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Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 26: Molecular Magnetism

MA 26.3: Talk

Wednesday, September 7, 2022, 15:30–15:45, H48

Study of VOPc/TiOPc layers on Ag(100) using X-ray absorption spectroscopy — •Jaehyun Lee1,2, Stefano Reale1,2, Kyungju Noh1,2, Luciano Colazzo1, Denis Krylov1, Christoph Wolf1, Andrin Doll3, Andreas Heinrich1,2, Yujeong Bae1,2, and Fabio Donati1,21Center for Quantum Nanoscience — 2Ewha Womans University, Seoul, Republic of Korea — 3Swiss Light Source, Paul Scherrer Institut (PSI), Villigen Switzerland

Vanadyl Phthalocyanine (VOPc) shows spin 1/2 and long coherence time of almost 1 microseconds up to room temperature [M. Atzori et al., J. Am. Chem.Soc. 138, 2154 (2016)]. Investigating the orbital splitting when absorbed on a surface and the interactions between the molecular spin and the supporting substrate is crucial to optimize their quantum coherence properties. Here, we use x-ray absorption spectroscopy to investigate the spin properties of VOPc on Ag(100) and on TiOPc/Ag(100). To interpret our data, we simulate x-ray spectra combining machine learning with multiplet calculations. We find that the interaction with the metal surface changes the orbital structure of VOPc when directly on the Ag(100). Decoupling from the metal using a TiOPc layer is sufficient to restore the spin and orbital structure of the free standing VOPc, which shows no changes upon annealing up to 450K. This robust molecular spin architecture shows the potential in quantum computing technology.

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