非么正Dirac和Weyl超导体的核自旋弛豫速率
Nuclear spin relaxation rate of nonunitary Dirac and Weyl superconductors
摘要：
非幺正超导作为一种新的无带隙相的物质，引起了人们的新的兴趣。本文研究了具有强自旋轨道相互作用的超导体中非幺正奇宇称手征配对态的超导能隙结构。通过应用离散旋转对称性对手征态的群论分类，我们根据节点的拓扑数和节点相对于旋转轴的位置将非幺正手征态中所有可能的点-节点能隙结构分为四种类型.除了传统的狄拉克和外尔点节点，我们确定了一种新的类型的狄拉克点节点独特的非幺正手征超导态。节点类型可以根据核磁共振纵向弛豫速率的温度依赖性通过实验确定。本文还讨论了我们的结果对UTe $_2$中奇宇称超导体的意义。
英文摘要：
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.
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