SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 31: Mini-Symposium: Manipulation and control of spins on functional surfaces I
O 31.2: Vortrag
Dienstag, 2. März 2021, 11:00–11:15, R2
Quantum Stochastic Resonance in Fe atoms and Nanostructures — •Gregory McMurtrie1, Max Hänze1,2, Susanne Baumann1, Luigi Malavolti2, Susan N. Coppersmith3, 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 — 3School of Physics, University of New South Wales, Sydney, Australia
Stochastic resonance [1], where noise synchronizes a system's response to an external modulation, is a widespread phenomenon found in systems ranging from the dynamic behavior of neurons [2] to the periodicity of glaciation [3]. Here we apply stochastic resonance to open quantum systems, namely atoms and nanostructures strongly coupled to a dissipative bath, which unlocks a path to resonant interaction that does not require coherence. In particular, applying modulation via a scanning tunneling microscope's tip gives control of the spin state evolution in this resonant regime of spin dynamics in both real-time and real-space on the atomic scale. This phenomenon has never been observed previously in atomic systems, and gives unprecedented insight into the interaction of quantum spins and their noise sources, even allowing transduction of picosecond-speed dynamics. [1] R. Benzi, J. Phys. A: Math. Gen 14, L453 (1981) [2] A. J. Bulsara et al. Theor. Biol. 152, 531-555 (1991) [3] P. N. Pearson et al. Paleontological Society Papers 18, 1-38 (2012)