Hidden orders and phase transitions for the fully packed quantum loop model on the triangular lattice

Abstract

Quantum loop and dimer models are prototypical correlated systems with local constraints, which are not only intimately connected to lattice gauge theories and topological orders but are also widely applicable to the broad research areas of quantum materials and quantum simulation. Employing our sweeping cluster quantum Monte Carlo algorithm, we reveal the complete phase diagram of the triangular-lattice fully packed quantum loop model. Apart from the known lattice nematic (LN) solid and the even ${\mathbb{Z}}_2$ quantum spin liquid (QSL) phases, we discover a hidden vison plaquette (VP) phase, which had been overlooked and misinterpreted as a QSL for more than a decade. Moreover, the VP-to-QSL continuous transition belongs to the $(2+1)$D cubic* universality class, which offers a lattice realization of the (fractionalized) cubic fixed point that had long been considered as irrelevant towards the O($3$) symmetry until corrected recently by conformal bootstrap calculations. Our results are therefore of relevance to recent developments in both experiments and theory, and facilitate further investigations of hidden phases and transitions.

11+7 pages, 6+5 figures

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• Symmetrizing the Constraints -- Density Matrix Renormalization Group for Constrained Lattice Models
• Trivalent network model for d${}^3$ transition metal dichalcogenides in the 1T structure: Holography from local constraints
• Doped resonating-valence-bond states: Robustness of the spin-ice phases in three-dimensional Rydberg arrays