论文标题
具有各向异性Weyl点连通性的高阶Weyl超导体
Higher-order Weyl superconductors with anisotropic Weyl-point connectivity
论文作者
论文摘要
Weyl超导体在三维（3D）Brillouin区域中具有零能量的Weyl点，并且将这些Weyl点的投影连接在表面上。我们报告说，高阶Weyl超导体可以在奇数拓扑超导体中实现，而定期驾驶会破坏时间反转对称性。与常规的Weyl点不同，散装单独的2D一阶和二阶拓扑阶段中的高阶Weyl点，而在表面上，它们的投影不仅是由常规的表面Majorana弧线连接的，而且还通过Hinge Majora Majorana Arcs连接。我们表明，通过Majorana弧的Weyl点连通性在很大程度上由潜在的高阶拓扑结构丰富，并且在表面方向方面变为各向异性。我们将各向异性的Weyl点连通性确定为高阶Weyl材料的特征。由于可以通过固定周期性驾驶来挑选每个2D子系统，因此我们建议如何在实验中检测和操纵2D高阶拓扑阶段中的Majorana零模式。
Weyl superconductors feature Weyl points at zero energy in the three-dimensional (3D) Brillouin zone and arc states that connect the projections of these Weyl points on the surface. We report that higher-order Weyl superconductors can be realized in odd-parity topological superconductors with time-reversal symmetry being broken by periodic driving. Different from conventional Weyl points, the higher-order Weyl points in the bulk separate 2D first- and second-order topological phases, while on the surface, their projections are connected not only by conventional surface Majorana arcs, but also by hinge Majorana arcs. We show that the Weyl-point connectivity via Majorana arcs is largely enriched by the underlying higher-order topology and becomes anisotropic with respect to surface orientations. We identify the anisotropic Weyl-point connectivity as a characteristic feature of higher-order Weyl materials. As each 2D subsystem can be singled out by fixing the periodic driving, we propose how the Majorana zero modes in the 2D higher-order topological phases can be detected and manipulated in experiments.
