论文标题
铁磁系统中的可调SSH模型
Tunable SSH model in ferromagnetic systems
论文作者
论文摘要
众所周知，属于AIII对称类别的Su-Schrieffer-Heeger（SSH）模型的拓扑是受手性对称性的保护。在本文中，我们不是手性对称性的，而是通过磁点组对称性来限制散装哈密顿量，该对称性可以通过单位对称性和反对对称性来产生。在这些对称性下，可以将四波段模型对角线构成两个2波段模型，并且每个2波段模型都类似于SSH模型。由于两个2波段模型是个体，我们称为四波段模型双独立SSH（DISSH）模型。有趣的是，由于可以在铁磁系统中满足DISSH模型的对称要求，因此该手稿中的发现将SSH模型扩展到铁磁系统中。此外，我们提出了一个具有一组合理参数的DISSH模型的示例，以表明可以通过在实验中调整磁矩来操纵DISSH模型的拓扑阶段。
It is well known that the topology of Su-Schrieffer-Heeger(SSH) model, which belongs to AIII symmetry class, is protected by chiral symmetry. In this article, instead of chiral symmetry, we constrain the bulk Hamiltonian by a magnetic point group symmetry, which can be generated by a unitary symmetry and an anti-unitary symmetry. Under these symmetries, a four-band model can be block diagonalized into two 2-band models and each 2-band model is analogous to an SSH model. As the two 2-band models are individual, we call the four-band model double independent SSH (DISSH) model. Interestingly, since the symmetry requirements of DISSH model can be fulfilled in ferromagnetic systems, the discovery in this manuscript extends SSH model into ferromagnetic systems. Furthermore, we presented an example of DISSH model with a set of reasonable parameters to show that it is possible to manipulate the topological phase of DISSH model by tuning the magnetic moment in experiment.
