Volume 84, Number 4, November 2008
Article Number 43001
Number of page(s) 6
Section Atomic, Molecular and Optical Physics
Published online 10 November 2008
EPL, 84 (2008) 43001
DOI: 10.1209/0295-5075/84/43001

Strong-field ionization in time-dependent density functional theory

A. S. de Wijn1, M. Lein2 and S. Kümmel1, 3

1   Max-Planck-Institut für Physik komplexer Systeme - Nöthnitzer Strasse 38, D-01187 Dresden, Germany, EU
2   Institut für Physik, Universität Kassel - D-34132 Kassel, Germany, EU
3   Physikalisches Institut, Universität Bayreuth - D-95440 Bayreuth, Germany, EU

received 18 July 2008; accepted in final form 9 October 2008; published November 2008
published online 10 November 2008

Ionization in a strong laser field is a prime example of non-perturbative, correlated electron dynamics. Simulating such processes on a first-principles basis is a major theoretical challenge. We demonstrate that time-dependent density functional theory (TDDFT) on the basis of a newly developed functional for the correlation potential incorporates the relevant electron interaction effects. The central idea of our approach is to exploit information about exact ground-state correlation in approximate time-dependent calculations. The new functional provides an accurate description of the paradigm problem of the double ionization of the Helium atom, showing that TDDFT is a viable tool for strong-field calculations.

PACS - Time-dependent density functional theory.
32.80.Rm - Multiphoton ionization and excitation to highly excited states.
71.15.Mb - Density functional theory, local density approximation, gradient and other corrections.

© EPLA 2008