Topological semimetals such as Dirac, Weyl or nodal line semimetals are widely studied for their peculiar properties including high Fermi velocities, small effective masses and high magnetoresistance. When the Dirac cone is tilted, exotic phenomena could emerge whereas materials hosting such states are promising for photonics and plasmonics applications. Here we present evidence that SrAgBi is a spin-orbit coupling-induced type-II three-dimensional Dirac semimetal featuring tilted Dirac cone at the Fermi energy. Near charge compensation and Fermi surface characteristics are not much perturbed by 7% of vacancy defects on the Ag atomic site, suggesting that SrAgBi could be a material of interest for observation of robust optical and spintronic topological quantum phenomena.

狄拉克、外尔或节点线半金属等拓扑半金属因其高费米速度、小有效质量和高磁阻等特殊性质而被广泛研究。当狄拉克锥体倾斜时，可能会出现奇异现象，而具有这种状态的材料有望用于光子学和等离子体学应用。在这里，我们提出证据表明 SrAgBi 是一种自旋轨道耦合诱导的 II 型三维狄拉克半金属，在费米能量下具有倾斜的狄拉克锥。Ag 原子位点上 7% 的空位缺陷不会对近电荷补偿和费米表面特性造成太大干扰，这表明 SrAgBi 可能是一种用于观察稳健光学和自旋电子拓扑量子现象的感兴趣材料。