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TT: Fachverband Tiefe Temperaturen
TT 61: Ultrafast Dynamics of Light-Driven Systems (joint session TT/MA)
TT 61.9: Vortrag
Donnerstag, 19. März 2020, 17:15–17:30, HSZ 201
Ultrafast electronic correlations in ordered phases — •Riku Tuovinen1, Denis Golež2, Martin Eckstein3, and Michael A. Sentef4 — 1QTF Centre of Excellence, Turku Centre for Quantum Physics, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland — 2Center for Computational Quantum Physics, Flatiron Institute, 162 Fifth Avenue, New York, NY 10010, USA — 3Department of Physics, University of Erlangen-Nürnberg, 91058 Erlangen, Germany — 4Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany
We consider many-body correlations in an excitonic-insulator system acting as a prototypical ordered-phase material [1]. Out-of-equilibrium dynamics in such systems with a symmetry-broken ground state has been shown to be extremely sensitive to all the intricacies in the electronic structure [2]. For an accurate description of the important and interesting mechanisms we take into consideration strong external fields, many-body correlations, and transient effects at an equal footing by the nonequilibrium Green’s function technique [3]. We drive the system out-of-equilibrium by a laser pulse, and we compare the resolved dynamics between the Kadanoff-Baym equations and the computationally less expensive generalized Kadanoff-Baym Ansatz [4].
[1] S. Mor et al. Phys. Rev. Lett. 119, 086401 (2017)
[2] R. Tuovinen et al. Phys. Status Solidi B 256, 1800469 (2018)
[3] G. Stefanucci and R. van Leeuwen, Nonequilibrium Many-Body Theory of Quantum Systems, CUP (2013)
[4] R. Tuovinen et al. in preparation