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Accepted · first revision · record

Title: Nature of the intermediate phase of the triangular-lattice Hubbard model
Plain: On a triangular lattice, between the metal at weak repulsion and the magnet at strong repulsion, there may be a quantum spin liquid, a state in which spins keep fluctuating at zero temperature.
Precise: For the half-filled triangular-lattice Hubbard model, determine whether the intermediate window found in cylinder DMRG (approximately $8.5 < U/t < 10.5$, with boundaries that depend on cylinder width) is a chiral spin liquid, a gapless spin liquid, a weakly ordered magnet, or a finite-width artifact in the two-dimensional limit. An answer is the ground-state classification (order parameters, scalar chirality, topological degeneracy) with controlled width extrapolation.
Settled by: Consistent results from DMRG on cylinders of increasing circumference and from independent two-dimensional methods for the chirality and spin order parameters.
Kind: well-posed
Answer type: classification
References: (empty)
Literature status: contested
Status note: Cylinder DMRG (2020) found a chiral spin liquid in the intermediate window; its survival in two dimensions is not established.
Posed since: (empty)