论文标题
超导狄拉克材料中的手性majoraga铰链模式
Chiral Majorana Hinge Modes in Superconducting Dirac Materials
论文作者
论文摘要
手性马关系铰链模式是三维中二阶拓扑超导体的特征。在这里，我们在点组d_ {2h}中系统地研究配对对称性，并发现领先的配对通道可以是dirac材料中的S-，D-和S+ID波配对。除了奇数S波配对超导率外，S+ID波配对超导体在拓扑上是非平地的，并且具有Majoraana铰链和表面模式。手性马匹铰链模式的特征是绕线数的四极力矩，或在对称不变点处量化四倍矩。我们的发现表明，在狄拉克材料中具有强的自旋 - 轨道耦合，结晶对称性和电子 - 电子相互作用可能会提供微观机制，以实现手性majoragara铰链模式，而无需使用接近效应或外部磁场。
Chiral Majorana hinge modes are characteristic of a second-order topological superconductor in three dimensions. Here we systematically study pairing symmetry in the point group D_{2h}, and find that the leading pairing channels can be of s-, d-, and s+id-wave pairing in Dirac materials. Except for the odd-parity s-wave pairing superconductivity, the s+id-wave pairing superconductor is topologically nontrivial and possesses Majorana hinge and surface modes. The chiral Majorana hinge modes can be characterized by a winding number of the quadrupole moment, or quantized quadruple moment at the symmetrically invariant point. Our findings suggest the strong spin-orbital coupling, crystalline symmetries and electron-electron interaction in the Dirac materials may provide a microscopic mechanism to realize chiral Majorana hinge modes without utilizing the proximity effect or external fields.
