Numerical tensor-network results locate a critical point at theta=pi in the 2D CP(1) model, consistent with Haldane's conjecture.
Seiberg,Topology in strong coupling,Phys
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Phase structure analysis of CP(1) model with $\theta$ term by tensor renormalization group
Numerical tensor-network results locate a critical point at theta=pi in the 2D CP(1) model, consistent with Haldane's conjecture.