Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 92: Poster Session - Ultrafast Electron Dynamics at Surface and Interfaces II

O 92.8: Poster

Wednesday, March 18, 2020, 18:15–20:00, P2/1OG

Observation of electron excitation dynamics by time-resolved two-photon momentum microscopy based lifetime analysis — •Lars Pidde, Florian Haag, Tobias Eul, Eva Walther, Benjamin Stadtmüller, and Martin Aeschlimann — Department of Physics and research center OPTIMAS, TU Kaiserslautern

The investigation of the dynamics of hot electrons are fundamental to understand many chemical and physical phenomena at surfaces, interfaces or in bulk materials. The evolution of such electrons on ultrafast timescales are dominated by inelastic and elastic scattering processes which simultaneously affect both the electron energy and their momentum. To capture these complex dynamics, we present a data analysis scheme based on time-resolved two-photon momentum microscopy [Rev. Sci: Instrum. 90, 103104 (2019)]. It incorporates the well established tr-2PPE experiments, momentum resolved photoemission electron microscopy and either double hemispherical or time-of-flight energy analyzers. To determine lifetimes of electrons in predefined energy and momentum regions we present a data analysis scheme to create so called lifetime maps at constant energies.

The capability of this approach is exemplary illustrated by the study of a metallic surface.