二维经典XY模型在三角形和正方形格子上高温展开式的进一步推广
Further extensions of the high-temperature expansions for the two-dimensional classical XY model on the triangular and the square lattices
摘要：
将二维经典XY（planar rotator）模型的自旋-自旋关联函数的高温展开式在正方形晶格的情况下从24阶扩展到26阶，在三角形晶格的情况下从15阶扩展到20阶.对数据进行了分析，以改进模型关键参数的当前估计。
英文摘要：
The high-temperature expansions for the spin-spin correlation function of the two-dimensional classical XY (planar rotator) model are extended by two terms, from order 24 through order 26, in the case of the square lattice, and by five terms, from order 15 through order 20, in the case of the triangular lattice. The data are analyzed to improve the current estimates of the critical parameters of the models.
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