论文标题
量子自旋链中的野外诱导二聚体顺序
Field-induced dimer orders in quantum spin chains
论文作者
论文摘要
量子自旋链中的场诱导的激发差距是与拓扑激发限制有关的有趣现象。在本文中，我提出了这种现象的新型类型。我表明，具有四倍螺钉对称性的有效磁场会引起激发差距，并伴随着二聚体顺序。间隙和二聚体订单诱导的，因此对四倍螺钉对称场表现出特征性的幂律依赖性。此外，当应用外部均匀磁场，四倍螺钉对称场和双重交错场时，场诱导的二聚体顺序和磁场诱导的néel顺序并存。这种情况与化合物[Cu（Pym）（H $ _2 $ O）$ _ 4 $] SIF $ _6 $ [J。 Liu等人，物理。莱特牧师。 122，057207（2019）]。在本文中，我通过使用密度 - 矩阵重质化组方法，扰动理论和量子场理论来讨论场诱导的二聚体顺序的机制。
Field-induced excitation gaps in quantum spin chains are an interesting phenomenon related to confinements of topological excitations. In this paper, I present a novel type of this phenomenon. I show that an effective magnetic field with a fourfold screw symmetry induces the excitation gap accompanied by dimer orders. The gap and dimer orders induced so exhibit characteristic power-law dependence on the fourfold screw-symmetric field. Moreover, the field-induced dimer order and the field-induced Néel order coexist when the external uniform magnetic field, the fourfold screw-symmetric field, and the twofold staggered field are applied. This situation is in close connection with a compound [Cu(pym)(H$_2$O)$_4$]SiF$_6$ [J. Liu et al., Phys. Rev. Lett. 122, 057207 (2019)]. In this paper, I discuss a mechanism of field-induced dimer orders by using a density-matrix renormalization group method, a perturbation theory, and quantum field theories.
