In the frustrated two-layer Ising model the two-fold degeneracy of surface magnetic scaling dimensions from the Ashkin-Teller class is lifted, producing distinct values x1^s and x2^s related by the duality x1^s = (1/4) x2^s.
The Ashkin-Teller model The classical Ashkin-Teller model corresponds to two Ising replicas, denoted σA and σB in the following, coupled by their local energy
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Tensor Renormalization-Group study of the surface critical behavior of a frustrated two-layer Ising model
In the frustrated two-layer Ising model the two-fold degeneracy of surface magnetic scaling dimensions from the Ashkin-Teller class is lifted, producing distinct values x1^s and x2^s related by the duality x1^s = (1/4) x2^s.