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O: Fachverband Oberflächenphysik
O 69: Nanostructures at Surfaces II
O 69.7: Vortrag
Mittwoch, 19. März 2025, 16:30–16:45, H25
Active manipulation of interface electronic structures by two-dimensional metal-organic coordination on metallic substrates — •Lu Lyu1,2, Jonas Gödde2, Martin Anstett2, Martin Aeschlimann2, and Benjamin Stadtmüller1 — 1Experimentalphysik II, Institute of Physics, Augsburg University, 86159 Augsburg, Germany — 2Department of Physics, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
Designing two-dimensional metal-organic coordination networks (2DMOCNs) on metallic substrates provides a unique approach for engineering interface electronic structures. To achieve this goal, we first investigate a protocol of pyridine-functionalized T4PT molecules with Co coordination (Co-T4PT) adsorbed on Au(111). In this system, the surface state electrons are bound to the Co metal centers, and charge transfer occurs between the Co and the substrate. By substituting the Co center with a Cu atom, the surface state electrons in the Cu-T4PT coordination exhibit weaker binding to the Cu centers and are partially confined within the pores surrounded by the molecular potentials. Additionally, replacing T4PT with cyano-functionalized DCA enhances the coordination between Co and DCA, resulting in altered charge transfer within the Co-DCA plane. Consequently, the orbital states of DCA undergo modifications in both energy and momentum space. Our study demonstrates that the manipulation of coordinated metals and functionalized molecules can actively tailor electronic structures at a 2DMOCN-metal interface.
Keywords: Metal-organic coordination networks (MOCNs); 2,4,6-tris(4- pyridyl)-1,3,5triazine (T4PT); 9,10-dicyanoanthracene (DCA); Scanning Tunneling Microscopy (STM); Angle Resolved Photoemission Spectroscopy (ARPES)