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SUMMARY:Spin dynamics and hydrodynamical regimes of quantum matter - Prof 
 Joel Moore\, University of California\, Berkeley
DTSTART:20230614T150000Z
DTEND:20230614T160000Z
UID:TALK201607@talks.cam.ac.uk
CONTACT:Dr Nur Unal
DESCRIPTION:One of the appealing aspects of condensed matter physics is th
 e emergence of new collective behavior and quasiparticle excitations as a 
 consequence of interactions between particles.  This talk begins with one-
 dimensional materials\, which have long been known to support unusual meta
 llic states in which the electron spin and charge separate and travel with
  different velocities.  However\, the collective physics of even simple sy
 stems\, including the paradigmatic Heisenberg spin chain\, only became cle
 ar in the last few years: even at room temperature\, the spins form an unu
 sual quantum fluid described by the Kardar-Parisi-Zhang universality class
  familiar from soft condensed matter physics.  This prediction leads to co
 nsequences for neutron scattering experiments under reasonable conditions\
 , which were recently observed by a study of KCuF3 and also in an ultracol
 d atomic system.  A different kind of breakup or fractionalization of the 
 electron can happen in higher dimensions\, where new insight is coming fro
 m concepts and methods originating in quantum information theory.  The las
 t part of the talk discusses the renaissance of interest in interacting sp
 ins on a triangular lattice\, following on the original spin liquid idea i
 ntroduced by Anderson in 1973.  An increasing body of evidence from theory
  and experiment suggests that many competing kinds of spin liquid compete 
 on the triangular lattice\, and we discuss some recent experimental and th
 eoretical progress.
LOCATION:Small Lecture Theatre\, Cavendish Laboratory\, J.J. Thomson Avenu
 e
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