Proximity-induced Majorana hinge modes in antiferromagnetic topological insulators
Proximity-induced Majorana hinge modes in antiferromagnetic topological insulators
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DOI：
10.1103/physrevb.99.195431
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发表时间：
2018-09
影响因子：
3.7
通讯作者：
Yang Peng;Yong Xu
中科院分区：
文献类型：
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作者：
Yang Peng;Yong Xu
我们提出了在三维反铁磁拓扑绝缘体铰链上传播的手性Majorana模式的实现，该模式最近在四钇型mnbi_2te_4相关三元chalgogenides中得到了理论预测和实验证实。这些材料由铁磁有序的二维层组成，其磁化方向在相邻层之间交替，形成反铁磁有序。除了具有磁隙的表面外，还存在具有单个狄拉克锥的无隙表面，当接近耦合到s波超导体时，该无隙表面可以被击穿。在两种类型的间隙表面的共享边缘上，出现了手性Majorana模式。我们进一步提出了这些马约拉纳铰链模式的实验签名在两端电导测量。
We propose a realization of chiral Majorana modes propagating on the hinges of a 3D antiferromagnetic topological insulator, which was recently theoretically predicted and experimentally confirmed in the tetradymite-type MnBi_2Te_4-related ternary chalgogenides. These materials consist of ferromagnetically ordered 2D layers, whose magnetization direction alternates between neighboring layers, forming an antiferromagnetic order. Besides surfaces with a magnetic gap, there also exist gapless surfaces with a single Dirac cone, which can be gapped out when proximity coupled to an s-wave superconductor. On the sharing edges between the two types of gapped surfaces, the chiral Majorana modes emerge. We further propose experimental signatures of these Majoana hinge modes in terms of two-terminal conductance measurements.