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O: Fachverband Oberflächenphysik
O 8: Nanostructures at surfaces:1D, 2D, networks I
O 8.1: Vortrag
Montag, 9. März 2026, 10:30–10:45, WILL/A317
Quantum confinement of excited states in a two-dimension metal-organic coordinated network — •Lu Lyu1, Martin Anstett2, Wei Yao3, Tobias Eul1, Martin Aeschlimann2, and Benjamin Stadtmüller1 — 1Experimentalphysik II, Institute of Physics, Augsburg University, Universitätsstraße 2, 86159 Augsburg, Germany — 2Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Straße 46, 67663 Kaiserslautern, Germany — 3Institute of Advanced Light Source Facilities, Shenzhen 518107, China
Quantum confinement effects of surface electrons in two-dimensional metal-organic coordinated networks (2D-MOCNs) provide a highly tunable platform for exploring the laws of quantum mechanics in condensed matter systems. Here, we focus on a porous network formed by coordinating pyridine-functionalized T4PT molecules with Co atoms on Au(111). One-photon photoemission (1PPE) experiments reveal a substantial energy shift of the Shockley surface state (SS) that is indicative of a hybridization with Co centers. This hybridization is responsible for a leaky channel for electrons between adjacent pores, which prevents the quantum confinement of SS electrons. In contrast, excited electrons into the unoccupied image potential states (IPS) reveal clear signatures of a substantial quantum confinement in a two-photon photoemission (2PPE) experiment. These contrasting observations of SS and IPS can be attributed to the 3D nature of the quantum well potential of the 2D-MOCNs and the distinct surface-perpendicular wave function distribution in the SS and the IPS.
Keywords: 2D Metal-organic coordinated networks (2D-MOCNs); Quantum confinement; One-photon photoemission (1PPE); Two-photon photoemission (2PPE); Scanning tunneling microscopy (STM)