| 晶格量子涨落对正方晶格反铁磁海森堡模型基态的影响 |
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| 引用本文： | 苏希玉 郑杭. 晶格量子涨落对正方晶格反铁磁海森堡模型基态的影响[J]. 上海交通大学学报, 1998, 32(12): 13-16 |
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| 作者姓名： | 苏希玉 郑杭 |
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| 作者单位： | 上海交通大学应用物理系 |
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| 摘 要： | 从正方晶格反铁磁海森堡模型出发，应用正则变换方法讨论了非绝热近似下晶格量子涨落对系统基态的影响．计算结果表明，自旋－声子耦合相互作用可以使系统建立一个新的稳定基态．在此基态中，系统的能量可以得到明显的降低，而且有小的交错磁序存在．
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| 关 键 词： | 反铁磁；自旋波；自旋－声子耦合 |
Effect of Quantum Lattice Fluctuations on the Ground State of the Square Lattice Antiferromagnetic Heisenberg Model |
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| Su Xiyu,Zheng Hang. Effect of Quantum Lattice Fluctuations on the Ground State of the Square Lattice Antiferromagnetic Heisenberg Model[J]. Journal of Shanghai Jiaotong University, 1998, 32(12): 13-16 |
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| Authors: | Su Xiyu Zheng Hang |
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| Affiliation: | Su Xiyu,Zheng Hang Department of Applied Physics,Shanghai Jiaotong University,China |
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| Abstract: | Starting from the square lattice antiferromagnetic Heisenberg model, and under nonadiabatic approximation condition, this paper studies the effect of quantum lattice fluctuations on the ground state of the system by a unitary transformation method. The calculated results show that a new stable ground state can be developed on account of spin phonon coupling. In this ground state, system energy can be lowered considerably, and a small staggered magnetization can be retained. |
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| Keywords: | antiferromagnet spin wave spin phonon coupling |
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