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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-4405
DTSTART:20170131T180000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T043320Z
LAST-MODIFIED:20170117T223112Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Building materials from light: Photonic Landau levels and Rydb
 erg-mediated interactions\, Atomic Physics Seminar\, Ariel Sommer\, MI
 T
DESCRIPTION:Advances in the control of light propagation and photon-ph
 oton interactions have lead to a new notion of photonic materials -- s
 tates of light that resemble material systems. I will describe our exp
 erimental approach to photonic materials\, in which we use a degenerat
 e non-planar optical resonator to realize a two-dimensional photon gas
  with an effective magnetic field. We observe photonic Landau levels\,
  indicating a strong effective magnetic field\, and a singularity of s
 patial curvature arising from the effectively conical geometry of our 
 photon gas. Spatial curvature provides a novel probe of quantum Hall s
 tates\, allowing us to make the first experimental measurement of the 
 mean orbital spin\, which characterizes topological phases. To realize
  photon-photon interactions\, we demonstrate hybridization of photons 
 in an optical resonator with atomic Rydberg excitations. Future work w
 ill investigate ordered states of interacting photons\, including crys
 talline and fractional quantum Hall states.
URL:https://www.physics.wisc.edu/events/?id=4405
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