Exact spontaneous plaquette ground states for high-spin ladder models
arXiv:cond-mat/0507234 · doi:10.1103/PhysRevB.72.214428
Abstract
We study the exchange physics in high spin Mott insulating systems with which is realizable in ultracold atomic systems. The high symmetry of SO(5) or SU(4) therein renders stronger quantum fluctuations than the usual spin-1/2 systems. A spontaneous plaquette ground state without any site and bond spin orders is rigorously proved in a ladder spin-3/2 model, whose topological excitations exhibit fractionalization behavior. The generalization to the SU(N) plaquette state is also investigated.
4 pages, 3 figures, version to be published in Phys. Rev. B
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