Dynamic Monte Carlo Study of the Two-Dimensional Quantum XY Model
  We present a dynamic Monte Carlo study of the Kosterlitz-Thouless phase transition for the spin-1/2 quantum XY model in two dimensions. The short-time dynamic scaling behaviour is found and the dynamical exponent $\theta$, $z$ and the static exponent $\eta$ are determined at the transition temperature. 
H.P. Ying (Hangzhou), H.J. Luo, L. Schuelke (Siegen), B. Zheng (Halle)