Equation-of-Motion Block-Correlated Coupled Cluster Method with up to Three-Block Correlation for Excited Electronic States of Strongly Correlated Systems
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Updated: May 16, 2025

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
Haodong Zhang1, Jingxiang Zou2, Xiaochuan Ren1
1State Key Laboratory of Coordination Chemistry, Key Laboratory of Mesoscopic Chemistry of Ministry of Education, New Cornerstone Science Laboratory, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, People's Republic of China.
Abstract:
The equation-of-motion generalized valence bond (GVB) based block-correlated coupled cluster approach with up to three-block correlation (termed EOM-GVB-BCCC3) has been implemented to describe low-lying excited states of strongly correlated systems with large active spaces. The computational time of EOM-GVB-BCCC3 scales as the fifth power of the system size. The method is then applied to investigate low-lying excited states in several strongly correlated systems. Our results demonstrate that EOM-GVB-BCCC3 could provide satisfactory results for the excited states with different spin multiplicities as the complete active space configuration interaction or the density matrix renormalization group method. EOM-GVB-BCCC3 shows significant improvement compared to EOM-GVB-BCCC2b proposed previously. This work demonstrates the potential of EOM-GVB-BCCC3 as a promising tool in investigating low-lying excited states of strongly correlated systems with large active spaces.
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