Odd-Parity Topological Superconductors: Theory and Application to CuxBi2Se3
Odd-Parity Topological Superconductors: Theory and Application to CuxBi2Se3
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DOI：
10.1103/physrevlett.105.097001
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发表时间：
2010-08-23
影响因子：
8.6
通讯作者：
Berg, Erez
中科院分区：
文献类型：
--
作者：
Fu, Liang;Berg, Erez
拓扑超导体在体态和无间隙表面安德烈夫束缚态中具有完整的配对间隙。在这篇论文中，我们提供了在奇宇称对的中心对称超导体中实现时间逆不变拓扑超导体的充分判据。接下来，我们研究了新发现的超导体CuxBi(2)Se(3)在双轨模型中的配对对称性，并发现具有奇宇称的自旋-三重态配对受到强自旋-轨道耦合的青睐。基于我们的标准，我们提出CuxBi2Se3是一个很好的拓扑超导体候选者。最后，我们讨论了这个新拓扑相的实验特征。
Topological superconductors have a full pairing gap in the bulk and gapless surface Andreev bound states. In this Letter, we provide a sufficient criterion for realizing time-reversal-invariant topological superconductors in centrosymmetric superconductors with odd-parity pairing. We next study the pairing symmetry of the newly discovered superconductor CuxBi(2)Se(3) within a two-orbital model, and find that a novel spin-triplet pairing with odd parity is favored by strong spin-orbit coupling. Based on our criterion, we propose that CuxBi2Se3 is a good candidate for a topological superconductor. We close by discussing experimental signatures of this new topological phase.