SAMOP 2021 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 14: Interaction with strong or short laser pulses
A 14.1: Hauptvortrag
Mittwoch, 22. September 2021, 10:45–11:15, H1
Improving the scaling in many-electron quantum dynamics simulations — •Michael Bonitz1, Niclas Schlünzen1, Jan-Philip Joost1, and Iva Brezinova2 — 1Institut für Theoretische Physik und Astrophysik, Universität Kiel, Leibnizstr. 15 — 2Technical University Vienna
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], 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 within SOA and even the GW and dynamically screened ladder approximations which is a breakthrough for simulating the correlated electron dynamics. After demonstrating the linear scaling behavior we will discuss prospects for simulating the laser ionization dynamics in atoms [5].
[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 et al., Phys. Scripta T151, 014036 (2012)
[4] N. Schlünzen et al., Phys. Rev. Lett. 124, 076601 (2020); Joost et al., Phys. Rev. B 101, 245101 (2020)
[5] F. Lackner et al., Phys. Rev. A 95, 033414 (2017)