDGDFT,并将其应用到材料模拟设计。主要研究方向:大规模密度泛函理论计算,密度泛函理论方法,密度泛函理论高性能计算软件开发,量子计算算法,机器学习、深度学习和神经网络算法及应用,高性能并行计算方法,数值计算算法。