论文标题
拓扑金属1T $^\ prime $ -mote $ _2 $中的高阶拓扑超导性
Higher-order topological superconductivity in a topological metal 1T$^\prime$-MoTe$_2$
论文作者
论文摘要
拓扑超导性（TSC）领域中的一个关键挑战是材料实现的稀有性。这不仅是具有Majorana表面模式的一阶TSC，还适用于具有Majorana Hinge和Corner模式的高阶TSC。在这里，我们提出了一种四步策略，该策略在数学上得出了一般高阶TSC阶段材料的搜索和设计综合指导原则。具体而言，此类食谱包括正常状态和配对对称性的条件，这些条件可能导致给定的高阶TSC状态。我们通过获取获得由反转对称性保护的三维高阶TSC相的食谱来证明这种策略。遵循食谱后，我们预测中心对称MOTE $ _2 $中观察到的超导性是具有角模式的高阶TSC的候选者。我们提出的策略可以实现高阶TSC的系统材料搜索和设计，这可以动员实验工作并加速材料发现以获得高阶TSC阶段。
One key challenge in the field of topological superconductivity (Tsc) has been the rareness of material realization. This is true not only for the first-order Tsc featuring Majorana surface modes, but also for the higher-order Tsc, which host Majorana hinge and corner modes. Here, we propose a four-step strategy that mathematically derives comprehensive guiding principles for the search and design for materials of general higher-order Tsc phases. Specifically, such recipes consist of conditions on the normal state and pairing symmetry that can lead to a given higher-order Tsc state. We demonstrate this strategy by obtaining recipes for achieving three-dimensional higher-order Tsc phases protected by the inversion symmetry. Following our recipe, we predict that the observed superconductivity in centrosymmetric MoTe$_2$ is a candidate for higher-order Tsc with corner modes. Our proposed strategy enables systematic materials search and design for higher-order Tsc, which can mobilize the experimental efforts and accelerate the material discovery for higher-order Tsc phases.
