论文标题
二维Weyl SSH模型中的拓扑超导性
Topological Superconductivity in a two-dimensional Weyl SSH model
论文作者
论文摘要
我们研究了由二维（2D）Weyl系统中拓扑超导的出现，该系统由堆叠的Su-Schrieffer-Heeger（SSH）链组成。对该模型的先前分析表明，跨性电子之间的添加有吸引力的哈伯德相互作用导致具有复杂的配对结构的超导状态，但在拓扑上是微不足道的。在这里，我们考虑了一种配对相互作用，该相互作用将无旋转的fermions融合在同一单位单元格内的相对sublattices上。我们观察到，这种具有物理动机的，动量独立的配对相互作用会诱导拓扑超导状态，其特征是具有非平凡相的间隙函数，以及沿着垂直于SSH Dimerization方向的边缘的Majorana和Majorana和Fermi Arc Edge状态。此外，我们观察到一个过渡是配对相互作用强度和化学潜力的函数，这是由四个Bogoliubov-weyl节点中每个节点携带的拓扑电荷的变化所表明的。
We study the emergence of topological superconductivity in a two-dimensional (2D) Weyl system, composed of stacked Su-Schrieffer-Heeger (SSH) chains. A previous analysis of the model showed that the addition of an attractive Hubbard interaction between spinful electrons leads to a superconducting state that has an intricate pairing structure, but is topologically trivial. Here we consider a pairing interaction that couples spinless fermions on opposite sublattices within the same unit cell. We observe that this physically motivated, momentum-independent pairing interaction induces a topological superconducting state, characterized by a gap function with a non-trivial phase, as well as Majorana and Fermi arc edge states along the edge perpendicular to the direction of the SSH dimerization. In addition, we observe a transition as a function of pairing interaction strength and chemical potential, indicated by a change in the sign of the topological charge carried by each of the four Bogoliubov-Weyl nodes.
