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.
However, due to strong finite size effects, direct numerical verification of this expectation is currently unfeasible
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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.