Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 84: Focus Session: Spins on Surfaces II (joint session O/MA)
O 84.8: Vortrag
Donnerstag, 4. April 2019, 17:00–17:15, H15
Broadband noise spectroscopy of antiferromagnetic iron dimers — •Gregory McMurtrie1,2,3, Max Hänze1,2,3, Luigi Malavolti1,2,3, and Sebastian Loth1,2,3 — 1Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 2Max Planck Institute for Structure and Dynamics of Matter, Hamburg, Germany — 3Max Planck Institute for Solid State Research, Stuttgart, Germany
Spin and charge dynamics are particularly pronounced in nanoscale materials, where they give rise to exciting effects such as quantum interference or quantum critical behavior. Accessing these dynamics on their intrinsic length and time scales is an important step towards a microscopic understanding of quantum physics on the atomic scale. Applying pulses [1] or continuous wave signals [2] to individual atoms has proven a powerful technique for the characterization of fast magnetic surface dynamics using scanning tunneling microscopy. We show that the dynamics of individual atoms can be observed in the frequency domain using broadband noise detection, thereby non-invasively revealing picosecond-scale fluctuations. This method is a powerful tool for characterizing both state lifetimes and measuring surface scattering effects, giving deeper insight into the fundamental dynamic behavior of spins coupled to dissipative environments. [1] S. Loth, M. Etzkorn, C. P. Lutz, D. M. Eigler, A. J. Heinrich, Science 329 1628 (2010) [2] S. Baumann, W. Paul, T. Choi, C. P. Lutz, A. Ardavan, A. J. Heinrich, Science 350 6259 (2015)