Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (7): 2227.doi: 10.7503/cjcu20210314

• Article • Previous Articles     Next Articles

Generalized Energy-based Fragmentation Clustering Algorithm for Localized Excited States

DU Jiahui, LIAO Kang, HONG Benkun, WANG Zhongye, MA Jing, LI Wei(), LI Shuhua()   

  1. Institute of Theoretical and Computational Chemistry,Key Laboratory of Mesoscopic Chemistry,Ministry of Education,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China
  • Received:2021-05-07 Online:2021-07-10 Published:2021-07-07
  • Contact: LI Shuhua E-mail:wli@nju.edu.cn;shuhua@nju.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21833002)

Abstract:

Generalized energy-based fragmentation(GEBF) approach can approximately express the local excitation(LE) energy of large system as a linear combination of the excitation energies of a series of active subsystems. Thus, it reduces the computational scaling of the excited-state calculations for large systems. Howe-ver, it is still a challenge to effectively identify the excitation characteristics of all active subsystems and combine the excitation energies when the total system has multiple localized excitations. Here, a clustering algorithm for localized excited states was proposed. This scheme is based on hole-electron analysis and density-based spatial clustering of applications with noise(DBSCAN) algorithm in machine learning, which can automatically collect the excited states with maximum similarity in different subsystems and combine the corresponding localized excited-state energies or excitation energies. With this algorithm, the improved LE-GEBF approach has shown satisfactory results in various systems including derivatives of fluorescent molecules, fluorescent dye-water clusters, and green fluorescent protein models. This algorithm is expected to greatly improve the stabilities and accuracies of the LE-GEBF approach for calculating localized excitations, and can effectively treat large systems with multiple peaks in the absorption spectrum.

Key words: Localized excitation, Energy-based fragmentation, Machine learning, Clustering, Hole-electron analysis

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