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Kosterlitz-Thouless Transition of Quantum<i><i>X</i><i>Y</i></i>Model in Two Dimensions
The two-dimensional S =1/2 X Y model is investigated with an extensive quantum Monte Carlo simulation. The helicity modulus is precisely estimated through a continuous-time loop algorithm for systems up to 128 ×128 near and below the critical temperature. The critical temperature is estimated as T KT = 0.3427(2) J …