Ground state phase diagram of a spin-2 antiferromagnet on the square lattice
Ground state phase diagram of a spin-2 antiferromagnet on the square lattice
复制标题
方晶格上自旋 2 反铁磁体的基态相图
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
J. Zittartz
中科院分区：
文献类型：
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作者：
H. Niggemann;A. Klümper;J. Zittartz
翻译后摘要：我们使用的顶点状态模型的方法来构建最佳基态的一个大类的量子自旋2反铁磁体的正方形晶格。最佳基态是模型的精确基态，使所有局部相互作用算子最小化。基态包含两个连续的参数，并表现出从无序相与指数衰减的相关函数的Néel有序相的二阶相变。的行为是非常相似的相应的基态的量子自旋-3/2模型的六方晶格，这已经在较早的文件中进行了研究。
Abstract:We use the vertex state model approach to construct optimum ground states for a large class of quantum spin-2 antiferromagnets on the square lattice. Optimum ground states are exact ground states of the model which minimize all local interaction operators. The ground state contains two continuous parameters and exhibits a second order phase transition from a disordered phase with exponentially decaying correlation functions to a Néel ordered phase. The behaviour is very similar to that of the corresponding ground state of a quantum spin-3/2 model on the hexagonal lattice, which has been investigated in an earlier paper.