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SYSD: Symposium SKM Dissertation Prize 2025

SYSD 1: SKM Dissertation Prize Symposium

SYSD 1.5: Hauptvortrag

Montag, 17. März 2025, 11:30–12:00, H2

Coherent Dynamics of Atomic Spins on a Surface — •Lukas Veldman — TU Delft, Department of Quantum Nanoscience, Delft, The Netherlands — University of Stuttgart, Institute for Functional Matter and Quantum Technologies, 70569 Stuttgart, Germany

Studying dynamical interactions between individual spins is vital for understanding exotic magnetic materials as well as for development of applications that require control over solid state spins like spintronics and quantum computation. Here, we introduce the possibility to inject a single spin flip with atomic precision into a magnetic nanostructure and trace the resulting coherent spin dynamics. We achieve this by combining electron spin resonance (ESR) and DC pump-probe techniques with scanning tunneling microscopy (STM). In our first proof-of-concept measurement, we apply this method to two coupled Ti atoms and resolve the resulting coherent flip-flop oscillations between their electron spins [1]. Next, we investigate larger structures up to 6 spins and study magnon dynamics in the few-atom limit [2]. Lastly, we resolve the magnetic dynamics between an electron and a nucleus within a single atom [3,4], further expanding the potential of this new measurement scheme to nuclear spins. These experiments add to the understanding of the microscopic mechanism behind magnetic interactions and open the door to detailed control of individual spins on surfaces for quantum coherent applications. [1] L.M. Veldman et al., Science 372 (2021) [2] L.M. Veldman et al., in preparation [3] L. Farinacci, L.M. Veldman et al., Nano Lett. 22 (2022) [4] L.M. Veldman et al., Nat. Commun. 15 (2024)

Keywords: Scanning Tunneling Microscopy; Electron Spin Resonance; Pump Probe Spectroscopy; Spin Dynamics