Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 13: Organic Molecules on Inorganic Substrates: Adsorption and Growth
O 13.10: Vortrag
Montag, 17. März 2025, 17:15–17:30, H8
Towards 2D metal-organic frameworks on weakly interacting substrates: FeDCA on coinage metals and Bi2Se3(111) surfaces — •Anna Kurowská1, Matthias Blatnik1, Veronika Stará1, Pavel Procházka1, Čestmír Drašar2, and Jan Čechal1,3 — 1Central European Institute of Technology, Brno University of Technology — 2Faculty of Chemical technology, University of Pardubice — 3Institute of Physical Engineering, Brno University of Technology, Czech Republic
The formation of 2D metal-organic frameworks (MOFs) on a surface of topological insulator (TI) is a promising path to design quantum materials with exotic properties. MOFs featuring ferromagnetically coupled metal atoms are theoretically predicted to induce an exchange gap in the TI’s surface band structure, potentially leading to a quantum anomalous Hall effect. However, the knowledge of self-assembly on TI substrates is still scarce. Here, we demonstrate the first experimental realization of 2D MOF, Fe-dicyanoanthracene (FeDCA), on the surface of a strong TI Bi2Se3. The structure and morphology were studied via scanning tunneling microscopy (STM) and low-energy electron microscopy (LEEM) and diffraction (LEED). We compare the growth of FeDCA on the Bi2Se3(111) surface with coinage metals and gr/Ir(111) surfaces, and discuss the conditions at which we obtain typical mixed Kagomé-honeycomb lattice and at which a new hexagonal lattice appears. The demonstration of 2D MOF/TI hybrid material presents a milestone on the way toward their application in fault-tolerant spin interconnects in future quantum devices.
Keywords: metal-organic frameworks; topological insulator; Bi2Se3; DCA; Fe