Hannover 2010 – scientific programme

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A: Fachverband Atomphysik

A 21: Interaction with Strong or Short Laser Pulses I

A 21.4: Talk

Thursday, March 11, 2010, 15:00–15:15, F 107

An adiabatic approximation in time-dependent density functional theory based on ground-state spin-density functional theory — •Ingo Dreissigacker and Manfred Lein — Institut für Theoretische Physik and Centre for Quantum-Engineering and Space-Time Research (QUEST), Leibniz Universität Hannover, Appelstr. 2 , 30167 Hannover

We investigate strong-field ionization of the Helium atom within time-dependent density functional theory with adiabatic exchange correlation (xc) potentials. While simple adiabatic approximations such as the adiabatic local density approximation are known to fail badly for the double ionization process in Helium, it has been demonstrated that the exact adiabatic xc potential is close to the exact xc potential [1]. We report here a new adiabatic method in which the Hartree-xc-potential is obtained as the difference between the adiabatically exact Kohn-Sham potential and the external potential that yields the given density using ground-state exchange-only spin-density functional theory for the interacting system. In contrast to the exact adiabatic potential, our scheme does not require the solution of the interacting two-electron Schrödinger equation. We present results for a model Helium atom.

[1] M. Thiele, E. K. U. Gross, and S. Kümmel, Phys. Rev. Lett. 100, 153004 (2008).