SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 77: Scanning Probe Techniques: Method Development II
O 77.7: Vortrag
Donnerstag, 30. März 2023, 12:00–12:15, REC C 213
Phase compensation for ultrafast dynamic measurements of atomic spins — •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
Understanding spin dynamics is vital for a wide range of applications , such as qubit manipulation. However, in many cases, especially for single atoms on surfaces, even stroboscopic measurement techniques, like pump-probe or pulsed electron spin resonance, do not provide enough time resolution to resolve the dynamics of the individual (atomic) spins. Such measurements are generally limited by the attenuation and distortion of the sharp pulses, that inevitably occurs due to imperfections in the instrumental setup. The attenuation in the frequency domain can be measured and compensated for [M. Herve, et al. Appl. Phys. Lett. 107, 093101, 2015]. However, such a compensation only has limited impact on the distortion. Here, we introduce a new technique, that enables the measurement of the phase shift between individual frequencies directly in the tunnel junction of a scanning tunneling microscope (STM). Using these phase shifts it is now possible to fully compensate arbitrary pulses and manipulate atomic spins with picosecond time resolution. Phase information also provides additional insights into stochastic resonance, an effect we recently utilized as an alternative way to measure spin dynamics [M. Hänze, et al. Sci. Adv. 7, 33, 2021], even of multiple spin states.