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 intra-layer coupling J2 is ferromagnetic while the inter-layer one J1 is ferromagnetic in one direction of the lattice and anti-ferromagnetic in the other one
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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.