Use of noncollinear exchange-correlation potentials in multiplet resolutions by time-dependent density functional theory

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Abstract

The resolution of spin-multiplets in an electronic system with a spin-degenerate ground state requires a method that can deal with spin-flip excitations. We recently showed that time-dependent density functional theory (TDDFT) can treat such excitations provided that use is made of a noncollinear exchange-correlation (XC) potential. The new formulation is a generalization of conventional TDDFT. The form of the new formulation is exactly the same as that of the conventional TDDFT for transitions that do not involve spin-flips. However, the noncollinear TDDFT formulation allows in addition for spin-flip transitions. In the present account, we explain in more detail why a noncollinear formulation of the XC potential is required. © 2006 Wiley Periodicals, Inc.

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Wang, F., & Ziegler, T. (2006). Use of noncollinear exchange-correlation potentials in multiplet resolutions by time-dependent density functional theory. International Journal of Quantum Chemistry, 106(12), 2545–2550. https://doi.org/10.1002/qua.21050

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