Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 71: Ultrafast Phenomena
TT 71.5: Vortrag
Donnerstag, 12. März 2026, 10:30–10:45, HSZ/0103
Ultrafast coherent dynamics in open quantum systems: Auger-Meitner decay and controlled stearing of interactions in SF6 — •Sina Shokri1, Patrick Rupprecht2,3, Thomas Pfeifer3, and Maurits W. Haverkort1 — 1ITP, Universität Heidelberg, 69120 Heidelberg, Germany — 2UC Berkeley Dept. of Chemistry and LBNL Chemical Sciences Division, Berkeley, CA 94720, USA — 3MPI für Kernphysik, 69117 Heidelberg, Germany
Ultrafast x-ray pump-probe spectroscopy provides a powerful tool to study and steer quantum materials on their intrinsic time and length scales. In correlated molecules and solids, theoretical understanding remains challenging due to the interplay of competing interactions. In small molecules, quantitative modeling of the coupled electronic and vibrational dynamics is possible.
The coupling to many continuous degrees of freedom can lead to rapid loss of coherence. This results in long-time dynamics that are determined by classical equations of motion. Descriptions on the intermediate time scale that show how one goes from coherent quantum dynamics to classical equations of motion are highly non-trivial.
In this work, we employ nonlinear response theory to predict the transient dynamics and Auger-Meitner-induced lifetimes of electronic excitations in x-ray absorption spectroscopy of SF6, following excitation by an intense infrared laser field. Based on first-principles density functional theory calculations, we show how the intense laser field can modify the Auger-Meitner decay channels and, with that, the coherent lifetimes of excitations.
Keywords: Ultrafast; pump-probe; strongly correlated; XAS; Auger-Meitner decay