论文标题
石墨烯曲折纳米替比的拓扑边缘状态，带有自发边缘磁性
Topological edge states of a graphene zigzag nanoribbon with spontaneous edge magnetism
论文作者
论文摘要
石墨烯与自旋轨道耦合，交换场和交错式势能的拓扑阶段决定了锯齿形纳米替比的边缘状态的性质。在哈伯德相互作用的情况下，锯齿形终止的自发磁化会在散装区域的晶格位点诱导相当大的磁矩。因此，在散装区域中的交换场和交错的宣传潜力有效地改变了，这反过来改变了拓扑阶段。在某个参数状态下，存在锯齿形纳米替比的准稳定激发态，它们在锯齿形终止与基态具有不同的磁性构型。准稳定的激发态可以有效抑制拓扑边缘状态的有限尺寸效应。在存在相互作用的情况下，对拓扑边缘状态的研究有助于基于逼真的材料的自旋纳米版本的工程。
The topological phases of graphene with spin-orbit coupling, an exchange field, and a staggered-sublattice potential determine the properties of the edge states of the zigzag nanoribbon. In the presence of the Hubbard interaction, the spontaneous magnetization at the zigzag terminations induces sizable magnetic moments at the lattice sites in the bulk region. Thus, the exchange field and staggered-sublattice potential in the bulk region are effectively changed, which in turn change the topological phase. Within a certain parameter regime, quasi-stable excited states of the zigzag nanoribbon exist, which have a different magnetism configuration at the zigzag terminations from the ground state. The quasi-stable excited states could effectively suppress the finite size effect of the topological edge states. The investigation of the topological edge states in the presence of interaction helps the engineering of spintronic nanodevices based on realistic materials.
