+++ONLINE COLLOQUIUM+++Quantum stochastic resonance of individual Fe atoms (MCQST-Colloquium) (Prof. Susan Coppersmith)

(online)
Date: Mar 29, 2022
Time: 11:00 AM (Local Time Germany)
Speaker: Prof. Susan Coppersmith
University of New South Wales, Sydney, Australia

Stochastic resonance, where noise synchronizes a system’s response to an external drive, is a phenomenon that occurs in a wide variety of noisy systems ranging from the dynamics of neurons to the periodicity of ice ages. This talk will present theory and experiments on a quantum system that exhibits stochastic resonance — the quantum tunneling of the magnetization of a single Fe atom measured using spin-polarized scanning tunneling microscopy.

Stochastic resonance is shown deep in the quantum regime, where fluctuations are driven by tunneling of the magnetization, as well as in a semi-classical crossover region where thermal excitations set in. Combining theory and experiment enables one to probe the dynamics on time scales shorter than can be resolved experimentally.