Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 16: Interaction with strong or short laser pulses I
A 16.1: Invited Talk
Wednesday, March 11, 2020, 11:00–11:30, a320
Photoionization dynamics of many-electron atoms: an accelerated Green functions approach — •Michael Bonitz, Niclas Schlünzen, Jan-Philip Joost, and Maximilian Rodriguez Rasmussen — Institut für Theoretische Physik und Astrophysik, Universität Kiel, Leibnizstr. 15
The accurate description of the nonequilibrium dynamics of correlated electrons in atoms under laser excitation remains a key topic in many fields. Among others, the nonequilibrium Green functions (NEGF) method has proven to be a powerful tool to capture electron-electron correlations [1]. However, NEGF simulations are computationally expensive due to their T3 scaling with the simulation duration T. With the introduction of the generalized Kadanoff-Baym ansatz [2] (GKBA), T2 scaling could be achieved for second order Born (SOA) selfenergies [3], which has substantially extended the scope of NEGF simulations. Recently [4], we could achieve linear scaling with SOA and even GW selfenergies which is expected to lead to breakthroughs for simulating the correlated electron dynamics.
[1] K. Balzer and M. Bonitz, Lect. Notes Phys. 867 (2013)
[2] P. Lipavský et al., Phys. Rev. B 34, 6933 (1986)
[3] S. Hermanns, K. Balzer, and M. Bonitz, Phys. Scripta T151, 014036 (2012)
[4] N. Schlünzen et al., submitted for publication, arXiv:1909.11489 (2019)