SKM 2023 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 4: Thin Film Properties I
DS 4.1: Vortrag
Montag, 27. März 2023, 15:30–15:45, SCH A 316
Ultrafast laser induced structural motion in crystalline and amorphous gold — •Othmane Benhayoun1, Emiliano Princippi3, Bernd Bauerhenne1, Dmitry S. Ivanov2, and Martin E. Garcia1 — 1University of Kassel, Theoretical physics II, Kassel, Germany — 2Moscow, Russia — 3Elettra-Sincrotrone Trieste S.C.p.A., Trieste, Italy
A recent 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. 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.