Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 47: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 1
O 47.6: Topical Talk
Mittwoch, 7. September 2022, 16:30–17:00, S051
Free coherent evolution of a coupled atomic spin system initialized by electron scattering — •Sander Otte1, Lukas Veldman1, Laetitia Farinacci1, Rasa Rejali1, Rik Broekhoven1, Jeremie Gobeil1, David Coffey1, and Markus Ternes2,3 — 1Delft University of Technology, Delft, The Netherlands — 2RWTH Aachen University, Aachen, Germany — 3Forschungszentrum Jülich, Jülich, Germany
Full insight into the dynamics of a coupled quantum system depends on the ability to follow the effect of a local excitation in real-time. Here, we trace the free coherent evolution of a pair of coupled atomic spins by means of scanning tunneling microscopy. Rather than using microwave pulses, we use a direct-current pump-probe scheme to detect the local magnetization after a current-induced excitation performed on one of the spins. By making use of magnetic interaction with the probe tip, we are able to tune the relative precession of the spins. We show that only if their Larmor frequencies match, the two spins can entangle, causing angular momentum to be swapped back and forth. These results provide insight into the locality of electron spin scattering and set the stage for controlled migration of a quantum state through an extended spin lattice.