14sep5:00 pm7:00 pmNicolaj BetzUniversity of Stuttgart, Institute for Functional Matter and Quantum Technologies5:00 pm - 7:00 pm KST ZOOM Application
Nicolaj Betz Academic Affiliation: University of Stuttgart, Institute for Functional Matter and Quantum Technologies Date and Time of the Talk: Sept 14th, 2021;
Academic Affiliation: University of Stuttgart, Institute for Functional Matter and Quantum Technologies
Date and Time of the Talk: Sept 14th, 2021; 17:00 – 19:00 (KST)
New insights into spin dynamics – Stochastic resonance as a tool
Stochastic scattering between magnetic atoms and electrons of a metal shortens excitation lifetimes and accelerates decoherence. However, this scattering also creates characteristic time scales, that carry information about dynamics of the system. Modulating the scattering close to a threshold leads to frequency-dependent synchronization of the spin of the magnetic atoms and the modulation . This
effect, known as Stochastic Resonance, amplifies the dynamic response to the modulation and can be used to investigate quantum fluctuations of the system . Here we introduce a measurement technique which uses the synchronization effect that underlies Stochastic Resonance to control and measure characteristic time scales of magnetic atoms with a scanning tunneling microscope. This enables the investigation of spin dynamics in a bandwidth ranging from milliseconds to picoseconds. In some spin structures this reveals multiple switching paths between higher excited states, thus providing insight into new, previously inaccessible dynamics.
 Hänze et al., Sci. Adv. 2021, 7 (2021).
 R. Löfstedt, S. N. Coppersmith, Phys Rev. Lett. 72, 1947 (1994)
(Tuesday) 5:00 pm - 7:00 pm KST