Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan.
Phys Rev Lett. 2010 Aug 27;105(9):097002. doi: 10.1103/PhysRevLett.105.097002. Epub 2010 Aug 23.
We study edge states of noncentrosymmetric superconductors where spin-singlet d-wave pairing mixes with spin-triplet p (or f)-wave one by spin-orbit coupling. For d(xy)-wave pairing, the obtained Andreev bound state has an anomalous dispersion as compared to conventional helical edge modes. A unique topologically protected time-reversal invariant Majorana bound state appears at the edge. The charge conductance in the noncentrosymmetric superconductor junctions reflects the anomalous structures of the dispersions, particularly the time-reversal invariant Majorana bound state is manifested as a zero bias conductance peak.
我们研究了由自旋轨道耦合引起的非中心对称超导体中自旋单重态 d 波配对与自旋三重态 p（或 f）波配对的混合的边缘态。对于 d(xy)波配对，与传统的螺旋边缘模式相比，得到的安德烈夫束缚态具有异常色散。在边缘处出现独特的拓扑保护时间反演不变的马约拉纳束缚态。非中心对称超导体结中的电荷电导反映了色散的异常结构，特别是时间反演不变的马约拉纳束缚态表现为零偏压电导峰。
