Phase diagram of the spin-1/2 easy-axis triangular-lattice J1-J2 model

Motivated by recent interest in rare-earth and transition-metal compounds that exhibit strong quantum fluctuations and broad spin excitation continua, we present a comprehensive study of the model that describes these materials. Combining density-matrix renormalization group simulations with analytical insights, we investigate the phase diagram of the spin-1/2 easy-axis triangular-lattice J1-J2 model. Our results provide compelling evidence for a remarkably persistent spin-liquid phase stabilized between the supersolid Y phase and the collinear stripe phase. Despite the Ising anisotropy of the model, the spin-spin correlations in the spin-liquid phase appear nearly SU(2)-symmetric, indicating a surprising resilience of this phase to the explicit spin-rotation symmetry breaking in the model and suggesting an emergent symmetry enhancement. We also analyzed the supersolid Y phase, providing quantitative characterization of its order parameters and offering an explanation to the surprising absence of the ferromagnetic moment in it, with both results relevant to recent experiments in Ising-like triangular-lattice magnets.