论文标题
三角晶格上高阶拓扑的配方
Recipe for higher-order topology on the triangular lattice
论文作者
论文摘要
我们提出了三角形晶格上电子2D高阶拓扑拓扑器（HOTI）的配方，该配方可以在大型材料家族中实现。基本要素是镜像对称性的破坏，它允许有限的四极力矩和微不足道的$ \ mathbb {z} _2 $ index。旋转轨道耦合与对称性破坏术语之间的竞争会导致四个拓扑不同的阶段。当对称性破裂占主导地位时，将出现HOTI阶段，包括在没有自旋轨道耦合的情况下。我们将锌蓝/钻石类型底物（111）表面（111）表面上的三角形单层吸附物系统识别为理想的材料平台，并在SIC上预测了$ x = $（Al，b，ga）的HOTI阶段。
We present a recipe for an electronic 2D higher order topological insulator (HOTI) on the triangular lattice that can be realized in a large family of materials. The essential ingredient is mirror symmetry breaking, which allows for a finite quadrupole moment and trivial $\mathbb{Z}_2$ index. The competition between spin-orbit coupling and the symmetry breaking terms gives rise to four topologically distinct phases; the HOTI phase appears when symmetry breaking dominates, including in the absence of spin-orbit coupling. We identify triangular monolayer adsorbate systems on the (111) surface of zincblende/diamond type substrates as ideal material platforms and predict the HOTI phase for $X=$(Al,B,Ga) on SiC.
