Intermediate Haldane phase in spin-2 quantum chains with uniaxial anisotropy

Details Intermediate Haldane phase in spin-2 quantum chains with uniaxial anisotropy Intermediate Haldane phase in spin-2 quantum chains with uniaxial anisotropy

2011-07-14

arxiv.org/abs/1107.2911v2

Phys. Rev. B 84, 140407(R) (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures, references added, published version

Scientific paper

10.1103/PhysRevB.84.140407

We provide evidence of an intermediate Haldane phase in a spin-2 quantum chain. By combining effective field theory and numerical approaches, we show that the phase diagram of the proposed model includes SO(5) Haldane, intermediate Haldane, and large-D phases. We determine the characteristic properties of these phases, including edge states, string order parameters, and degeneracies in the entanglement spectrum. The symmetries responsible for the degeneracy patterns observed in the entanglement spectrum are also discussed.

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