Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 37: Ultrafast electron dynamics at surface and interfaces – Poster (joint session O/TT)
TT 37.15: Poster
Dienstag, 10. März 2026, 14:00–16:00, P2
Photo-induced electron pressure drives THz phonon in Platinum-Copper superlattice — •Jan-Etienne Pudell1, Maximilian Mattern2,3, Marc Herzog2, Alexander von Reppert2, Daniel Schick3, Chandan Singh4, Peter M. Oppeneer4, Michel Hehn5, Ulrike Boesenberg1, Angel Rodriguez-Fernandez1, Roman Shayduk1, Wonhyuk Jo1, Johannes Möller1, Jörg Hallmann1, James Wrigley1, Matias Bargheer2,6, and Anders Madsen1 — 1European XFEL — 2University Potsdam — 3MBI, Berlin — 4Uppsala University — 5IJL, Université Lorraine — 6HZB Berlin
Using ultrafast X-ray diffraction (UXRD) at the MID end-station at the European XFEL, we investigate the ultrafast lattice dynamics of metal-metal superlattice (SL) with few atomic layers of Pt and Cu upon femtosecond photoexcitation. Our results reveal that the absorbed optical energy is rapidly localizes within the Pt layers, driving the excitation of a coherent artificial THz phonon mode defined by the superlattice period. The signal’s amplitude and phase modulation of the SL Bragg peaks induced by the lattice excitation i.e. the artificial THz phonon, are predominantly driven by electron pressure within the first picosecond. This response is faster than the Debye-Waller effect, which is limited by the electron-phonon coupling time.
Keywords: ultrafast; x-ray diffraction; thermal transport; phonon