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Mathematical Physics Seminar

Webinar: Susan Coppersmith - Quantum stochastic resonance of individual Fe atoms 

Location:  Zoom
Date & time: Wednesday, 06 March 2024 at 10:45AM - 11:45AM

MATHEMATICAL PHYSICS WEBINAR
RUTGERS UNIVERSITY

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Susan Coppersmith – UNSW Sydney

Wednesday, March 6th, 10:45AM EST 

Quantum stochastic resonance of individual Fe atoms 

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. 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.