Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 56: Frontiers of Electronic Structure Theory: Many-Body Effects on the Nano-Scale IV
O 56.5: Vortrag
Mittwoch, 18. März 2015, 16:15–16:30, MA 004
Plasmon assisted double photoemission — •Michael Schüler, Yaroslav Pavlyukh, and Jamal Berakdar — Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany
Coincidence measurements of double photoemission (DPE) represent a direct way of tracing the various facets of electronic correlations in molecular as well as extended systems, such as e. g. dynamical screening and collective excitations. One prominent example in this respect is the C60 molecule, for its plasmon resonances dominate the electronic excitation spectrum. Motivated by recent experiments on this molecule we demonstrate how the phenomenon of plasmon-mediated DPE can be described by an effective four-level system coupled to the bosonic plasmon excitations. The model generalizes the classical s-model and is treated within the GW approximation with the parameter estimates from ab initio calculations. We solve the coupled fermionic-bosonic time-dependent Kadanoff-Baym equations governing the dynamics of the model triggered by the interaction with the laser field. The use of the generalized Kadanoff-Baym Ansatz allows to significantly reduce the computation cost of our method.