Delocalisation of the associated height function model rules out exponential decay of the nematic order parameter for generalized 2D XY models.
An elementary proof of phase transition in the planar xy model.Communications in Mathematical Physics, 399(1):85–104, 2023
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Phase transitions in generalized XY models
Delocalisation of the associated height function model rules out exponential decay of the nematic order parameter for generalized 2D XY models.