Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 71: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 2
O 71.8: Talk
Thursday, September 8, 2022, 17:15–17:30, S051
Path-resolved measurement of ultrafast spin dynamics — •Nicolaj Betz1, Max Hänze1,2, Gregory McMurtrie1, Susanne Baumann1, and Sebastian Loth1,2 — 1University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 2Max Planck Institute for Solid State Research, Stuttgart, Germany
Transitions between quantum mechanical states are fundamentally random processes. While it is possible to directly observe individual quantum jumps [1] in a time resolved measurement [2], the dynamics of many systems exceed the resolution of real time measurements. This requires the use of time-averaged measurements such as pump probe experiments. These methods typically measure state occupation times and contain little information about the relaxation process itself. Here, we introduce a dynamic response measurement that is sensitive to the switching path between spin states and can be applied in scanning tunneling microscopy. By using stochastic resonance [3], this method resolves spin- switching dynamics of magnetic atoms and nanostructures ranging from milliseconds to picoseconds. Crucially, in more complex spin structures the measurement can distinguish multiple switching paths between higher excited states. This provides deeper insight into ultrafast spin dynamics than possible with relaxometry.
[1] Th. Sauter, et al. Phys. Rev. Lett. 57, 1696 (1986).
[2] M. Hänze, et al. Sci. Adv. 7, 33 (2021).
[3] R. Löfstedt, et al. Phys. Rev. Lett. 72, 1947 (1994).