Berlin 2024 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 16: Crystal Structure Defects / Real Structure / Microstructure I
KFM 16.1: Vortrag
Mittwoch, 20. März 2024, 15:00–15:20, E 124
Ultrafast laser induced structural motion in crystalline and amorphous gold — •Othmane Benhayoun1, Emiliano Princippi2, Bernd Bauerhenne3, Dmitry Ivanov4, and Martin Garcia1 — 1University of Kassel, Theoretical physics II, Kassel, Germany — 2Elettra-Sincrotrone Trieste S.C.p.A., Trieste, Italy — 3University of Kassel, Theoretical physics I, Kassel, Germany — 4Moscow, Russia
An Ultrafast Electron Diffraction (UED) experiment showed a time-dependent nonuniform compression and expansion of a monocrystalline gold foil. This led to the time modulation of the Au Bragg peaks in both height and width that was measured by the experiment. The same effect is however not observed in polycrystalline gold. We thus perform Molecular Dynamics - Two Temperature Model (MD-TTM) simulations aiming to understand the results of the experiment. In our simulations, we obtain similar peak oscillations and determine the major mechanisms that lead to such lattice dynamics in the monocrystalline case and compare them with the polycrystalline case.
Keywords: Bragg Peaks; Molecular Dynamics; Structure factor; Electron diffraction; Large scale simulations