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SUMMARY:Witnessing the Quantum Spin Liquid in Herbertsmithite - Prof. Feli
 x Flicker (Bristol)
DTSTART:20251113T140000Z
DTEND:20251113T153000Z
UID:TALK231697@talks.cam.ac.uk
CONTACT:Bo Peng
DESCRIPTION:Herbertsmithite is a leading candidate to host a quantum spin 
 liquid -- a long sought state of matter featuring long-range quantum entan
 glement and fractionalised 'spinon' excitations. However\, despite two dec
 ades' work\, definitive evidence remains lacking. One complicating factor 
 is that the material features significant disorder in the form of magnetic
  impurities.\n\nI will outline recent work in which we utilise these impur
 ities as 'witnesses' to probe the quantum spin liquid. Using spin noise sp
 ectroscopy to measure magnetization fluctuations originating from witnesse
 s\, we find unusual 1/f noise developing below a cusp in DC magnetic susce
 ptibility at 260mK. Ageing effects confirm spin glass formation among witn
 esses.\n\nI will present a microscopic model of witness interactions media
 ted by a Z2 quantum spin liquid. Despite having only one free parameter\, 
 the model gives a quantitative match to all experiments\, including a spin
  glass transition\, the temperature dependence of the susceptibility\, the
  temperature and frequency dependence of the noise spectrum\, the Curie We
 iss temperature\, and the previously observed neutron scattering intensity
  as a function of momentum transfer.\n\nhttps://arxiv.org/abs/2510.11678
LOCATION:Seminar Room 3\, RDC
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