Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 118: Surface Magnetism II (joint session O/MA)
O 118.12: Talk
Friday, March 20, 2020, 13:15–13:30, GER 38
Quantum stochastic resonance of single Fe atoms — •Max Hänze1,2, Gregory McMurtrie1, Luigi Malavolti1,2, 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
Stochastic resonance [1] can be observed in a variety of different systems, ranging from the periodicity of glacial periods in paleontology [2] to the time-dependent behavior of individual neurons [3] in the field of neuroscience. All such systems exhibit stochastic behavior which, because of a strong nonlinear response, can be synchronized to a small harmonic excitation. We observe quantum stochastic resonance in a single Fe atom deposited on the copper nitride surface [4] using scanning tunneling microscopy. Unlike in standard stochastic resonance, the atomic-scale process is dominated by quantum fluctuations where the magnetic state of the Fe atom is driven resonantly between two states in a classically forbidden regime. This phenomenon enables the direct observation of spin dynamics in open quantum system.
[1] R. Benzi, J. Phys. A: Math. Gen 14, L453 (1981) [2] P. N. Pearson et al. Paleontological Society Papers 18, 1-38 (2012) [3] A. J. Bulsara et al. Theor. Biol. 152, 531-555 (1991) [4] C. F. Hirjibehedin et al. Science 317, 1199-1203 (2007)