论文标题
核自旋松弛速率的非民族狄拉克和Weyl超导体
Nuclear spin relaxation rate of nonunitary Dirac and Weyl superconductors
论文作者
论文摘要
单身超导性吸引了新的兴趣，这是一种新颖的物质阶段。在这项研究中，我们研究了涉及强旋转轨道相互作用的超导体中，在超导性手性配对状态下的超导差距结构。通过在离散旋转对称性方面应用手性状态的组理论分类，我们将非统一手性状态中的所有可能的点节点间隙结构分类为四种类型的节点和节点位置相对于旋转轴的拓扑数。除了常规的狄拉克和Weyl点节点外，我们还确定了一种新型的DIRAC点节点，这些节点是非单身手性超导状态的独特性。可以根据核磁共振纵向松弛率的温度依赖性在实验中识别节点类型。还讨论了我们的结果对UTE $ _2 $中非单身奇数超导体的含义。
Nonunitary superconductivity has attracted renewed interest as a novel gapless phase of matter. In this study, we investigate the superconducting gap structure of nonunitary odd-parity chiral pairing states in a superconductor involving strong spin-orbit interactions. By applying a group theoretical classification of chiral states in terms of discrete rotation symmetry, we categorized all possible point-nodal gap structures in nonunitary chiral states into four types in terms of the topological number of nodes and node positions relative to the rotation axis. In addition to conventional Dirac and Weyl point nodes, we identify a novel type of Dirac point node unique to nonunitary chiral superconducting states. The node type can be identified experimentally based on the temperature dependence of the nuclear magnetic resonance longitudinal relaxation rate. The implication of our results for a nonunitary odd-parity superconductor in UTe$_2$ is also discussed.
