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  4. First-order Neel to columnar valence bond solid transition in a model square-lattice S=1 antiferromagnet
 
research article

First-order Neel to columnar valence bond solid transition in a model square-lattice S=1 antiferromagnet

Wildeboer, Julia
•
Desai, Nisheeta
•
D'Emidio, Jonathan  
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January 13, 2020
Physical Review B

We study the Neel to fourfold columnar valence bond solid (cVBS) quantum phase transition in a sign-free S = 1 square-lattice model. This is the same kind of transition that for S = 1/2 has been argued to realize the prototypical deconfined critical point. Extensive numerical simulations of the square-lattice S = 1/2 Neel-VBS transition have found consistency with the deconfined critical point scenario with no direct evidence for first-order behavior. In contrast to the S = 1/2 case, in our quantum Monte Carlo simulations for the S = 1 model, we present unambiguous evidence for a direct conventional first-order quantum phase transition. Classic signs of a first-order transition demonstrating coexistence including double-peaked histograms and switching behavior are observed. The sharp contrast from the S = 1/2 case is remarkable; we hypothesize that this is a striking demonstration of the role of the size of the quantum spin in the phase diagram of two-dimensional lattice models.

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Type
research article
DOI
10.1103/PhysRevB.101.045111
Web of Science ID

WOS:000506845000005

Author(s)
Wildeboer, Julia
Desai, Nisheeta
D'Emidio, Jonathan  
Kaul, Ribhu K.
Date Issued

2020-01-13

Publisher

AMER PHYSICAL SOC

Published in
Physical Review B
Volume

101

Issue

4

Article Number

045111

Subjects

Materials Science, Multidisciplinary

•

Physics, Applied

•

Physics, Condensed Matter

•

Materials Science

•

Physics

•

spin

•

algorithms

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CTMC  
Available on Infoscience
March 3, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/166708
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