報告時間:2023年5月27日(星期六)9:15-10:00
報告地點:科教樓B座704會議室
報 告 人:胡偉 特任研究員
工作單位:中國科學技術大學
舉辦單位:物理學院
報告簡介:
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.
參考文獻:
[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).
報告人簡介:
胡偉,博士,中國科學技術大學任特任研究員,博士生導師。于2013年博士畢業于中國科學技術大學,隨后加入美國勞倫斯伯克利國家實驗室進行應用數學博士后研究,2018年入職中國科學技術大學任特任研究員,博士生導師。胡偉博士的研究領域為理論與計算化學,致力于發展針對大尺度分子固體材料的第一性原理密度泛函理論低標度計算的新算法,同時開發高性能并行計算軟件KSSOLV、PWDFT、HONPAS和DGDFT,并將其應用到材料模擬設計。主要研究方向:大規模密度泛函理論計算,密度泛函理論方法,密度泛函理論高性能計算軟件開發,量子計算算法,機器學習、深度學習和神經網絡算法及應用,高性能并行計算方法,數值計算算法。