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O: Fachverband Oberflächenphysik

O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces

O 36.8: Poster

Tuesday, March 19, 2024, 18:00–20:00, Poster C

Coherent Electron Dynamics Probed by Interferometrically Time- and Angle-Resolved Nonlinear Plasmoemission Spectroscopy with a Birefringent Delay-Line — •Pascal Dreher, Alexander Neuhaus, Michael Horn-von Hoegen, and Frank-J. Meyer zu Heringdorf — Faculty of Physics and Center for Nanointegration, Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47048 Duisburg, Germany

The early optical response of a solid to an intense light field is governed by single-particle and collective excitations within the electron system. Due to the perturbation, changes in the electron populations occur, and coherent electronic polarizations are excited. Interferometrically time-resolved two-photon photoemission (ITR-2PPE) has been highly successful at disentangling the population and polarization dynamics in various material systems. If instead multi-photon transitions are utilized (ITR-mPPE) the multitude of involved electronic states and their possible interactions complicate the extraction of lifetimes and dephasing times. We combined a birefringent delay-line with nano-focusing of surface plasmon polaritons (SPPs) on flat metal surfaces to acquire phase-locked pulses with transient electric field strengths sufficient to coherently drive highly nonlinear electronic transitions. The excited electron dynamics is observed using time- and angle-resolved photoemission spectroscopy. We discuss modelling of the dynamics with Lindblad equations and comment on the extraction of lifetimes and dephasing times in this highly nonlinear setting.

Keywords: Time-Resolved PEEM; Surface Plasmon Polaritons; Time-Resolved ARPES; Electron Dynamics; Lindblad Equations