Topological indices, defects, and Majorana fermions in chiral superconductors

被引：62
作者：
Asahi, Daichi [1 ]
Nagaosa, Naoto [1 ,2 ,3 ]
机构：
[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan
[2] RIKEN, ASI, Cross Correlated Mat Res Grp, Wako, Saitama 3510198, Japan
[3] RIKEN, ASI, Correlated Electron Res Grp, Wako, Saitama 3510198, Japan
来源：
PHYSICAL REVIEW B | 2012年 / 86卷 / 10期
基金：
日本科学技术振兴机构;
关键词：
INSULATORS; SR2RUO4;
D O I：
10.1103/PhysRevB.86.100504
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We study theoretically the role of topological invariants to protect the Majorana fermions in a model of two-dimensional (2D) chiral superconductors which belong to class D of the topological periodic table. A rich phase diagram is revealed. Each phase is characterized by the topological invariants for 2D (Z) and 1D (Z(2)), which lead to the Majorana fermion at the edge dislocation and the core of the vortex. Interference of the Majorana fermions originating from the different topological invariants is studied. The stability of the Majorana fermion with respect to the interlayer coupling, i.e., in 3D, is also examined.
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页数：5
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