Exact spontaneous plaquette ground states for high-spin ladder models

Details Exact spontaneous plaquette ground states for high-spin ladder models Exact spontaneous plaquette ground states for high-spin ladder models

2005-07-11

arxiv.org/abs/cond-mat/0507234v2

Phys. Rev. B 72, 214428 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, version to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.72.214428

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.

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