Rabi Oscillations and Few-Level Approximations in Time-Dependent Density Functional Theory

Details Rabi Oscillations and Few-Level Approximations in Time-Dependent Density Functional Theory Rabi Oscillations and Few-Level Approximations in Time-Dependent Density Functional Theory

2009-06-08

arxiv.org/abs/0906.1556v1

Phys. Rev. Lett. 102, 233001 (2009)

Physics

Atomic Physics

4 pages, 4 figures, REVTeX-style

Scientific paper

The resonant interaction of laser light with atoms is analyzed from the time-dependent density functional theory perspective using a model Helium atom which can be solved exactly. It is found that in exact-exchange approximation the time-dependent dipole shows Rabi-type oscillations of its amplitude. However, the time-dependent density itself is not well described. These seemingly contradictory findings are analyzed. The Rabi-type oscillations are found to be essentially of classical origin. The incompatibility of time-dependent density functional theory with few-level approximations for the description of resonant dynamics is discussed.

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