论文标题
缺陷引起的边缘铁磁性和su的分数自旋激发（4）$π$ -Flux Hubbard模型在蜂窝状lattice上
Defect-induced edge ferromagnetism and fractional spin excitations of the SU(4) $π$-flux Hubbard model on honeycomb lattice
论文作者
论文摘要
最近，有人提出了SU（4）$π$ -Flux Hubbard模型，以研究$α$ -ZRCL $ _3 $ _3 $ [phys。〜ev.〜ev.〜lett的旋转轨道激发。 121.097201〜（2017）]。基于这个具有锯齿形边缘的模型，我们显示边缘缺陷会诱导边缘扁平带，从而导致SU（4）边缘铁磁磁性。我们开发有效的一维相互作用哈密顿量来研究相应的SU（4）自旋激发。值得注意的是，边缘铁磁铁的SU（4）旋转激发表现为覆盖整个能量区域而不是通常的镁元素的连续体。通过进一步的纠缠熵分析，我们建议该连续体由消失的木蛋白中的分数化旋转激发组成，除了来自粒子孔孔刺激的刺激。此外，在具有有限宽度的功能区系统中，可以在有限尺寸效应形成的间隙中恢复消失的木蛋白，并且发现已修复的木蛋白的光学分支被发现是拓扑性的。
Recently, a SU(4) $π$-flux Hubbard model on the honeycomb lattice has been proposed to study the spin-orbit excitations of $α$-ZrCl$_3$ [Phys.~Rev.~Lett. 121.097201~(2017)]. Based on this model with a zigzag edge, we show the edge defects can induce edge flat bands that result in a SU(4) edge ferromagnetism. We develop an effective one-dimensional interaction Hamiltonian to study the corresponding SU(4) spin excitations. Remarkably, SU(4) spin excitations of the edge ferromagnet appear as a continuum covering the entire energy region rather than usual magnons. Through further entanglement entropy analysis, we suggest that the continuum consists of fractionalized spin excitations from the disappeared magnons, except for that from the particle-hole Stoner excitations. Moreover, in ribbon systems with finite widths, the disappeared magnons can be restored in the gap formed by the finite-size effect and the optical branch of the restored magnons are found to be topological nontrivial.
