Inflated nodes and surface states in superconducting half-Heusler compounds
Inflated nodes and surface states in superconducting half-Heusler compounds
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DOI：
10.1103/physrevb.96.094526
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发表时间：
2017-07
影响因子：
3.7
通讯作者：
C. Timm;A. Schnyder;D. Agterberg;P. Brydon
中科院分区：
文献类型：
--
作者：
C. Timm;A. Schnyder;D. Agterberg;P. Brydon
半Heusler超导体如YPtBi是具有强自旋轨道耦合和破缺反转对称性的多轨道系统。自旋-轨道耦合允许形成有效自旋大于1的库珀对，这引入了新的配对状态。这些状态中的一些显示Bogoliubov准粒子的费米面。另一方面，反演对称性的缺乏导致与特定表面特征相关联的拓扑保护节点，例如，平坦带。作者考虑了这种材料的两种可能的配对对称性，一种打破了时间反演对称性，另一种没有，并发现了丰富的体节点和表面状态。
The half-Heusler superconductors such as YPtBi are multiorbital systems with both strong spin-orbit coupling and broken inversion symmetry. The spin-orbit coupling allows for the formation of Cooper pairs with effective spins larger than unity, which introduces novel pairing states. Some of these states display Fermi surfaces of Bogoliubov quasiparticles. On the other hand, the absence of inversion symmetry leads to topologically protected nodes associated with specific surface features as, for example, flat bands. The authors consider two likely pairing symmetries for this material, one that breaks time-reversal symmetry and one that does not, and find a rich variety of bulk nodes and surface states.