Many of the non-adiabatic processes in the condensed phase are affected by the interaction with the environment, as exemplified by Marcus theory. However, non-adiabatic molecular dynamics simulations with explicitly including the environment are computationally expensive because of the extended system size, suggesting the need for an efficient scheme applicable to huge systems. In this work, time-derivative non-adiabatic coupling (TDNAC) calculation algorithms were developed in the framework of the divide-and-conquer (DC) time-dependent (TD) density-functional tight-binding (DFTB) method, which is an extension of the TD-DFTB for larger systems based on the fragmentation-based DC scheme. The developed algorithms were incorporated into a fewest-switches trajectory surface hopping (FSSH) routine. The calculated TDNAC and the FSSH results were sufficiently accurate compared to the conventional TD-DFTB results. Use of the DC-TD-DFTB provided a significant reduction in the central processing unit (CPU) time vs that of the TD-DFTB, where the CPU time remained constant irrespective of the total system size. It was also confirmed that the present method is not only efficient but also improves the numerical stability of TDNAC calculations.
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14 June 2020
Research Article|
June 12 2020
Non-adiabatic molecular dynamics with divide-and-conquer type large-scale excited-state calculations
Special Collection:
65 Years of Electron Transfer
Hiroki Uratani
;
Hiroki Uratani
1
Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University
, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
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Hiromi Nakai
Hiromi Nakai
a)
1
Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University
, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
2
Waseda Research Institute for Science and Engineering (WISE)
, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
3
Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University
, Katsura, Kyoto 615-8245, Japan
a)Author to whom correspondence should be addressed: nakai@waseda.jp
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a)Author to whom correspondence should be addressed: nakai@waseda.jp
Note: This paper is part of the JCP Special Topic on 65 Years of Electron Transfer.
J. Chem. Phys. 152, 224109 (2020)
Article history
Received:
March 07 2020
Accepted:
May 21 2020
Citation
Hiroki Uratani, Hiromi Nakai; Non-adiabatic molecular dynamics with divide-and-conquer type large-scale excited-state calculations. J. Chem. Phys. 14 June 2020; 152 (22): 224109. https://doi.org/10.1063/5.0006831
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