Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 16: Scanning Probe Techniques: Method Development
O 16.3: Talk
Monday, March 17, 2025, 15:30–15:45, H25
Dynamics on the atomic-scale: Use and limitations of stochastic resonance spectroscopy — •Nicolaj Betz1,2, Vivek K. Rajathilakam1, Laëtitia Farinacci1,3, Susan N. Coppersmith4, Susanne Baumann1, and Sebastian Loth1,2 — 1University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 2Center for Integrated Quantum Science and Technology (IQST), University of Stuttgart, Stuttgart, Germany — 3Carl-Zeiss-Stiftung Center for Quantum Photonics Jena-Stuttgart-Ulm, Germany — 4School of Physics, University of New South Wales, Sydney, Australia.
Stochastic dynamics offer valuable insight into the internal structure of a system and its interactions with the environment. However, in atomic-scale systems investigated using scanning tunneling microscopy, comprehensive and accurate characterization is often a significant challenge. In this talk, we discuss a new type of measurement technique, stochastic resonance spectroscopy (SRS), that provides comparatively large signals over a wide range of timescales down to the picosecond range. It uses the effect of stochastic resonance, where the system's state synchronizes with an external harmonic drive. This encodes information about the dynamics in a time-independent signal. Such drive-induced imprinting of time-independent signals can alter the system's dynamics, but this limitation can be mitigated in SRS by its ability to identify and even tune these drive-induced dynamics. This enables targeted investigation of driven quantum systems on the atomic scale.
Keywords: scanning tunneling microscopy; spin dynamics