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CATEGORIES:Lecture/Presentation/Talk
DESCRIPTION:Condensed-matter systems provide alternative “vacua” exhibiting
  emergent low-energy properties dramatically different from those of the st
 andard model. A case in point is the emergent quantum electrodynamics (QED)
  in the family of magnetic materials known as quantum spin ice. The emergen
 t QED possesses many features familiar from our universe\, such as charges\
 , anti-charges and photons\, but also many unfamiliar one\, such as magneti
 c monopoles. Thus these magnetic insulators provide a laboratory for explor
 ing effective QED in regimes quite inaccessible to traditional Maxwell elec
 tromagnetism.\n\nIn this talk\, I will review the beautiful picture of how 
 QED emerges in these frustrated magnets.\nWe will then turn to several resu
 lts regarding its `fine structure'.\nWe will see that the fine structure co
 nstant 𝜶 -- the dimensionless coupling which controls the interactions betw
 een emergent light and charges -- generically takes values ~0.1 in quantum 
 spin ice\, much larger than the 𝜶 ~ 1/137 of our universe [1].\nThis leads 
 to a variety of predictions regarding the coherent dynamics of the spinons 
 which we expect can be probed by neutron scattering [2].\nFinally\, we will
  consider how true electric fields couple into this magnetic insulator -- a
 nd may permit the indirect observation of the emergent magnetic monopole an
 d a curious 'inverted' Lorentz force [3].\n\n[1] Pace\, Morampudi\, Moessne
 r\, Laumann. Phys. Rev. Lett. 127\, 117205 (2021).\n[2] Morampudi\, Wilczek
 \, Laumann. Phys. Rev. Lett. 124\, 097204 (2020).\n[3] Laumann\, Moessner. 
 arXiv:2302.06635.
DTEND:20231031T233000Z
DTSTAMP:20260314T205254Z
DTSTART:20231031T223000Z
GEO:37.428953;-122.172839
LOCATION:Hewlett Teaching Center\, 201
SEQUENCE:0
SUMMARY:Applied Physics / Physics Colloquium: Chris Laumann - "The fine str
 ucture of quantum spin ice"
UID:tag:localist.com\,2008:EventInstance_44633083721165
URL:https://events.stanford.edu/event/applied_physics_physics_colloquium_ch
 ris_laumann_-_the_fine_structure_of_quantum_spin_ice
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