Effect of Quantum Fluctuation on Two-Dimensional Spatially Anisotropic Heisenberg Antiferromagnet with Integer Spin

作     者：JI An-Chun TIAN Guang-Shan 

作者机构：School of Physics Peking University Beijing 100871 China 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2006年第45卷第6期

页      面：1137-1146页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：The project partially supported by National Natural Science Foundation of China under Grant No. 90403003 Numerical computation of this work was carried out on the Parallel Computer Cluster of Institute for Condensed Matter Physics (ICMP) at School of Physics  Peking University 

主　　题：spatially anisotropic Heisenberg model functional integration Schwinger boson representation 

摘      要：In the present paper, we calculate the Gaussian correction to the critical value J^c⊥ caused by quantum spin fluctuation in a two-dimensional spatially anisotropic Heisenberg antiferromagnet with integer spin S. Previously, some authors computed this quantity by the mean-field theory based on the Sehwinger boson representation of spin operators. However, for S = 1, their result is much less than the one derived by numerical calculations. By taking the effect of quantum spin fluctuation into consideration, we are able to produce a greatly improved result.