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DESCRIPTION:Structured Light\, a Portal to Dark Matter?\n\nWeakly interacti
 ng axion pseudoscalar particles are leading candidates for cold dark matter
 . Proposed as a solution to the strong Charge-Parity problem\, they possess
  Parity-Time (𝓟𝒯) symmetry and primarily interact through the Lagrangian ℒ 
 ~ E ∙ B term\, which makes them unresponsive to transverse electromagnetic 
 fields where E ∙ B = 0. Interactions involving E ∙ B ≠ 0 can occur in a con
 densed phase\, but such 𝓟𝒯 symmetry magnetoelectric fields cannot propagate
  in vacuum. At metal-vacuum interfaces\, we generate and image evanescent f
 ields propagating as surface plasmon polaritons at a velocity of 15 nm/50 a
 s\, using ultrafast nonlinear photoelectron microscopy. We observe that str
 uctured light\, evolving through spin-orbit interaction\, forms plasmonic v
 ortices that serve as sources of an evanescent E ∙ B ≠ 0 term at their phas
 e-singularity cores. Within the IQ Initiative\, we consider the topological
  dressing of matter by 𝓟𝒯-symmetric light as a portal for interaction with 
 synthetic axion quasiparticles and potentially with cosmological axion dark
  matter.
DTEND:20260217T210000Z
DTSTAMP:20260316T212333Z
DTSTART:20260217T200000Z
GEO:40.44508;-79.957697
LOCATION:Allen Hall\, 321
SEQUENCE:0
SUMMARY:PQI Distinguished Seminar - Hrvoje Petek
UID:tag:localist.com\,2008:EventInstance_51879158736041
URL:https://calendar.pitt.edu/event/pqi-distinguished-seminar-hrvoje-petek
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