Dresden 2026 – scientific programme

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O: Fachverband Oberflächenphysik

O 17: Spins on surfaces at the atomic scale – Poster

O 17.5: Poster

Monday, March 9, 2026, 18:00–20:00, P2

Study of correlated spin interactions in bottom-up assembled molecular structures — •Lars Pütz^1,2,3, Daria Sostina^1,2,3, Stefan Tautz^1,3,4, and Markus Ternes^1,2,3 — ¹Peter Grünberg Institut (PGI-3); Forschungszentrum Jülich, 52425 Jülich, Germany — ²Experimentalphysik II B, RWTH Aachen University, 52072 Aachen, Germany — ³Jülich Aachen Research Alliance (JARA), Fundamenatls of Future Information Technology, 52425 Jülich Germany — ⁴Experimentalphysik IV A, RWTH Aachen University, 52072 Aachen, Germany

Correlated physics hosts phenomena such as unconventional superconductivity and exotic magnetic phases, yet their theoretical description is often challenging. To provide a starting point, we investigate finite correlated systems. We study NTCDA molecules deposited on an Ag(111) surface using a low-temperature scanning tunneling microscope. These molecules can receive an additional electron from the surface, which turns each of them into a spin-1/2 system. Normally, this spin is screened by the substrate through the Kondo effect. By using molecular manipulation techniques, we built small molecular structures in which the spin-exchange interaction between two neighboring molecular spins overcomes the screening from the surface. In these structures, we observe singlet-triplet excitations. Moreover, these excitations exhibit a spatially varying bias asymmetry in scanning tunneling spectroscopy, reflecting the phase pattern of the triplet wave function and thus providing experimental access to it.

Keywords: Correlated physics; Low temperature; Scanning tunneling microscopy; Molecular structures; Kondo effect