Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 17: Spins on surfaces at the atomic scale – Poster
O 17.2: Poster
Montag, 9. März 2026, 18:00–20:00, P2
Towards faster dynamics of magnons in atomic spin chains — Christina Mier1, Alexandra Meerovici Goryn1, •Michael Schelchshorn1, Lukas Veldman2, and Sander Otte1 — 1Delft University of Technology, Delft, The Netherlands. — 2University of Stuttgart, Stuttgart, Germany.
The coherent free evolution of coupled atomic spins [1] as well as electron and nuclear spins within a single atom [2] has previously been demonstrated using ESR-STM. Extending this approach to atomically assembled spin chains, provides a tunable platform for investigating magnon transport and interactions; by exploiting the spectral resolution of ESR-STM, we achieve controlled excitation and tuning of coherent spin-wave modes while pump-probe techniques allow us to directly map their dynamics on a nanosecond time scale. In particular, by engineering stronger exchange coupling both within the chain itself and to the readout atom, we observe many more oscillations within the coherence times, demonstrating dynamical timescales significantly faster than those reported by Veldman et al. [1]. This work addresses the coherent magnon dynamics within precisely engineered atomic spin chains and paves the way for probing more complex collective excitations in larger spin systems.
[1] Veldman, L.M., et al., Science, 2021. 372(6545): p. 964-968.
[2] Veldman, L.M., et al., Nature Communications, 2024. 15(1): p. 7951.
Keywords: atomic-scale; spin chains; pump-probe techniques; ESR-STM; magnon