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DTSTART;TZID=America/Toronto:20230301T110000
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URL:/institute-for-quantum-computing/events/quantum-mat
 ters-seminar-series-quantum-spin-liquids-and
SUMMARY:Quantum Matters Seminar Series: Quantum Spin Liquids and Criticalit
 y\nin Multipolar Materials
CLASS:PUBLIC
DESCRIPTION:Summary \n\nYONG-BAEK KIM: QUANTUM SPIN LIQUIDS AND CRITICALITY
  IN MULTIPOLAR\nMATERIALS\n\nAbstract: Multipolar quantum materials posses
 s local moments carrying\nhigher-rank quadrupolar or octupolar moments. Th
 ese higher-rank\nmultipolar moments arise due to strong spin-orbit couplin
 g and local\nsymmetry of the crystal-electric-field environment. In magnet
 ic\ninsulators\, the interaction between multipolar local moments on\nfrus
 trated lattices may promote novel quantum spin liquids. In heavy\nfermion 
 systems\, the interaction between multipolar local moments and\nconduction
  electrons may lead to unusual non-Fermi liquids and quantum\ncriticality.
  In this talk\, we first discuss a novel quantum spin ice\nstate\, a three
 -dimensional quantum spin liquid with emergent gauge\nfield\, that may ha
 ve been realized in Ce2Zr2O7 and Ce2Sn2O7\, where\nCe3+ ions carry dipol
 ar-octupolar moments. We present a theoretical\nanalysis of possible quant
 um spin ice states in this system and\ncompare the theoretical results of 
 dynamical spin structure factors\nwith recent neutron scattering experimen
 ts. Next\, we present a\ntheoretical model to describe the unusual Kondo e
 ffect and quantum\ncriticality in Ce3Pd20Si6\, where Ce3+ moments carry a
  plethora of\ndipolar\, quadrupolar\, and octupolar moments. We show that 
 two\nconsecutive Kondo-destruction-type phase transitions can occur with\n
 the corresponding Fermi surface reconstructions. We compare these\nresults
  with existing experiments and suggest future ultrasound\nexperiments for 
 the detection of emergent quantum critical behaviors.\n 
DTSTAMP:20250519T055828Z
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