Two coupled frustrated Haldane chains show an extended Ashkin-Teller quantum phase transition separating a plaquette phase from a uniform disordered phase, with connections to Haldane and dimerized phases via Gaussian and Ising transitions.
Xian, Exact results of dimerization order parameter in SU (n) antiferromagnetic chains, Physics Letters A183, 437 (1993)
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Extended Ashkin-Teller transition in two coupled frustrated Haldane chains
Two coupled frustrated Haldane chains show an extended Ashkin-Teller quantum phase transition separating a plaquette phase from a uniform disordered phase, with connections to Haldane and dimerized phases via Gaussian and Ising transitions.