Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 30: Poster Session - Surface Magnetism
O 30.7: Poster
Monday, March 16, 2020, 18:15–20:00, P1A
Quantum Stochastic Resonance in a Single Atom — •Gregory McMurtrie1, Max Hänze1,2, 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.
The behavior of fluctuating spins is particularly relevant in nanoscale materials, where it determines the observable magnetic phases as well as giving rise to exciting phenomena such as quantum critical behavior.
Accessing these dynamic phenomena on their intrinsic atomic length and time scales is an important step towards an understanding of their underlying quantum behavior.
Scanning tunneling microscopy experiments with high frequency signals [1, 2] both give access to the spin dynamics of nanostructures as well as allowing them to be resolved in real space on the atomic scale.
In particular, by applying a small harmonic voltage signal, stochastic resonance [3] can be induced, leading to a synchronization of the spin state evolution.
This phenomenon has never been observed previously in atomic systems, and gives unprecedented access to the time domain behavior of spins, even allowing transduction of picosecond-speed dynamics.
References 1. S. Loth, Science 329 1628 (2010) 2. S. Baumann, Science 350 6259 (2015) 3. R. Benzi, J. Phys. A: Math. Gen 14, L453 (1981)