Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 59: Spins on Surfaces at the Atomic Scale I
O 59.5: Talk
Wednesday, March 19, 2025, 11:30–11:45, H6
Vibrational excitations in magnetic triangular nanographenes — Nils Krane1, •Elia Turco1, Annika Bernhardt2, Michal Juríček2, Roman Fasel1,3, and Pascal Ruffieux1 — 1Empa - nanotech@surfaces Laboratory, 8600 Dübendorf, Switzerland — 2University of Zurich, Zurich, Switzerland — 3University of Bern, Bern, Switzerland
Inelastic electron tunneling spectroscopy has become a powerful tool for the investigation of excited states in single molecules and other quantum dot systems. These excited states can be of various origins, notably from higher energy spin states but also from vibrational modes. Especially in the case of carbon-based molecules, featuring π-magnetism with strong exchange coupling, both excitation mechanisms can be found within one system. Here, we present a simple method to distinguish between these two mechanisms by spatial map-ping of the excited states without any need for high magnetic fields. As a model system, we investigate the spin S=1/2 phenalenyl radical on Au(111) and observe the featuring of two excited states via inelastic tun-neling spectroscopy. Comparison with DFT calculations proofs the vibrational origin of the observed inelastic features and allows us to assign them to distinct vibrational modes.
Keywords: Molecular Vibrations; Phenalenyl; pi-magnetism; STS; STM