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- W4385328118 abstract "Berry phase interference arguments that underlie the theory of deconfined quantum criticality (DQC) for spin-$frac{1}{2}$ antiferromagnets have also been invoked to allow for continuous transitions in spin-1 magnets including a N'eel to (columnar) valence bond solid (cVBS) transition. We provide a microscopic model realization of this transition on the square lattice consisting of Heisenberg exchange ($J_H$) and biquadratic exchange ($J_B$) that favor a N'eel phase, and a designed $Q$-term ($Q_B$) interaction which favors a cVBS through large-scale quantum Monte Carlo (QMC) simulations. For $J_H=0$, this model is equivalent to the $SU(3)$ $JQ$ model with a N'eel-cVBS transition that has been argued to be DQC through QMC. Upon turning on $J_H$ which brings down the symmetry to $SU(2)$, we find multiple signatures -- a single critical point, high quality collapse of correlation ratios and order parameters, $U(1)$-symmetric cVBS histograms and lack of double-peak in order parameter histograms for largest sizes studied near the critical point -- that are highly suggestive of a continuous transition scenario. However, Binder analysis finds negative dips that grow sub-extensively that we interpret as these transitions rather being pseudocritical. This along with recent results on spin-$frac{1}{2}$ models suggests that deconfined pseudocriticality is the more generic scenario." @default.
- W4385328118 created "2023-07-28" @default.
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- W4385328118 date "2023-07-26" @default.
- W4385328118 modified "2023-09-27" @default.
- W4385328118 title "Deconfined pseudocriticality in a model spin-1 quantum antiferromagnet" @default.
- W4385328118 doi "https://doi.org/10.48550/arxiv.2307.14254" @default.
- W4385328118 hasPublicationYear "2023" @default.
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