Adiabatic approximation in nonperturbative time-dependent density-functional theory

M. Thiele*, E. K.U. Gross, S. Kümmel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

123 Scopus citations

Abstract

We construct the exact exchange-correlation potential of time-dependent density-functional theory and the approximation to it that is adiabatic but exact otherwise. For the strong-field double ionization of the Helium atom these two potentials are virtually identical. Thus, memory effects play a negligible role in this paradigm process of nonlinear, nonperturbative electron dynamics. We identify the regime of high-frequency excitations where the adiabatic approximation breaks down and explicitly calculate the nonadiabatic contribution to the exchange-correlation potential.

Original languageAmerican English
Article number153004
JournalPhysical Review Letters
Volume100
Issue number15
DOIs
StatePublished - 18 Apr 2008
Externally publishedYes

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