Phys. Rev. B 72, 214428 (2005) [4 pages]Exact spontaneous plaquette ground states for high-spin ladder modelsReceived 9 July 2005; published 15 December 2005 We study the exchange physics in high-spin Mott insulating systems with S=3∕2 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.214428
DOI:
10.1103/PhysRevB.72.214428
PACS:
75.10.Jm
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