Multicomponent density-functional theory for time-dependent systems

O. Butriy*, H. Ebadi, P. L. de Boeij, R. van Leeuwen, E. K. U. Gross

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

We derive the basic formalism of density functional theory for time-dependent electron-nuclear systems. The basic variables of this theory are the electron density in body-fixed frame coordinates and the diagonal of the nuclear N-body density matrix. The body-fixed frame transformation is carried out in order to achieve an electron density that reflects the internal symmetry of the system. We discuss the implications of this body-fixed frame transformation and establish a Runge-Gross-type theorem and derive Kohn-Sham equations for the electrons and nuclei. We illustrate the formalism by performing calculations on a one-dimensional diatomic molecule for which the many-body Schrodinger equation can be solved numerically. These benchmark results are then compared to the solution of the time-dependent Kohn-Sham equations in the Hartree approximation. Furthermore, we analyze the excitation energies obtained from the linear response formalism in the single pole approximation. We find that there is a clear need for improved functionals that go beyond the simple Hartree approximation.

Original languageEnglish
Article number052514
Number of pages17
JournalPhysical Review A
Volume76
Issue number5
DOIs
Publication statusPublished - Nov-2007

Keywords

  • LASER-PULSE
  • NONEQUILIBRIUM PROCESSES
  • POLYATOMIC-MOLECULES
  • SCHRODINGER-EQUATION
  • ELECTRON CORRELATION
  • DOUBLE-IONIZATION
  • NUCLEAR
  • MOTIONS
  • FIELDS
  • MODEL

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