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SUMMARY:Are the Ce pyrochlores quantum spin liquids - and how could we kno
 w for sure? - Owen Benton\, Queen Mary University of London
DTSTART:20251211T140000Z
DTEND:20251211T153000Z
UID:TALK240844@talks.cam.ac.uk
CONTACT:Gaurav
DESCRIPTION:Three-dimensional U(1) quantum spin liquids (QSLs) have long b
 een sought as condensed-matter realizations of emergent quantum electrodyn
 amics (QED). This emergent QED is rendered all the more intriguing by the 
 presence of magnetic monopoles\, strongly coupled to slow “photons”. Q
 uantum spin ices - arising in pyrochlore magnets with dominant Ising inter
 actions supplemented by transverse exchange - are among the most promising
  theoretical settings for this physics. Yet\, in practice\, many candidate
  materials have fallen short as structural disorder\, off-stoichiometry\, 
 or competing ordered states have obscured or destroyed the U(1) QSL phase.
 \n\nOver the last decade\, the family of Ce pyrochlores Ce₂M₂O₇ (M =
  Zr\, Sn\, Hf) has emerged as perhaps the best current platform for realiz
 ing a U(1) QSL. The Kramers nature of the Ce³⁺ ion provides some protec
 tion against disorder\, while its dipolar–octupolar ground-state doublet
  gives rise to an anisotropic XYZ Hamiltonian that theoretically stabilize
 s the U(1) QSL over a wide parameter range.\n\nIn this talk I will review 
 recent progress in understanding these materials\, with a view to evaluati
 ng the status of each one as a candidate U(1) QSL. While there are many co
 mmonalities between the Ce pyrochlores there are also subtle differences\,
  which may suggest different interpretations for each material.\n\nFinally
 \, I will discuss how nonlinear spectroscopy could provide a powerful tool
  for directly identifying spinon dynamics in quantum spin ice systems\, an
 d outline how such measurements might be applied to the Ce pyrochlores.
LOCATION:Seminar Room 3\, RDC
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