Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 83: Organic molecules on inorganic substrates: electronic, optical and other properties III
O 83.10: Talk
Thursday, March 12, 2026, 17:15–17:30, HSZ/0201
Magnetic Excitations in on-surface metallacrown complexes — •Robert Ranecki1,2, Stefan Lach2, Anne Lüpke3, Angeliki Athanasopoulou3, Eva Rentschler3, and Christiane Ziegler2 — 1QNS, Seoul, Korea — 2RPTU Kaiserslautern-Landau and OPTIMAS, Kaiserslautern, Germany — 3Inst. of Inorganic and Analytical Chemistry, JGU Mainz
The implementation of quantum information processing demands achieving electrical control over spin-qubits that can be integrated into scalable architectures. Addressing this challenge, multi-spin-carrying molecules on surfaces offer a route to surface-integrable qubits: chemically diverse with tunable spin properties. However, the interaction with the supporting substrate can dramatically modify the electronic and magnetic properties of such complexes. Here, we present spin-flip inelastic tunneling spectroscopy studies of pentanuclear metallacrown complexes, CuCu4 and CuFe4, under adsorption onto Au(111) surface. By comparing the experimental results with perturbative electron transport model simulations[1], we extract quantitative values of the exchange coupling constants and determine the ground spin states of the metallacrown complexes[2]. These findings advance our understanding of the spin interactions in complex molecular systems adsorbed on surfaces, paving the way towards future quantum technologies.
[1] Ternes, M. New J. Phys. 17, 063016 [2] Ranecki, R. et al., J. Phys. Chem. C 127, 13186; Ranecki, R. et al., J. Phys. Chem. C 126, 15907
Keywords: Magnetic molecules; Molecular spintronics; Scanning tunneling microscopy/spectroscopy; Spin-flip inelastic tunneling spectroscopy; Electrospray Deposition