Abstract
The possibility of formulating a density-functional theory for time-dependent systems is studied in the linear-response regime. Two results are obtained: (i) The work of Runge and Gross is generalized to a finite time interval with an arbitrary form of the external potential; and (ii) there exists no zero in the mapping for all under a very general thermodynamic condition.
- Received 22 June 1987
DOI:https://doi.org/10.1103/PhysRevLett.59.2627
©1987 American Physical Society