Events at Physics |
Events on Tuesday, April 5th, 2022
- Academic Calendar
- Election Day
- Time: 7:00 am - 8:00 pm
- Abstract: Election for School Board, County Supervisor, and Judges. Election for School Board, County Supervisor, and Judges. Go to MyVote.wi.gov to find your polling place, see what is on your ballot, and check your registration. If you are not registered at your current address, you can register at your polling place on Election Day. See vote.wisc.edu for information on registration and voter ID. CONTACT: malischke@wisc.edu URL:
- R. G. Herb Condensed Matter Seminar
- Quantum stochastic resonance of individual Fe atoms
- 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