论文标题
高阶拓扑状态由$ d $ - 波竞争的订单在High-T $ _C $基于超导体的异质结构中
Higher order topological state induced by $d$-wave competing orders in high-T$_c$ superconductor based heterostructure
论文作者
论文摘要
我们引入了一个二维Chern绝缘子，以靠近高t $ _C $超导材料的$ d $ - 波伪pseudogap状态，作为实现高阶拓扑系统的有效平台。 Chern绝缘子层中接近诱导的$ D $ - 密度波（DDW）订单是有效的质量。边缘状态将被此DDW订单完全掩盖。在真实空间中，由于$ d $波的因子，DDW订单参数的符号在系统角变化，导致无间隙角状态，表明该系统可能处于更高的拓扑状态。基于边缘极化和四极力矩的计算，确认了该耦合系统中的高阶拓扑。在超导状态下，超导顺序和DDW秩序并存，Majorana角出现了。
We introduce a two-dimensional Chern insulator in proximity to a $d$-wave pseudogap state of the high-T$_c$ superconducting material as an effective platform to realize the higher order topological system. The proximity-induced $d$-density-wave (DDW) order in the Chern insulator layer serves as an effective mass. The edge states will be fully gapped by this DDW order. In the real space, the sign of the DDW order parameter changes at the system corners due to the $d$-wave factor, leading to the gapless corner states, indicating that this system may be in a higher order topological state. The higher order topology in this coupled system is confirmed based on the calculation of the edge polarization and the quadrupole moment. In the superconducting state where the superconducting order and the DDW order coexist, the Majorana corner states emerge.
