Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 66: Poster: Nanostructures at Surfaces

O 66.18: Poster

Mittwoch, 20. März 2024, 18:00–20:00, Poster C

Confinement and band dispersion of excited surface electrons in a two-dimensional porous network on a metallic surface — •Lukas Kau, Martin Mitkov, Ralf Hemm, Lyu Lu, Martin Anstett, Martin Aeschlimann, and Benjamin Stadtmüller — University of Kaiserslautern-Landau and Research Center OPTIMAS, Erwin-Schrödinger Str. 46, 67663 Kaiserslautern, Germany

Two-dimensional metal-organic networks (MONs) on noble-metal surfaces are highly tuneable porous architectures for designing the electronic properties of surfaces by quantum confinement. In this study, we investigate the electron confinement and the corresponding band structure of the excited surface electrons, i.e. the image potential state (IPS), in a self-assembled Cu-coordinated T4PT porous network on a Cu(111) surface. Using two-photon photoemission spectroscopy, we are able to map the band dispersion of the IPS, which reveals a remarkably flat band dispersion and a large effective band mass of approximately 2m0. Compared to the occupied Shockley electrons, the excited electrons in the IPS exhibit a strong confinement in the Cu-T4PT porous network [1]. This substantially different confinement of the Shockley surface and the IPS electrons is rooted in the vertical potential landscape of the network structure. Finally, we provide a first glimpse into the hot electron dynamics of the IPS.

[1] Lyu, Lu, et al. arXiv preprint arXiv:2307.06814 (2023)

Keywords: 2D networks; Photoemission; Surface State; Image Potential State; Metal-organic networks