Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 17: Poster Monday: Organic Molecules at Surfaces 1
O 17.6: Poster
Monday, September 5, 2022, 18:00–20:00, P4
Ultrafast dynamics of quantum confined surface electrons in a T4PT-based metal-organic network on noble metals — •Nils Bellenbaum1, Lu Lyu1, Eva Walther1, Tobias Eul1, Benito Arnoldi1, Martin Aeschlimann1, and Benjamin Stadtmüller1,2 — 1Technische Universität Kaiserslautern and Research Center OPTIMAS, Erwin-Schrödinger Straße 46, 67663 Kaiserslautern, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany
Two-dimensional metal-organic networks have emerged as intriguing architectures to design and control quantum confinment of electrons at surfaces. In our work, we focus on the metal-organic network T4PT/Cu(111) comprised of triangular 2,4,6-tris(4-pyridine)1,3,5-triazine (T4PT) molecules adsorbed on a copper substrate. Using momentum-resolved photoemission, we demonstrate a spatial confinement of the free electron-like surface state of Cu(111) in the pores of the network structure. Similarly, the dispersion of the unoccupied image potential state (IPS) of Cu(111) is modulated by the network's periodic potential, leading to a severe increase of the effective band mass of the IPS. Finally, we discuss the influence of periodic modulation of the IPS on its energy and momentum-dependent population time using timeresolved two photon momentum microscopy. Our findings provide a first glimpse onto tunabilitiy of the electron dynamics at surfaces by spatial confinement in nanoporous metal-organic network structures.