Wisconsin Quantum Institute

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Events During the Week of April 3rd through April 10th, 2022

Monday, April 4th, 2022

No events scheduled

Tuesday, April 5th, 2022

Quantum stochastic resonance of individual Fe atoms
Time: 10:00 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
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Wednesday, April 6th, 2022

No events scheduled

Thursday, April 7th, 2022

No events scheduled

Friday, April 8th, 2022

Exploring the Heart of Quantum Matter with Extreme Magnetic Fields
Time: 3:30 pm
Place: 2241 Chamberlin Hall
Speaker: Gregory Boebinger, NHMFL-FSU
Abstract: In the wide range of materials that are grouped under the heading of “Quantum Matter”, intrinsic electronic charges and spins conspire in weird and collective ways to create new materials properties. Magnetic fields are a valuable tool for probing the mysteries that remain at the heart of Quantum Matter, where Nature creates 1/3 fractional electric charges, “spin liquids” of fixed charges but mobile spins, and high-temperature superconductivity in which the very existence of electrons as distinct particles becomes uncertain.
Host: Alex Levchenko
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