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O: Fachverband Oberflächenphysik

O 15: Spins on surfaces at the atomic scale I

O 15.10: Vortrag

Montag, 9. März 2026, 17:30–17:45, WILL/A317

Kondo physics of composite molecular spins made from coupled nanographenes — •David Jacob — Department of Physics, University of Alicante, Spain

Open-shell nanographenes can now be fabricated by on-surface synthesis (OSS) and stabilized on metallic substrates, enabling access to their intrinsic (multi)radical character. Scanning-tunneling spectroscopy (STS) reveals clear Kondo signatures, demonstrating that these nanographenes host quantum spins whose magnitude reflects their degree of radicality [1]. By covalently linking such magnetic nanographenes, coupled spin systems can be engineered in controlled geometries–including dimers [2], hexagons [3], chains [4], and other topologies–allowing quantum magnetism to be probed at the atomic scale. Here we investigate coupled nanographenes whose constituent units have different spin magnitudes. We show that the composite nature of the resulting effective molecular spin leads to a rich spectrum of spin excitations and to unconventional Kondo behavior.

References:

[1] JACS Au 3, 1358 (2023); Phys. Rev. Res. 6, L022061 (2024).

[2] Phys. Rev. B 106, 205405 (2022); Nano Lett. 23, 9353 (2023).

[3] Angew. Chem. Int. Ed. 60, 25224 (2021).

[4] Nature 588, 287 (2022).

Keywords: Nanographene; Quantum magnetism; Kondo effect; Spin excitations