Events

Events at Physics

<< Fall 2021 Spring 2022 Summer 2022 >>
Subscribe your calendar or receive email announcements of events
R. G. Herb Condensed Matter Seminar
Quantum stochastic resonance of individual Fe atoms
Date: Tuesday, April 5th
Time: 10:00 am - 11:00 am
Place: 5310 Chamberlin
Speaker: Sue Coppersmith, UNSW Sydney
Abstract: 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. An analytic theory with no adjustable parameters agrees quantitatively with experiment, and provides a path towards probing dynamics on time scales shorter than can be resolved experimentally.
Host: Mark Eriksson
Add this event to your calendar