Time-dependent second Born calculations for model atoms and molecules in strong laser fields
Abstract
Using the finite-element discrete variable representation of the nonequilibrium Green's function (NEGF) we extend previous work [K.~Balzer et al., Phys. Rev. A \textbf{81}, 022510 (2010)] to nonequilibrium situations and compute---from the two-time Schwinger-Keldysh-Kadanoff-Baym equations---the response of the helium atom and the heteronuclear molecule lithium hydride to laser fields in the uv and xuv regime. In particular, by comparing the one-electron density and the dipole moment to time-dependent Hartree-Fock results on one hand and the full solution of the time-dependent Schr\"odinger equation on the other hand, we demonstrate that the time-dependent second Born approximation carries valuable information about electron-electron correlation effects. Also, we outline an efficient distributed memory concept which enables a parallel and well scalable algorithm for computing the NEGF in the two-time domain.
Keywords
Cite
@article{arxiv.1008.4621,
title = {Time-dependent second Born calculations for model atoms and molecules in strong laser fields},
author = {K. Balzer and S. Bauch and M. Bonitz},
journal= {arXiv preprint arXiv:1008.4621},
year = {2010}
}