Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 92: Nanostructures at Surfaces II
O 92.4: Vortrag
Donnerstag, 21. März 2024, 15:45–16:00, MA 042
Hot electron lifetime of confined image potential state in a metal-coordinated organic porous network — •Martin Mitkov, Lukas Kau, Ralf Hemm, Martin Anstett, Lu Lyu, Martin Aeschlimann, and Benjamin Stadtmüller — University of Kaiserslautern-Landau and Research Center OPTIMAS, Erwin-Schrödinger Str. 46, 67663 Kaiserslautern, Germany
Two-dimensional metal-organic porous networks (2DMOPNs) on noble metal surfaces are highly ordered quantum boxes for confining surface state electrons. For a long time, this approach has mainly been used for the confinement of surface electrons in Shockley-type surface states and has only recently been explored for excited electrons at surfaces1 , i.e., image potential state (IPS) electrons. In this contribution, we focus on the hot electron dynamics of quantum confinement IPS electrons in a 2D porous network. As a model system, we study the Cu-coordinated T4PT network on the Cu(111) surface for which the quantum confinement leads to a substantial increase in the effective band mass of the IPS electrons1. We use time-resolved two-photon photoemission spectroscopy to quantify the fs timescale hot electron dynamics and quasi-particle lifetimes of the confined electrons in the flat IPS bands. Our findings provide insight into the role of the quantum confinement for the hot electron dynamics in the 2DMOPNs.
[1] Lyu, Lu, et al. arXiv preprint arXiv:2307.06814 (2023).
Keywords: 2D networks; Metal-organic networks; Photoemission; Time-resolved photoemission