作者:H. Niggemann、A. Klümper、J. Zittartz
DOI:10.1007/s100510050004
日期:2000.1
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
我们使用顶点状态模型方法为方格上的一大类量子自旋2反铁磁体构造最佳基态。最佳基态是模型的精确基态,可将所有本地交互算子最小化。基态包含两个连续的参数,并且呈现出从具有指数衰减的相关函数的无序相到Néel有序相的二阶相变。该行为与六角晶格上的量子自旋3/2模型的相应基态的行为非常相似,后者已在较早的论文中进行了研究。