论文标题
二阶拓扑超导体的浮标生成
Floquet generation of Second Order Topological Superconductor
论文作者
论文摘要
我们从理论上研究了二阶拓扑超导的Floquet生成（SOTSC）阶段，托管Majoraana Corner模式（MCMS），考虑到具有接近性的超导导向$ s $ s $ -Wave配对的量子自旋霍尔绝缘子（QSHI）。我们的动态处方包括在时间交流对称性中打破平面内磁场和四倍旋转对称性断裂质量项的周期性启动，而这些Floquet MCMS则由反对的颗粒孔对称性保留。第一个驾驶协议始终导致四个零能量MCM（即每个角落一个Majorana），作为{\ it {strong}} SOTSC阶段的标志。有趣的是，第二个协议还可以导致{\ it {feal}} sotsc阶段，除了{\ it {strong}} sotsc阶段外，还具有八个零能量mcms（每个角度的两个主要状态）。我们通过Floquet Quadrupolar矩和Floquet Wannier光谱来表征这些阶段的拓扑性质。我们认为，依靠驱动系统的最新实验进步和接近性引起的超导性，我们的方案将来可能会在未来进行测试。
We theoretically investigate the Floquet generation of second-order topological superconducting (SOTSC) phase, hosting Majorana corner modes (MCMs), considering a quantum spin Hall insulator (QSHI) with proximity induced superconducting $s$-wave pairing in it. Our dynamical prescription consists of the periodic kick in time-reversal symmetry breaking in-plane magnetic field and four-fold rotational symmetry breaking mass term while these Floquet MCMs are preserved by anti-unitary particle-hole symmetry. The first driving protocol always leads to four zero energy MCMs (i.e. one Majorana per corner) as a sign of a {\it{strong}} SOTSC phase. Interestingly, the second protocol can result in a {\it{weak}} SOTSC phase, harbouring eight zero energy MCMs (two Majorana states per corner), in addition to the {\it{strong}} SOTSC phase. We characterize the topological nature of these phases by Floquet quadrupolar moment and Floquet Wannier spectrum. We believe that relying on the recent experimental advancement in the driven systems and proximity induced superconductivity, our schemes may be possible to test in the future.
