Document Type
Article
Publication Date
2-1-2024
Abstract
We revisit Kohn–Sham time-dependent density-functional theory (TDDFT) equations and show that they derive from a canonical Hamiltonian formalism. We use this geometric description of the TDDFT dynamics to define families of symplectic split-operator schemes that accurately and efficiently simulate the time propagation for certain classes of DFT functionals. We illustrate these with numerical simulations of the far-from-equilibrium electronic dynamics of a one-dimensional carbon chain. In these examples, we find that an optimized 4th order scheme provides a good compromise between the numerical complexity of each time step and the accuracy of the scheme. We also discuss how the Hamiltonian structure changes when using a basis set to discretize TDDFT and the challenges this raises for using symplectic split-operator propagation schemes.
Publication Source (Journal or Book title)
Communications in Nonlinear Science and Numerical Simulation
Recommended Citation
Mauger, F., Chandre, C., Gaarde, M., Lopata, K., & Schafer, K. (2024). Hamiltonian formulation and symplectic split-operator schemes for time-dependent density-functional-theory equations of electron dynamics in molecules. Communications in Nonlinear Science and Numerical Simulation, 129 https://doi.org/10.1016/j.cnsns.2023.107685