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| 自旋1/2的二维反铁磁Heisenberg模型的格林函数理论 | |
| 引用本文： | 仲崇贵,赵永林,施建珍. 自旋1/2的二维反铁磁Heisenberg模型的格林函数理论[J]. 南通大学学报(自然科学版), 2006, 5(4): 9-11 |
| 作者姓名： | 仲崇贵 赵永林 施建珍 |
| 作者单位： | 南通大学,理学院,江苏,南通,226007;南通大学,理学院,江苏,南通,226007;南通大学,理学院,江苏,南通,226007 |
| 基金项目： | 江苏省高校自然科学基金 |
| 摘 要： | 采用双时格林函数理论讨论了二维反铁磁Heisenberg模型的热力学性质.将自旋算符的关联函数在Tyab-likov近似下进行退耦,得到关联函数的自洽方程,从而研究了相变温度下自旋交错磁化的激发情况,求出了系统的平均能量,并将基态的情况与对应的数值模拟结果进行了比较. |
| 关 键 词： | 海森堡模型 双时格林函数 交错磁化 关联 |
| 文章编号： | 1673-2340（2006）04-0009-03 |
| 收稿时间： | 2006-03-22 |
| 修稿时间： | 2006-03-22 |
Green's Function Theory of the Two-dimensional Antiferromagnetic Heisenberg Model with Spin |
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| ZHONG Chong-gui,ZHAO Yong-lin,SHI Jian-zhen. Green's Function Theory of the Two-dimensional Antiferromagnetic Heisenberg Model with Spin[J]. Journal of Nantong University (Natural Science Edition), 2006, 5(4): 9-11 | |
| Authors: | ZHONG Chong-gui ZHAO Yong-lin SHI Jian-zhen |
| Abstract: | The thermodynamic properties of the two dimensional antiferromagnetic Heisenberg model are studied in the framework of two-time Green's function theory.With the Tyablibov approximation,the Green's function is decoupled in terms of the correlation functions of spin operators,from which a set of self-consistent equations of the correlation functions are derived.And then,temperature dependence of the magnetization,average energy of the system,and correlation between the nextest neighbors are obtained. |
| Keywords: | Heisenberg model Green's function method Magnetization Correlation |
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