论文标题
磁性底物上的铅烯：STM和DFT组合
Plumbene on a magnetic substrate: a combined STM and DFT study
论文作者
论文摘要
作为石墨烯的重型类似物，铅烯是一种具有较强自旋轨道耦合效应的二维材料。使用扫描隧道显微镜（STM），我们观察到PB在IR上的Fe单层上形成了平坦的蜂窝晶格（111）。相反，在没有Fe层的情况下，发现了IR（111）上Pb的C（2x4）结构。我们使用密度功能理论（DFT）计算来合理化这些发现并分析杂交对铅烯带结构的影响。在空置状态下，在自旋轨道相互作用的情况下，在独立式铅烯的占用状态下清楚地观察到了狄拉克锥的分裂，我们发现带来的带反转，导致形成拓扑上的非平常间隙。通过强大的杂交与FE层介导的交换分裂驱动量子自旋大厅以量子异常状态状态过渡。
As heavy analog of graphene, plumbene is a two-dimensional material with strong spin-orbit coupling effects. Using scanning tunneling microscopy (STM), we observe that Pb forms a flat honeycomb lattice on an Fe monolayer on Ir(111). In contrast, without the Fe layer, a c(2x4) structure of Pb on Ir(111) is found. We use density functional theory (DFT) calculations to rationalize these findings and analyze the impact of the hybridization on the plumbene band structure. In the unoccupied states the splitting of the Dirac cone by spin-orbit interaction is clearly observed while in the occupied states of the freestanding plumbene we find a band inversion that leads to the formation of a topologically non-trivial gap. Exchange splitting as mediated by the strong hybridization with the Fe layer drives a quantum spin Hall to quantum anomalous Hall state transition.
