What is the critical temperature for a BKT transition in the 2D quantum XY model with $S=1$ (not $S=1/2$)? For instance, the classical XY model has KTc/J = 0.898 and the quantum XY model with S=1/2 has KTc/J = .350.
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$\begingroup$ Did you ever learn what the critical temperature was? $\endgroup$– user196574Commented Jun 16, 2023 at 20:59
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