Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 68: Focus Session: Time-Resolved Momentum Microscopy

O 68.5: Topical Talk

Thursday, September 8, 2022, 16:30–17:00, H3

Momentum and energy dissipation of hot electrons in metals and metal-molecular heterostructures — •Benjamin Stadtmueller — Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — Institute of Physics, JGU Mainz, 55128 Mainz, Germany

The dynamics of optically excited carriers in condensed matter play a crucial role in many fundamental and device-relevant processes in materials. Here, I discuss the potential of time-resolved two-photon momentum microscopy (tr-2PMM) [1] to access the k-space signatures and the corresponding quasi-particle lifetimes of excited carriers in metals [2,3] and metal-molecular heterostructures. For metallic systems, I will demonstrate that tr-2PMM allows us to uncover anisotropies in the orientations of optical transition dipoles for highly free electron like noble metal surfaces [2] and to follow the ultrafast intra- and interband scattering processes of optically excited carriers in metallic quantum well systems [3] in real-time. In this context, I will also introduce two approaches to alter the electron dynamics of metal surfaces by the adsorption of molecular complexes or by periodically modulating the surface potential using porous molecular networks on surfaces. Finally, I will show our efforts to exploit the spatial resolution in tr-2PMM to disentangle the k-space signatures of photo- and plasmon-induced hot carriers at surfaces [4]. [1] F. Haag et al., Rev. Sci. Instrum. 90, 103104 (2019); [2] T. Eul et al. Nat. Commun. (2022); [3] F. Haag et al. Phys. Rev. B 104, 104308 (2021); [4] M. Hartelt et al. ACS Nano 15, 19559 (2021)