论文标题
在四分之一的一维亲块晶格模型中耦合二聚体和债券订购订单
Coupled dimer and bond-order-wave order in the quarter-filled one-dimensional Kondo lattice model
论文作者
论文摘要
在有机化合物$（per）_ {2} [pt（mnt）_ {2}] $的实验中，我们研究了季度填充一维近相关晶格模型的基态，并使用密度矩阵肾脏重新分配组方法进行填充。我们分别在局部旋转和巡回电子的弱耦合方面显示了一个耦合的二聚体和键级波（BOW）状态。二聚体的量子相变和弓订单以相同的关键耦合参数$ j_ {c} $发生，并在打开电荷间隙的情况下出现。二聚体和弓秩序的组合的出现与低温下同时的PEIERL和自旋peierls跃迁的实验发现一致，这提供了对这种相变的理论理解。我们还表明，在这种绝缘状态下的局部旋转具有与共线构型的准范围远程自旋相关性，在没有磁性顺序的情况下类似于经典的二聚体顺序。
Motivated by the experiments on the organic compound $(Per)_{2}[Pt(mnt)_{2}]$, we study the ground state of the one-dimensional Kondo lattice model at quarter filling with the density matrix renormalization group method. We show a coupled dimer and bond-order-wave (BOW) state in the weak coupling regime for the localized spins and itinerant electrons, respectively. The quantum phase transitions for the dimer and the BOW orders occur at the same critical coupling parameter $J_{c}$, with the opening of a charge gap. The emergence of the combination of dimer and BOW order agrees with the experimental findings of the simultaneous Peierls and spin-Peierls transitions at low temperatures, which provides a theoretical understanding of such phase transition. We also show that the localized spins in this insulating state have quasi-long ranged spin correlations with collinear configurations, which resemble the classical dimer order in the absence of a magnetic order.
