Strong-field ionization in time-dependent density functional theoryA. 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.
31.15.ee - 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.
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