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- W3149437462 abstract "The $S=1/2$ square-lattice $Jtext{ensuremath{-}}Q$ model hosts a deconfined quantum phase transition between antiferromagnetic and dimerized (valence-bond solid) ground states. We here study two deformations of this model---a term projecting staggered singlets, as well as a modulation of the $J$ terms forming alternating ``staircases'' of strong and weak couplings. The first deformation preserves all lattice symmetries. Using quantum Monte Carlo simulations, we show that it nevertheless introduces a second relevant field, likely by producing topological defects. The second deformation induces helical valence-bond order. Thus, we identify the deconfined quantum critical point as a multicritical Lifshitz point---the end point of the helical phase and also the end point of a line of first-order transitions. The helical-antiferromagnetic transitions form a line of generic deconfined quantum-critical points. These findings extend the scope of deconfined quantum criticality and resolve a previously inconsistent critical-exponent bound from the conformal-bootstrap method." @default.
- W3149437462 created "2021-04-13" @default.
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- W3149437462 date "2021-03-17" @default.
- W3149437462 modified "2023-09-23" @default.
- W3149437462 title "Multicritical deconfined quantum-criticality and Lifshitz point of a helical valence-bond phase" @default.
- W3149437462 hasPublicationYear "2021" @default.
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