Anisotropic 2D Ising model#184
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VictorVanthilt merged 6 commits intoJun 8, 2026
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VictorVanthilt
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Jun 8, 2026
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Thanks for this addition. How do you want to proceed on getting the cft data calculation to work with anisotropic networks? |
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I'm currently doing some tests, and hopefully a new PR on that is coming soon. |
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This PR adds the anisotropic version of the classical 2D Ising model. The coupling
Jxfor x-bonds andJyfor y-bonds can be different.@dartsushi and @GlebFedorovich noticed that current CFT data calculation does not work for the anisotropic case, because it implicitly assumes that the space-time patch covered by one tensor is square (modular parameter is i). As a result, the central charge and scaling dimensions show a period-4 oscillation.
In general, the modular parameter should be extracted from several different 2 x 2 transfer matrices with different orientations (horizontal, vertical and two diagonals; see Appendix 2 of https://arxiv.org/abs/0903.1069). Thus this model can serve as the benchmark for non-square modular parameters.