Increasing the effective interaction range in the 2D Su-Schrieffer-Heeger model changes the VBS-to-AFM transition from a deconfined quantum critical point to a strongly first-order transition, for both O(4) and SO(4) symmetric variants.
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Tuning the order of a deconfined quantum critical point
Increasing the effective interaction range in the 2D Su-Schrieffer-Heeger model changes the VBS-to-AFM transition from a deconfined quantum critical point to a strongly first-order transition, for both O(4) and SO(4) symmetric variants.