Abstract
Specific matrix elements of exchange and correlation kernels in time-dependent density-functional theory are computed. The knowledge of these matrix elements not only constrains approximate time-dependent functionals. It also allows one to link different practical approaches to excited states, based either on density-functional theory or on many-body perturbation theory, despite the approximations that have been performed to derive them.
- Received 4 February 1999
DOI:https://doi.org/10.1103/PhysRevLett.82.4416
©1999 American Physical Society