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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-6907
DTSTART:20220405T150000Z
DTEND:20220405T160000Z
DTSTAMP:20260414T113417Z
LAST-MODIFIED:20220325T211435Z
LOCATION:5310 Chamberlin
SUMMARY:Quantum stochastic resonance of individual Fe atoms\, R. G. He
 rb Condensed Matter Seminar\, Sue Coppersmith\, UNSW Sydney
DESCRIPTION:Stochastic resonance\, where noise synchronizes a systemâ€
 ™s response to an external drive\, is a phenomenon that occurs in a wi
 de variety of noisy systems ranging from the dynamics of neurons to th
 e periodicity of ice ages. This talk will present theory and experimen
 ts on a quantum system that exhibits stochastic resonance — the quan
 tum 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 t
 unneling of the magnetization\, as well as in a semi-classical crossov
 er region where thermal excitations set in. An analytic theory with no
  adjustable parameters agrees quantitatively with experiment\, and pro
 vides a path towards probing dynamics on time scales shorter than can 
 be resolved experimentally.
URL:https://www.physics.wisc.edu/events/?id=6907
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