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SUMMARY:Dynamically localized but deconfined excitations in strained class
 ical spin ice - Jonathan Nilsson Hallen (Harvard)
DTSTART:20241120T140000Z
DTEND:20241120T153000Z
UID:TALK223705@talks.cam.ac.uk
CONTACT:Bo Peng
DESCRIPTION:We study classical spin ice under uniaxial strain along the [1
 11] crystallographic axis. Remarkably\, such strain preserves the extensiv
 e ice degeneracy and the corresponding classical Coulomb phase. The emerge
 nt monopole excitations remain thermodynamically deconfined exactly as in 
 the isotropic case. However\, their motion under local heat bath dynamics 
 depends qualitatively on the sign of the strain.\nIn the low-temperature l
 imit for negative strain\, the monopoles diffuse\, \nwhile for positive st
 rain\, they localize. Introducing additional ring exchange dynamics into t
 he ice background transforms the localized monopoles into sub-dimensional 
 excitations whose motion is restricted to diffusion in the (111)-plane. Th
 e phenomena we identify are experimentally accessible in rare-earth pyroch
 lores under uniaxial stress as well as in tripod kagome materials. The dif
 fusive versus localized nature of the monopoles manifests in characteristi
 c magnetic noise spectra\, which we compute.
LOCATION:TCM Seminar Room
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