Topologically stable gapless phases in nonsymmorphic superconductors
Topologically stable gapless phases in nonsymmorphic superconductors
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DOI：
10.1103/physrevb.94.134512
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发表时间：
2015-03
影响因子：
3.7
通讯作者：
S. Kobayashi;Y. Yanase;M. Sato
中科院分区：
文献类型：
--
作者：
S. Kobayashi;Y. Yanase;M. Sato
研究了非对称超导体中节点的拓扑稳定性。特别是，我们证明了非对称奇宇称SC中的线节点受到拓扑结构和非对称对称性之间的相互作用的保护。作为一个例子，我们证明了${\mathrm{UPt}}_{3}$的${E}_{2u}$-超导态在布里渊区面处具有拓扑稳定的线节点。我们的理论表明，自旋轨道耦合的存在是必不可少的保护这样的线节点，补充诺曼的群论的论点。发展的拓扑参数，我们还提出了一个概括点节点和其他对称的情况下，超出了群论的参数。
We study the topological stability of nodes in nonsymmorphic superconductors (SCs). In particular, we demonstrate that line nodes in nonsymmorphic odd-parity SCs are protected by the interplay between topology and nonsymmorphic symmetry. As an example, it is shown that the ${E}_{2u}$-superconducting state of ${\mathrm{UPt}}_{3}$ hosts the topologically stable line node at the Brillouin zone face. Our theory indicates that the existence of spin-orbit coupling is essential for protecting such a line node, complementing Norman's group theory argument. Developing the topological arguments, we also propose a generalization to point nodes and to other symmetry cases beyond the group theory arguments.