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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-5163
DTSTART:20190919T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260307T120536Z
LAST-MODIFIED:20190903T153738Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Optical control of free-electron decoherence\, R. G. Herb Cond
 ensed Matter Seminar\, Wayne Huang\, Northwestern University
DESCRIPTION:In electron grating diffraction\, the peak width in the di
 ffraction pattern is a direct measure of the free electron transverse 
 coherence length. A broadened peak indicates decoherence of the free e
 lectron wavepacket. Using the above band-gap photoexcitation\, we crea
 ted a charge pattern on a GaAs surface that interacts with the diffrac
 ted electron matter wave through a dipole field. We observed a signifi
 cant broadening of the diffraction peak as electrons flew over certain
  regions of the charge structure. The decoherence strength can be cont
 rolled through the excitation laser that is applied to the GaAs plate.
  As only one electron is present in the chamber at any time\, such a s
 ystem is suitable for studying decoherence of single electrons. In thi
 s talk\, I will present some recent experimental results and discuss a
  possible decoherence model. 
URL:https://www.physics.wisc.edu/events/?id=5163
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