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SUMMARY:Quantum Melting of Spin 'Solids' in 2D - Andriy Nevidomskyy (Rice 
 University)
DTSTART:20231116T140000Z
DTEND:20231116T150000Z
UID:TALK204322@talks.cam.ac.uk
CONTACT:Bo Peng
DESCRIPTION:For several decades\, the attention of both theoretical and ex
 perimental physicists has focused on finding examples of quantum spin liqu
 ids (QSL) — exotic phases of matter characterized by the spin fractional
 ization\, whereby the energy and momentum are carried not by spin waves\, 
 but by emergent elementary excitations. By contrast\, defining a quantum s
 pin 'solid' as a state that spontaneously breaks the lattice translation s
 ymmetry\, I shall pose the following question — how do quantum solids 'm
 elt' and how does entanglement establish itself in a QSL? To answer this q
 uestion\, I shall present our recent work on several 2D systems\, from the
  familiar spin-1/2 on frustrated lattices\, to the perhaps less familiar m
 odels of spin-1 and SU(3) objects. We study these models using the density
  matrix renormalization group (DMRG) and infinite projected entangled-pair
  states (iPEPS) techniques\, supplemented by the analytical mean-field and
  linear flavor wave theory calculations. I shall also discuss another mech
 anism of quantum 'melting'\, induced by a strong magnetic field — the co
 nventional picture is that this process can be understood as a Bose-Einste
 in condensation of the auxiliary bosons. Here we show that a more exotic\,
  non-BEC transition occurs when magnetic frustration drives the system acr
 oss the Lifshitz point\, and we find an exotic bosonic liquid that avoids 
 the BEC altogether — so-called Bose metal with algebraic correlations.
LOCATION:TCM Seminar Room
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