A New Cluster Updating for 2-D SU(2)xSU(2) Chiral Model

We propose a variant version of Wolff's cluster algorithm, which may be extended to SU(N) x SU(N) chiral model, and test it in 2-dimensional SU(2) x SU(2) chiral model. The results show that the new method can efficiently reduce the critical slowing down in SU(2) x SU(2) chiral model.