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Persistence of BKT phase transition in the 2D nonanalytic XY model
We study the two-dimensional XY model with the nonanalytic pair potential $2[(1-\cosδ)/2]^{p}$, whose small-angle law $\propto|δ|^{2p}$ carries a cusp for $p1$, invalidating the harmonic spin-wave expansion. Two questions arise: the nature of the low-temperature ($T$) ph
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