In-Plane Zeeman-Field-Induced Majorana Corner and Hinge Modes in an s-Wave Superconductor Heterostructure.
In-Plane Zeeman-Field-Induced Majorana Corner and Hinge Modes in an s-Wave Superconductor Heterostructure.
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DOI：
10.1103/physrevlett.124.227001
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发表时间：
2019-05
影响因子：
8.6
通讯作者：
Yajie Wu;Junpeng Hou;Yunmei Li;Xiwang Luo;Xiaoyan Shi;Chuanwei Zhang
中科院分区：
文献类型：
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作者：
Yajie Wu;Junpeng Hou;Yunmei Li;Xiwang Luo;Xiaoyan Shi;Chuanwei Zhang
与传统的二维和三维边缘和表面模式相比，二阶拓扑超导体具有马约拉纳角模式和铰链模式。然而，这种二阶角模的实现通常需要非常规的超导配对或复杂的结或层状结构。在这里，我们证明了利用二维量子自旋霍尔绝缘体与s波超导体近距离接触并受到面内塞曼场的影响，可以实现马约拉纳角模式。超过临界值后，面内塞曼场在相邻边界之间诱导出相反的有效狄拉克质量，导致每个角出现一个马约拉纳模态。类似的范例也适用于出现马约拉纳铰链状态的三维拓扑绝缘体。该方案避免了复杂的超导体配对和材料结构，为实现马约拉纳角态和铰链态提供了实验上可行的平台。
Second-order topological superconductors host Majorana corner and hinge modes in contrast to conventional edge and surface modes in two and three dimensions. However, the realization of such second-order corner modes usually demands unconventional superconducting pairing or complicated junctions or layered structures. Here we show that Majorana corner modes could be realized using a 2D quantum spin Hall insulator in proximity contact with an s-wave superconductor and subject to an in-plane Zeeman field. Beyond a critical value, the in-plane Zeeman field induces opposite effective Dirac masses between adjacent boundaries, leading to one Majorana mode at each corner. A similar paradigm also applies to 3D topological insulators with the emergence of Majorana hinge states. Avoiding complex superconductor pairing and material structure, our scheme provides an experimentally realistic platform for implementing Majorana corner and hinge states.