Exact Ground States of the Extended Hubbard Model on the Kagome lattice
Exact Ground States of the Extended Hubbard Model on the Kagome lattice
复制标题
Kagome 晶格上扩展哈伯德模型的精确基态
DOI：
10.1140/epjb/e2018-90352-9
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Satoshi Nishimoto
中科院分区：
文献类型：
--
作者：
Masaaki Nakamura;Satoshi Nishimoto
通过将哈密顿量构造为上下自旋扇区投影算子的积和，讨论了几种填充情况下kagom<e:1>格上广义Hubbard模型的确切斑块序基态。得到的精确基态被解释为键位电子上的nsamel有序态。我们确定了精确基态的几个参数区域，并计算了纠缠熵。我们通过基于精确对角化和密度矩阵重整化群方法的数值计算来检验上述结果。
We discuss the exact plaquette-ordered ground states of the generalized Hubbard model on the Kagomé lattice for several fillings, by constructing the Hamiltonian as a sum of products of projection operators for up and down spin sectors. The obtained exact ground states are interpreted as Néel ordered states on the bond-located electrons. We determine several parameter regions of the exact ground states, and calculate the entanglement entropy. We examine the above results by numerical calculations based on exact diagonalization and density-matrix renormalization group methods.